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⚠ Pending professional review

This course plan, its lessons and its assessments has not yet been verified by a certified examiner or master technician in the trade or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Diesel & Heavy Truck

9 courses · 1,800 clock hours · 12 mo full-time. Grading is competency-based: each course requires the written exam, a competent skills demonstration with zero safety faults, a signed log, and a passed safety audit; percentage weights only rank performance above the competency floor.

~~$20,260~~ COMPLIMENTARYprogram tuition

9courses

79lessons

1,800hours

31assessments

Development progressPlanCourses, lessons and assessments written for this tradeLessons79 of 79 lesson pages writtenPractice632 practice questionsResources117 reference entries (study list)Review0 lesson pages reviewed by a licensed professional

Study now: 79 lesson pages are open (lesson titles below are links).

TRN-DIES20-01 Universal core

Universal Core: Safety, Math, Communication & Career for Diesel & Heavy Truck

148 hr · ~~$1,185~~ COMPLIMENTARY

This foundational course equips diesel and heavy-truck students with the safety knowledge, trade mathematics, technical literacy, and professional skills required before touching any equipment. Students earn OSHA 10-Hour General Industry or Construction card and First Aid/CPR certification, and build the numeracy and communication habits that underpin every subsequent course in the program.

Outcomes

Complete OSHA 10-Hour training and demonstrate compliance with lockout/tagout, PPE selection, and hazard communication (GHS/SDS) procedures specific to diesel shop environments.
Perform trade math calculations—including unit conversion, fractions, decimals, torque specification interpolation, and basic hydraulic/electrical formulas—to an accuracy of 90% or better.
Read and extract correct service data from OEM diesel service manuals, wiring diagrams, and OSHA/EPA compliance documents.
Use shop-standard digital tools (diagnostic tablet navigation, digital multimeter, electronic work order software) to locate, record, and communicate technical information.
Demonstrate professional workplace behaviors including punctuality, tool accountability, written work-order completion, and verbal communication with peers and supervisors.
Map personal career pathways to ASE T-series certification areas and OEM credentialing programs and identify the next steps required after program completion.

Course text

How the course runs. 7 blocks: Diesel Shop Safety: OSHA 10, Hazard Communication & PPE; First Aid, CPR & Emergency Response in the Heavy-Truck Shop; Trade Math I: Measurement, Fractions, Decimals & Unit Conversion; Trade Math II: Formulas, Ratios & Basic Electrical/Hydraulic Calculations; Technical Reading: Service Manuals, Wiring Diagrams & Regulatory Documents; Digital Tools & Work Orders: Diagnostic Tablets, Electronic Documentation & Shop Software; Career Readiness: Professional Behaviors, ASE & OEM Credentials, and Career Mapping.

What competent looks like. Complete OSHA 10-Hour training and demonstrate compliance with lockout/tagout, PPE selection, and hazard communication (GHS/SDS) procedures specific to diesel shop environments. Perform trade math calculations—including unit conversion, fractions, decimals, torque specification interpolation, and basic hydraulic/electrical formulas—to an accuracy of 90% or better. Read and extract correct service data from OEM diesel service manuals, wiring diagrams, and OSHA/EPA compliance documents. Use shop-standard digital tools (diagnostic tablet navigation, digital multimeter, electronic work order software) to locate, record, and communicate technical information. Demonstrate professional workplace behaviors including punctuality, tool accountability, written work-order completion, and verbal communication with peers and supervisors. Map personal career pathways to ASE T-series certification areas and OEM credentialing programs and identify the next steps required after program completion.

Lessons · 7 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Diesel Shop Safety: OSHA 10, Hazard Communication & PPE	28	theory	Students will correctly identify OSHA 10 hazard categories present in a diesel shop, select appropriate PPE for each, apply GHS/SDS procedures for diesel fuel, DEF, battery acid, and refrigerants, and demonstrate a lockout/tagout procedure on a simulated energy source.	Complete all 10 required OSHA 10-Hour General Industry modules (or Construction equivalent where appropriate) using the OSHA-authorized provider curriculum, recording completed topics in a personal safety log. SDS scavenger hunt: students locate SDS sheets for diesel fuel, engine oil, DEF, brake cleaner, and battery acid, then complete a worksheet identifying signal words, first-aid measures, and required PPE for each chemical. Lockout/tagout (LOTO) simulation: in pairs, students apply a six-step LOTO procedure to a de-energized shop engine stand using padlocks and hasp, then have the instructor verify isolation before the partner attempts to start—zero energy confirmed before sign-off.	OSHA 10-Hour authorized provider course materials; OSHA 29 CFR 1910.147 (LOTO) and 1910.1200 (HazCom) handouts; GHS-labeled shop chemical containers; actual SDS binder; PPE kit (safety glasses, face shield, nitrile and leather gloves, steel-toed boots, hearing protection); LOTO padlocks and hasp set; shop engine stand (de-energized).	OSHA 10 completion card issued by authorized provider (pass/fail per provider); LOTO skills checklist signed by instructor with all 6 steps correctly executed on first unassisted attempt (100% required—no partial credit on safety-critical steps); SDS worksheet score 80% or better.
2	First Aid, CPR & Emergency Response in the Heavy-Truck Shop	10	demo	Students will perform hands-only and full CPR, use an AED, control bleeding with direct pressure and tourniquet, and describe the emergency response chain specific to a diesel service shop, earning a recognized First Aid/CPR card.	Instructor-led demonstration of adult CPR and AED use on a manikin, followed by each student completing two minutes of uninterrupted chest compressions at the correct rate and depth as evaluated by the CPR manikin feedback device. Scenario drill: a classmate simulates an arm laceration from a metal burr; the responding student dons nitrile gloves, applies direct pressure, elevates the limb, and reports to the 'supervisor'—evaluated against a 6-point bleeding-control checklist. Shop emergency mapping: small groups walk the shop floor, identify the locations of all fire extinguishers (ABC and CO2 types), eyewash stations, AED, and emergency exits, then sketch a to-scale emergency response map they post and present.	Adult CPR manikins with feedback device; AED trainer unit; first-aid kit; tourniquet (CAT or equivalent); nitrile gloves; emergency response poster; shop floor plan (blank); measuring tape; American Red Cross or American Heart Association First Aid/CPR/AED course materials.	Recognized First Aid/CPR/AED certification card earned by completing provider's skills and written requirements (pass/fail per provider); bleeding-control checklist 6/6 correct steps; emergency map graded for accuracy—all safety stations located correctly (100% required).
3	Trade Math I: Measurement, Fractions, Decimals & Unit Conversion	22	theory	Students will convert between US customary and metric units of length, torque, pressure, volume, and temperature; perform fraction and decimal arithmetic; and read measurements from a micrometer, vernier caliper, and torque wrench to the correct precision.	Instructor demonstrates reading a 0–1 inch outside micrometer to 0.0001 inch; students then measure five machined steel pins of known dimension, recording readings on a data sheet and comparing to spec—instructor checks each reading before student moves to the next pin. Unit conversion relay: teams of three race to correctly convert a set of 20 shop-realistic values (e.g., 450 ft-lb to N·m, 15 PSI to kPa, 5 quarts to liters) using a reference conversion table, then check answers against an answer key and identify any errors. Torque specification interpolation worksheet: students read a torque table from a sample OEM engine manual, identify the correct fastener grade and size, convert the torque value to the unit shown on the available torque wrench, and set the wrench to that value—instructor verifies the wrench setting.	0–1 inch outside micrometer; 0–6 inch digital and vernier caliper; click-type torque wrench (50–250 ft-lb range); set of machined steel measurement pins; unit conversion reference card; sample OEM diesel engine manual (Cummins ISX or similar); student math workbook; calculators.	Math worksheet score 90% or better on 30-question assessment covering all unit types; all five micrometer readings within ±0.0001 inch of the known value; torque wrench setting verified by instructor as correct within the wrench's rated accuracy.
4	Trade Math II: Formulas, Ratios & Basic Electrical/Hydraulic Calculations	18	theory	Students will apply Ohm's Law (V=IR, P=IV) and basic hydraulic pressure–force–area relationships to solve shop-realistic problems, and correctly interpret gear ratio, compression ratio, and displacement calculations found in diesel service documentation.	Ohm's Law problem set: students solve 15 problems drawn from diesel electrical system scenarios (battery voltage drop, starter draw, circuit resistance), showing full work and circling the variable solved—peer-graded, then instructor-reviewed for misconceptions. Hydraulic lift scenario: given a shop press with a known cylinder bore and desired force, students calculate required hydraulic pressure using P = F/A, convert to PSI and bar, then verify their answer by checking the press's rated capacity plate. Gear ratio and displacement worksheet: using a sample transmission specification sheet and engine displacement formula (bore, stroke, number of cylinders), students calculate final drive ratio, engine displacement in liters and cubic inches, and compression ratio—results checked against manufacturer published values.	Student math workbook (Ohm's Law and hydraulic sections); scientific calculator; sample diesel wiring schematic (Cummins or PACCAR); shop hydraulic press with rating plate; sample automatic and manual transmission specification sheets; diesel engine displacement data sheet.	Combined Ohm's Law and hydraulic/ratio problem set: 90% or better on 20 problems; each student must show formula setup, substitution, and correct unit labeling—partial credit not awarded for answers without correct units.
5	Technical Reading: Service Manuals, Wiring Diagrams & Regulatory Documents	22	theory	Students will locate a specified torque value, component removal procedure, and fault code description in an OEM diesel service manual, correctly trace a circuit through a diesel wiring diagram, and identify the applicable regulatory sections in an OSHA or EPA compliance document.	Service manual navigation drill: each student receives a task card with three look-up tasks (e.g., 'Find the overhead valve lash specification for cylinder 1 on the assigned engine model,' 'Find the coolant fill procedure,' 'Find the fault code description for a specific active fault') and must locate all three within 20 minutes, recording the page and exact value. Wiring diagram trace: using a simplified diesel truck wiring diagram (charging circuit or starter circuit), students trace the circuit from battery positive to load and back to ground, marking each wire color, splice, connector number, and fuse rating on a blank diagram template—compared to an answer key. Regulatory document scavenger hunt: instructor provides excerpts from EPA diesel emissions regulations and an OSHA respiratory protection guidance document; students answer six comprehension questions identifying required actions, applicable equipment, and compliance deadlines using only the provided text.	OEM diesel engine service manual (Cummins or Caterpillar, current edition); diesel truck wiring diagram (OEM or instructor-developed); blank diagram template; EPA and OSHA regulatory document excerpts; task cards; highlighters; rulers.	Service manual drill: all three look-up tasks completed with correct values and page citations within 20 minutes (100% accuracy required—wrong values are a safety hazard); wiring diagram trace 90% of connections correctly identified; regulatory document questions 5/6 correct.
6	Digital Tools & Work Orders: Diagnostic Tablets, Electronic Documentation & Shop Software	24	lab	Students will navigate a diesel diagnostic software interface to retrieve vehicle information and read live data, complete a properly formatted electronic work order documenting a simulated service task, and locate a technical service bulletin (TSB) using an OEM or aftermarket information system.	Diagnostic tablet navigation: using a training-mode diagnostic tablet (e.g., Cummins INSITE, Cat ET, or equivalent available to the program), students connect to a shop engine and retrieve engine serial number, ECM part number, current fault codes, and one live data parameter (coolant temperature or engine speed)—results recorded on a data sheet. Electronic work order completion: instructor describes a simulated customer complaint (rough idle, coolant loss); student opens the shop's electronic work order system, enters customer and vehicle information, documents the complaint using correct 3C format (Concern, Cause, Correction), and attaches a parts list with correct part numbers from an electronic catalog. TSB retrieval exercise: each student is assigned a specific truck make, model year, and symptom; they use the OEM service information website or an aftermarket information system accessible to the school to locate a relevant TSB, print or screenshot it, and present the key findings (affected vehicles, required repair, parts needed) to a small group.	Diesel diagnostic tablet or laptop with diagnostic software (Cummins INSITE, Cat ET, or program-available equivalent) in training/demo mode; shop engine connected to diagnostic interface; electronic work order software (school's shop management system or demo version); electronic parts catalog access; OEM service information portal access or aftermarket equivalent; printer or screen-capture capability.	Diagnostic data sheet: all four data fields correctly recorded and matching actual ECM values (100%); work order graded on 10-point rubric (correct VIN entry, complaint in customer's words, cause stated, correction with labor description, parts listed with numbers)—8/10 required to pass; TSB presentation assessed by instructor on 4-point checklist (correct vehicle application, issue described, repair identified, parts identified)—4/4 required.
7	Career Readiness: Professional Behaviors, ASE & OEM Credentials, and Career Mapping	24	field	Students will demonstrate job-application skills specific to the diesel trade, explain the ASE T-series certification structure and OEM credentialing pathways (Cummins, Caterpillar), and produce a personal career development plan mapping program milestones to credential eligibility requirements.	Mock diesel technician job interview: each student participates in a 10-minute structured interview with an industry guest evaluator (diesel shop foreman or fleet manager where possible), responds to trade-specific behavioral questions (e.g., safety protocol situation, tool accountability scenario), and receives a scored rubric with written feedback. ASE and OEM credential research project: students use the ASE website and OEM training portals to document the T-series test areas, required work experience, registration process, and test format; they also compare requirements for at least one OEM program (Cummins or Cat) and present findings in a one-page comparison chart. Personal career development plan: using a provided template, each student maps their program courses to the ASE T-series content areas they address, identifies the work-experience hours they will accumulate through the externship, sets a target date for sitting their first ASE T-series test after graduation, and lists two OEM training steps they will pursue.	ASE website access (ase.com); Cummins QuickServe or Cummins Care training portal and/or Cat dealer training portal access; career development plan template; job interview rubric; industry guest evaluator (arranged by instructor); résumé template specific to diesel technician positions; sample diesel technician job postings.	Mock interview rubric: 70% or better across all categories (professional appearance, communication clarity, trade-relevant answers, demonstrated safety awareness); credential comparison chart evaluated for factual accuracy against ASE and OEM sources—3 of 4 credential elements correctly identified for each body; career development plan graded complete if all five sections filled with plausible, accurate, student-specific content—instructor signs off that credential pathway is realistic.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Safety & Regulatory Knowledge Exam	Written exam	25%	80% or better (24/30 questions correct); LOTO and GHS/SDS questions must be individually passed at 100%—any error on those two topic clusters requires remediation and retest before the student advances.	A 30-question written exam covering OSHA 10 content areas (hazard recognition, fall protection, electrical safety, PPE, fire prevention, materials handling), GHS labeling and SDS use, lockout/tagout steps, and first-aid response priorities as they apply specifically to diesel shop environments. Questions are scenario-based and use shop-realistic contexts (e.g., identifying the correct fire extinguisher class for a fuel fire, selecting PPE for working under a raised truck). Accuracy · Safety · Communication · Professionalism
Trade Math & Technical Reading Exam	Written exam	25%	90% or better (45/50 questions correct); any student scoring below 90% receives targeted tutoring and one retest opportunity within five school days.	A 50-question written exam integrating unit conversion, fraction and decimal arithmetic, Ohm's Law and hydraulic pressure calculations, gear/compression/displacement ratio problems, and service manual look-up tasks using an actual OEM manual provided during the exam. The look-up section requires students to locate specific values and record them with correct units, simulating real shop documentation tasks tied directly to ASE T-series prerequisite math skills. Accuracy · Safety · Communication · Professionalism
Digital Tools & Professional Documentation Portfolio	Project	25%	Rubric score of 80% or better across all four portfolio sections; any section scored below 70% must be revised and resubmitted within five school days.	Students assemble a four-part portfolio: (1) completed electronic work order with 3C documentation from the lab activity, (2) printed or screenshotted TSB with a one-paragraph summary in the student's own words, (3) diagnostic data sheet from the tablet navigation lab with all fields verified by the instructor's signature, and (4) the personal career development plan with ASE T-series course mapping and externship hour projection. The portfolio is graded on accuracy, completeness, and professional formatting. Accuracy · Safety · Communication · Professionalism
Career Readiness Oral Defense	Oral / panel	25%	70% or better on the 20-point oral rubric; students must score at least 3/5 on the trade-knowledge sub-category (ASE/OEM credential accuracy) or retest that section.	A 15-minute individual oral session before a two-person panel (instructor plus one industry or program advisory committee member where available) in which the student presents their career development plan, explains how the ASE T-series and OEM credentials differ and complement each other, responds to two impromptu safety scenario questions drawn at random from the OSHA 10 content areas covered in the course, and defends their projected timeline for credential attainment. The session is scored on a 20-point rubric covering content accuracy, communication clarity, professional demeanor, and credential pathway realism. Accuracy · Safety · Communication · Professionalism

TRN-DIES20-02 Trade course

Diesel Engines: Theory, Diagnosis, and Overhaul

205 hr · ~~$2,950~~ COMPLIMENTARY

Students develop a thorough understanding of four-stroke diesel engine principles, major system components, and the diagnostic reasoning used in heavy-truck service. Through progressive theory, demonstration, and hands-on lab work, students disassemble, inspect, measure, reassemble, and performance-test a diesel engine to industry standards. Lesson content maps directly to the ASE T-series (especially T2 – Diesel Engines) and supports factory-level knowledge required for Cummins and Caterpillar OEM certification pathways.

Outcomes

Explain the four-stroke diesel combustion cycle and describe how air management, fuel delivery, and compression interact to produce power.
Use precision measuring tools (micrometer, bore gauge, dial indicator) to measure engine components and compare results against OEM service-limit specifications.
Perform a systematic engine diagnosis using oil analysis data, compression/cylinder leak-down test results, and scan-tool data to identify root cause of failure.
Disassemble a diesel engine, clean and inspect all major components, and reassemble to OEM torque and clearance specifications.
Identify and correct unsafe conditions during engine service, including proper use of LOTO procedures, PPE, and hazardous-material handling per OSHA standards.
Document inspection findings, measurement data, and repair procedures in a professional written work order that meets shop quality-control standards.

Course text

How the course runs. 12 blocks: Diesel Engine Fundamentals and the Four-Stroke Cycle; Engine Block, Crankshaft, and Bearing Systems; Cylinder Head, Valvetrain, and Overhead Components; Precision Measurement and Engine Specification Work; Fuel Systems: Injection Principles and High-Pressure Common Rail; Air Management: Turbochargers, Aftercoolers, and EGR Systems; Engine Lubrication and Cooling Systems; Engine Diagnosis: Compression and Cylinder Leak-Down Testing; Electronic Engine Controls and Scan-Tool Diagnostics; Engine Overhaul: Disassembly and Inspection Procedures; Engine Overhaul: Reassembly, Torquing, and Adjustment; Engine Performance Verification and Work-Order Documentation.

What competent looks like. Explain the four-stroke diesel combustion cycle and describe how air management, fuel delivery, and compression interact to produce power. Use precision measuring tools (micrometer, bore gauge, dial indicator) to measure engine components and compare results against OEM service-limit specifications. Perform a systematic engine diagnosis using oil analysis data, compression/cylinder leak-down test results, and scan-tool data to identify root cause of failure. Disassemble a diesel engine, clean and inspect all major components, and reassemble to OEM torque and clearance specifications. Identify and correct unsafe conditions during engine service, including proper use of LOTO procedures, PPE, and hazardous-material handling per OSHA standards. Document inspection findings, measurement data, and repair procedures in a professional written work order that meets shop quality-control standards.

Lessons · 12 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Diesel Engine Fundamentals and the Four-Stroke Cycle	14	theory	Students will explain each stroke of the four-stroke diesel cycle and describe how compression ignition differs from spark ignition, achieving at least 80% on a written check.	Lecture and animated-diagram walkthrough of intake, compression, power, and exhaust strokes; students annotate a cutaway diagram labeling valve events and pressure peaks. Small-group comparison exercise: students list three measurable differences between a diesel and a gasoline engine (compression ratio, ignition method, fuel delivery) and present findings. Timed terminology quiz (20 terms) using flash-card software; pairs quiz each other, then instructor reviews missed items whole-class.	Whiteboard, diesel engine cutaway diagram (poster and digital), OEM engine technical manual (Cummins ISX or Cat C15 series), classroom projector, flash-card app (Quizlet or equivalent)	Written 20-question multiple-choice quiz on cycle events, terminology, and compression-ignition principles; pass = 80% or higher.
2	Engine Block, Crankshaft, and Bearing Systems	16	demo	Students will identify all major block and lower-end components, state their function, and describe the consequences of bearing clearance out of specification.	Instructor demonstration: disassemble lower end of a bench engine, naming each component and its material; students complete a labeled-parts worksheet as the demo proceeds. Students handle main bearing shells and crankshaft journals, identifying wear patterns (fatigue spalling, wiping, cavitation erosion) using a reference wear-pattern chart. Guided discussion: instructor presents three real-world failure scenarios (spun bearing, journal scoring, block crack) and students trace each failure back to likely root cause using the OEM service manual.	Bench diesel engine (teardown unit), main and rod bearing sets, crankshaft, OEM service manual, bearing wear-pattern reference chart, parts washer, nitrile gloves, safety glasses	Parts-identification checklist: students must correctly identify and state the function of 15 lower-end components; pass = 13 of 15 correct.
3	Cylinder Head, Valvetrain, and Overhead Components	16	demo	Students will describe the function of each cylinder-head and valvetrain component and explain how valve timing affects engine performance and emissions.	Instructor demonstrates cylinder head removal from a mounted engine, narrating torque-sequence procedure and head-gasket inspection criteria; students follow along in the OEM manual. Students trace rocker-arm geometry on a cutaway head, using a felt-tip marker on a transparency overlay to map oil-flow paths from cam to valve tip. Case-study worksheet: given a set of three symptom descriptions (excessive blowby, misfiring, high fuel consumption), students select the most likely valvetrain cause and cite the OEM specification that confirms or rules it out.	Cylinder head (removed, on bench stand), camshaft, rocker arms, pushrods, valve springs and keepers, OEM service manual, transparency overlays and markers, torque wrench	Instructor-observed oral identification of all valvetrain components with stated function; pass = student correctly identifies and explains 12 of 14 components without prompting.
4	Precision Measurement and Engine Specification Work	20	lab	Students will use outside micrometers, telescoping gauges, bore gauges, and dial indicators to measure engine components and correctly compare readings to OEM service limits.	Hands-on station rotation: each student measures crankshaft journal diameter (OD micrometer), cylinder bore diameter (telescoping gauge + micrometer), piston diameter, and ring-end gap at four stations with a partner checking readings. Students record all measurements on a standardized data sheet, calculate clearances (e.g., piston-to-wall, bearing oil clearance), and flag any component outside OEM service limits in red. Instructor-led debrief: students compare their measurements against known 'planted' out-of-spec components to verify they catch discrepancies; discuss rounding errors and proper micrometer technique.	0–1 inch and 1–2 inch outside micrometers, telescoping gauge set, dial bore gauge, dial indicator with magnetic base, feeler gauge set, OEM engine specification sheet, measurement data recording forms, calipers	All measurements on the data sheet are within ±0.001 inch of instructor's calibrated reference readings; student correctly identifies all out-of-spec components; pass = 90% of measurements within tolerance and all defects flagged.
5	Fuel Systems: Injection Principles and High-Pressure Common Rail	18	theory	Students will explain the operating principles of a high-pressure common-rail (HPCR) fuel system, identify its major components, and describe how fuel pressure, injection timing, and injection quantity are electronically controlled.	Lecture with system schematic: instructor traces fuel path from tank through lift pump, fuel-water separator, high-pressure pump, rail, and injector; students annotate a blank schematic. Video analysis: students watch a slow-motion injector operation video, then describe in writing the pilot, main, and post-injection events and their purpose (combustion quality, emissions, DPF regeneration). Pair exercise using OEM diagnostic manual: given a list of fault codes, students identify which codes relate to rail pressure, injector circuit, or fuel-quality concerns and describe one confirming test for each.	HPCR system schematic poster, cutaway injector (display unit), OEM electronic control system manual (Cummins or Cat), scan-tool simulator software or actual scan tool, projector, fuel-system fault-code reference list	Written 15-question quiz on HPCR components, pressure ranges, electronic control inputs, and failure modes; pass = 80% or higher.
6	Air Management: Turbochargers, Aftercoolers, and EGR Systems	16	demo	Students will identify turbocharger components, describe variable-geometry turbine (VGT) operation, and explain the role of charge-air cooling and exhaust gas recirculation in meeting emissions standards.	Instructor demonstration: remove and inspect a VGT turbocharger from a display engine, checking compressor-wheel play, vane movement, and oil-port condition; students record inspection findings on a checklist. Airflow mapping exercise: students use colored arrows on a large laminated engine diagram to trace air from the air filter through the compressor, aftercooler, EGR mixer, cylinders, turbine, and DPF. Small-group analysis: each group receives a set of boost pressure data and intake manifold temperature readings and must determine whether a turbocharger or aftercooler problem is indicated, citing acceptable ranges from the OEM spec sheet.	VGT turbocharger (removed display unit), air-management system diagram (laminated poster), colored dry-erase markers, OEM air-system specification sheet, boost pressure test kit, infrared thermometer	Component inspection checklist completed by each student is reviewed by instructor; student must correctly assess VGT vane movement as acceptable or not-acceptable using OEM criteria; pass = all critical inspection steps completed and correctly evaluated.
7	Engine Lubrication and Cooling Systems	14	theory	Students will describe the oil-flow path through a heavy-diesel lubrication system, explain cooling-system pressure and flow relationships, and state the consequences of inadequate lubrication or overheating.	Lecture with cross-section diagram: trace oil from sump through pump, filter, cooler, main gallery, rod and main bearings, cam bearings, and rocker arms; students complete a fill-in-the-blank flow diagram. Oil analysis interpretation exercise: instructor provides three oil analysis reports with abnormal values (high silicon, elevated iron, glycol contamination); students write a one-paragraph diagnosis and recommended action for each. Cooling-system pressure test demonstration on a bench-mounted system: instructor pressurizes the system with a hand pump, students identify the location of a planted leak and explain how a faulty pressure cap affects boiling point.	Engine lubrication diagram (poster), used oil analysis sample reports (three sets), cooling-system pressure test kit, bench-mounted cooling system mock-up, OEM lubrication and cooling specifications, nitrile gloves, safety glasses	Students submit written oil-analysis interpretations; each of the three reports must include correct identification of the contaminant and a specific, justified next action; pass = all three diagnoses correct and justified.
8	Engine Diagnosis: Compression and Cylinder Leak-Down Testing	18	lab	Students will perform compression tests and cylinder leak-down tests on a running diesel engine, record results, compare to OEM limits, and identify the location and probable cause of any cylinder sealing defect.	Pre-test safety briefing and LOTO demonstration; students install compression-test adapter, disable injectors per OEM procedure, crank engine, and record peak compression for all cylinders on a data sheet. Cylinder leak-down test: students pressurize each cylinder at TDC compression and measure leak-down percentage; using a stethoscope and air-escape location (intake, exhaust, crankcase, coolant), they identify probable defect (rings, valves, head gasket). Students complete a written diagnostic summary for the engine tested, listing cylinder-by-cylinder data, comparison to OEM limits, root-cause conclusion, and recommended repair action.	Diesel engine (mounted, running-capable), compression test adapter set (diesel-specific), cylinder leak-down tester, injector disable switch or OEM procedure, stethoscope, LOTO locks and tags, OEM compression specification, data recording forms, safety glasses, nitrile gloves	Instructor reviews data sheet and written summary; all compression readings recorded within ±5 psi of instructor's verified readings; defect correctly located and root cause correctly stated; pass = data accuracy 90% and correct diagnosis.
9	Electronic Engine Controls and Scan-Tool Diagnostics	16	lab	Students will connect a diesel scan tool to a heavy-truck engine control module (ECM), retrieve active and stored fault codes, interpret live-data PIDs, and use the data to support a diagnostic conclusion.	Instructor introduces J1939 data-link architecture and OBD connector pinout; students connect a scan tool to a truck or engine simulator, navigate to fault-code and live-data screens, and record all active and pending codes. Live-data analysis: instructor induces a known fault (e.g., sensor out-of-range) on the simulator; students monitor relevant PIDs, note the anomaly, and document their findings on a diagnostic worksheet. Students write a step-by-step diagnostic narrative for one fault code following a five-step diagnostic process: verify complaint, retrieve codes, gather data, isolate fault, confirm repair; instructor reviews logic and use of OEM electronic troubleshooting guide.	Heavy-truck diesel scan tool (or OEM diagnostic software on laptop), J1939 breakout box, engine ECM simulator or actual truck with planted faults, OEM electronic troubleshooting guide, diagnostic worksheets, USB or Bluetooth interface cable	Diagnostic worksheet reviewed by instructor; student must correctly retrieve all codes, correctly interpret at least two live PIDs, and produce a logical five-step diagnostic narrative; pass = all codes retrieved and narrative logically sound per OEM guide.
10	Engine Overhaul: Disassembly and Inspection Procedures	24	lab	Students will safely disassemble an assigned diesel engine to bare block, clean all components, perform a full visual and dimensional inspection, and document findings on a standardized overhaul worksheet.	Full disassembly lab: working in pairs, students disassemble a bench diesel engine following OEM disassembly sequence; all fasteners are organized in labeled trays; instructor circulates and verifies correct tool use and LOTO compliance. Parts cleaning and visual inspection: students clean components in the parts washer, then inspect each part for cracks, scoring, wear, and corrosion; they photograph significant defects and attach photos to the overhaul worksheet. Dimensional inspection: using skills from Lesson 4, students measure all critical components (journals, bores, piston diameters, end gaps) and record readings on the overhaul worksheet, marking each component as reuse, machine, or replace.	Bench diesel engine (teardown unit), engine stand, complete hand-tool set, torque wrench, parts washer with approved solvent, precision measuring tools (micrometer set, bore gauge, feeler gauges), OEM overhaul manual, overhaul data worksheet, labeled parts trays, LOTO locks and tags, safety glasses, nitrile gloves, hearing protection	Completed overhaul worksheet reviewed by instructor; all measured values within ±0.001 inch of reference and all defects correctly categorized (reuse/machine/replace) per OEM limits; pass = 90% measurement accuracy and correct disposition of all components.
11	Engine Overhaul: Reassembly, Torquing, and Adjustment	22	lab	Students will reassemble the diesel engine from bare block to fully assembled state using OEM torque specifications, sequence procedures, and final adjustments, producing an engine ready for start-up.	Students install new bearings, rings, and gaskets following OEM prep procedures (oil mains, check ring orientation and gap placement); instructor spot-checks critical steps before students proceed to the next stage. Torque-to-yield head bolt procedure: students apply thread lubricant per OEM spec, follow the torque sequence in stages, and complete angle-torque final pass using an angle torque adapter; instructor verifies final torque values. Valve adjustment and timing verification: students set valve lash to OEM specification using a feeler gauge and adjust injection timing (or verify timing marks) per OEM procedure; engine is barred over by hand and leak-checked before sign-off.	Engine assembled to bare block from Lesson 10, OEM bearing and gasket kit, ring compressor, torque wrench, angle torque adapter, feeler gauge set, thread lubricant (OEM specified type), OEM reassembly manual with torque specifications, valve adjustment worksheet, barring tool, safety glasses, nitrile gloves	Instructor performs a final walk-around inspection using a reassembly sign-off checklist; all torque values verified at a minimum of three critical points (head bolts, main caps, rod caps); valve lash within OEM tolerance; pass = all critical steps signed off and no oil or coolant leaks during hand-bar check.
12	Engine Performance Verification and Work-Order Documentation	11	field	Students will start up the reassembled or a designated truck engine, verify performance parameters against OEM specifications using a scan tool and basic instruments, and produce a complete, professional work order documenting all inspection, repair, and test findings.	Controlled start-up and warm-up: students follow OEM first-start procedure (prime oil system, check for leaks at idle, monitor oil pressure and coolant temperature); instructor supervises and students record all start-up readings on a checklist. Post-start performance check: students use the scan tool to verify no active codes, confirm oil pressure PID, coolant temperature PID, and fuel rail pressure at idle and under load (if shop dynamometer or road test is available). Work-order documentation: each student writes a complete repair order covering the complaint, cause, correction, and parts used in the standard C-C-C format; the work order includes all measurement data from the overhaul and performance test results, formatted per shop standards.	Diesel engine or truck (reassembled from Lesson 11 or designated shop vehicle), scan tool, oil pressure gauge, OEM performance specification sheet, shop work-order form (paper or shop-management software), safety glasses, fire extinguisher accessible, hearing protection	Instructor reviews completed work order against a 10-point rubric (complaint documented, all measurements recorded, parts listed, cause identified, correction described, performance results attached, legible, professional language, no safety omissions, correct format); pass = 8 of 10 rubric points met and engine shows no active fault codes at sign-off.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Diesel Engine Systems Knowledge Exam	Written exam	25%	75% or higher (38 of 50 questions correct)	A 50-question multiple-choice and short-answer written exam covering four-stroke cycle theory, fuel system principles, air management, lubrication, cooling, electronic controls, and diagnostic reasoning, mapped to ASE T2 (Diesel Engines) task list content areas. Students are allowed the OEM specification reference sheet for the measurement questions only; all other sections are closed-book. Standard met · Safety · Time · Quality/finish · Documentation
Engine Measurement and Diagnosis Skills Demonstration	Skills demonstration	45%	All critical steps performed correctly; all measurements within ±0.001 inch of instructor reference; diagnostic conclusion matches planted fault	Each student individually measures a set of engine components using micrometers, bore gauges, and a dial indicator, records results on a data sheet, and performs a cylinder leak-down test on an engine with one planted defect; the student must state the defect location and probable cause verbally to the instructor. This assessment maps directly to ASE T2 task areas covering engine measurement and diagnosis. Standard met · Safety · Time · Quality/finish · Documentation
Engine Overhaul Lab Log	Log	15%	Lab log receives a score of 80% or higher on the 20-point rubric (minimum 16 points)	Students submit a compiled lab log covering Lessons 10 and 11 that includes all disassembly notes, photographic documentation of defects, a complete dimensional data sheet with OEM comparisons and component dispositions, reassembly torque records, and a reflection paragraph describing one decision made during reassembly and its technical justification. The log is evaluated for accuracy, completeness, and professional format. Standard met · Safety · Time · Quality/finish · Documentation
Shop Safety and Hazardous-Material Handling Check	Safety audit	15%	Zero critical safety errors; all PPE and LOTO steps performed without prompting; pass/fail (any critical error = immediate fail and remediation required)	The instructor observes each student perform a complete LOTO sequence on the bench engine, don appropriate PPE for a high-pressure fuel-system task, and demonstrate proper disposal of used oil and spent solvent in labeled containers per shop hazardous-waste procedures. This check is conducted at the start of the overhaul lab sequence (Lesson 10) and must be passed before the student is permitted to proceed with disassembly. Standard met · Safety · Time · Quality/finish · Documentation

TRN-DIES20-03 Trade course

Air Brakes: Systems, Service, and Compliance

205 hr · ~~$2,950~~ COMPLIMENTARY

Students learn the theory, inspection, adjustment, diagnosis, and repair of full air brake systems as installed on commercial motor vehicles, including S-cam drum, disc, and air-over-hydraulic configurations. Instruction follows FMCSA inspection standards, ASE T-series brake content areas, and manufacturer service procedures for tractor-trailer, straight truck, and bus applications. Safety, federal compliance, and hands-on brake adjustment are emphasized throughout.

Outcomes

Explain how compressed air is generated, conditioned, stored, and distributed through a dual-circuit air brake system, identifying all major components and their functions.
Perform a pre-trip air brake inspection and operational check that satisfies FMCSA out-of-service criteria, documenting findings on a standard inspection report.
Adjust foundation brakes (S-cam drum and automatic slack adjusters) to manufacturer specification using correct tools, and verify adjustment with a pushrod travel measurement.
Diagnose air brake system faults—including air leaks, slow build-up, dragging brakes, and ABS fault codes—using shop air, soapy water, a pressure gauge, and a scan tool, and complete a repair order.
Replace or resurface brake drums, shoes, and hardware, and inspect/replace brake chambers, spring brakes, and air lines to OEM specifications, following lockout/tagout and spring-brake caging procedures.
Interpret federal brake regulations and ASE T4 task-list requirements to verify that a completed brake job meets both legal and industry credential standards.

Course text

How the course runs. 12 blocks: Air Brake Fundamentals and Federal Regulations; Air Supply System: Compressors, Governors, Dryers, and Tanks; Dual-Circuit Brake Valves: Treadle, Relay, and Quick-Release Valves; Spring Brakes, Parking Brakes, and Trailer Supply; Foundation Brakes: S-Cam Drum Brake Components and Operation; Brake Adjustment: Manual and Automatic Slack Adjusters; Pre-Trip Air Brake Inspection and Operational Tests; Air Leak Diagnosis and Line/Fitting Repair; Anti-Lock Braking Systems (ABS) and Electronic Stability Control; Air-Over-Hydraulic Brake Systems; Brake Chamber, Diaphragm, and Hardware Replacement; ASE T4 Brake System Review and Capstone Brake Inspection.

What competent looks like. Explain how compressed air is generated, conditioned, stored, and distributed through a dual-circuit air brake system, identifying all major components and their functions. Perform a pre-trip air brake inspection and operational check that satisfies FMCSA out-of-service criteria, documenting findings on a standard inspection report. Adjust foundation brakes (S-cam drum and automatic slack adjusters) to manufacturer specification using correct tools, and verify adjustment with a pushrod travel measurement. Diagnose air brake system faults—including air leaks, slow build-up, dragging brakes, and ABS fault codes—using shop air, soapy water, a pressure gauge, and a scan tool, and complete a repair order. Replace or resurface brake drums, shoes, and hardware, and inspect/replace brake chambers, spring brakes, and air lines to OEM specifications, following lockout/tagout and spring-brake caging procedures. Interpret federal brake regulations and ASE T4 task-list requirements to verify that a completed brake job meets both legal and industry credential standards.

Lessons · 12 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Air Brake Fundamentals and Federal Regulations	14	theory	Students will explain how compressed air multiplies force to stop a heavy vehicle and identify the federal regulations—FMCSA Part 393 and Part 396—that govern air brake systems and inspections.	Lecture and annotated diagram exercise: trace airflow from the compressor through each circuit to the brake chamber, labeling components on a cutaway poster and a digital schematic. Regulation scavenger hunt: students locate specific out-of-service criteria in a printed FMCSA reference and answer a 15-question worksheet comparing legal limits to example measurements. Group discussion using a case-study accident report involving brake failure; students identify which regulation was violated and which component failed.	FMCSA Parts 393 and 396 (printed excerpts), TMC Recommended Practice manuals, dual-circuit air brake system wall chart, whiteboard, projector, student workbooks	10-question end-of-lesson quiz on system layout and regulatory limits; pass mark 70%
2	Air Supply System: Compressors, Governors, Dryers, and Tanks	18	demo	Students will describe the function of the compressor, governor, air dryer, and wet/dry tanks, and demonstrate how to drain tanks and test governor cut-in and cut-out pressures.	Instructor-led bench demonstration of a disassembled single-cylinder compressor: students identify pistons, valves, and unloading mechanism, then sketch and label parts. Hands-on tank drain procedure on a training trailer: each student drains all reservoirs, observes moisture content, and records findings on a shop form. Governor pressure test using a calibrated gauge at the test port; students record cut-in and cut-out readings and compare to the specification range, flagging any out-of-spec result.	Training tractor-trailer, shop air supply, calibrated 0-200 psi test gauge, disassembled compressor bench unit, air dryer cutaway, tank drain valves, PPE (safety glasses, gloves), shop forms	Student correctly drains tanks and records governor pressures within ±2 psi of accepted range; instructor observation checklist, 100% steps completed
3	Dual-Circuit Brake Valves: Treadle, Relay, and Quick-Release Valves	16	theory	Students will explain how the foot treadle valve simultaneously controls primary and secondary circuits and trace signal air and delivery air through relay valves and quick-release valves to each axle.	Cutaway valve identification stations: students rotate through four bench stations (treadle, relay, quick-release, double-check), completing a labeled diagram at each station. Animated simulation walkthrough on the shop computer: instructor projects a valve-actuation animation; students predict pressure values at each point before the animation reveals them. Small-group schematic exercise: teams receive a blank dual-circuit schematic and must correctly place and connect all valve symbols, then compare to the answer key.	Cutaway treadle valve, relay valve, quick-release valve, double-check valve (bench-mounted), dual-circuit schematic worksheets, laptop with air brake animation software, overhead projector	Completed and correctly labeled schematic scored against answer key; 80% accuracy required
4	Spring Brakes, Parking Brakes, and Trailer Supply	18	demo	Students will explain the fail-safe operation of spring brakes and safely cage and uncage a spring brake chamber following manufacturer caging procedures before any disassembly.	Instructor demonstration of spring brake caging procedure on a removed type-30/30 piggyback chamber, narrating each step of the caging bolt installation and verifying spring compression before handling. Students practice caging and uncaging chambers in pairs under direct supervision; instructor confirms caging bolt is fully engaged and chamber is safe before the student proceeds. Trailer supply valve and glad-hand exercise: students couple and uncouple air lines on a training trailer, identify glad-hand color coding (blue/red), and verify trailer spring brake application and release by listening and observing pushrod retraction.	Type-30/30 spring brake chambers (bench-mounted), caging bolt tools, glad-hand connectors, training trailer, PPE (face shield, heavy gloves), OEM spring brake service manual, lockout/tagout kit	Instructor signs off spring-brake caging competency card; student must complete all caging steps in correct sequence with no coaching—binary pass/fail
5	Foundation Brakes: S-Cam Drum Brake Components and Operation	20	lab	Students will disassemble an S-cam foundation brake assembly, measure drum diameter, lining thickness, and cam-bore wear, and determine serviceability against published specifications.	Complete brake disassembly on a training axle: remove wheel, hub, drum, shoes, and hardware; students photograph each stage for their lab log before removing the next component. Dimensional inspection: each student measures drum diameter with an inside brake drum micrometer, lining thickness with a lining gauge, and cam-bore diameter with a bore gauge, recording all measurements on a lab data sheet. Serviceability determination: students compare their measurements to the OEM specification table and write a parts decision (reuse, regrind, or replace) with justification for each component.	Training axle with S-cam brake assembly, inside brake drum micrometer, lining thickness gauge, bore gauge set, torque wrench, brake spoon, PPE (gloves, safety glasses, dust respirator), OEM brake service manual, lab data sheets, camera or smartphone	Lab data sheet with all measurements recorded and serviceability calls correct within ±0.005 in. of instructor measurement; 90% measurement accuracy required
6	Brake Adjustment: Manual and Automatic Slack Adjusters	20	lab	Students will adjust manual slack adjusters and inspect automatic slack adjusters (ASAs) to achieve pushrod travel within the legal limit for the chamber size, verifying with a ruler measurement at 90 psi application.	Measurement of pushrod travel before adjustment: students apply brakes at 90 psi using the treadle on a training vehicle, mark pushrod position with chalk, measure travel with a ruler, and record result against the FMCSA limit for the chamber type. Manual adjustment exercise: students back off locking collars, turn adjuster clockwise until shoes drag, then back off the specified number of turns, re-measure, and repeat until pushrod travel is within specification. ASA inspection and verification: students stroke each ASA-equipped chamber, confirm the ASA does not free-wheel when stroked by hand (indicating internal pawl engagement), and check for corrosion, damage, and proper clevis pin installation.	Training tractor-trailer with mixed manual and ASA-equipped axles, ruler or tape measure, chalk, 0-150 psi gauge, brake application tool, FMCSA pushrod travel limit chart, wrenches, PPE	All pushrod travel measurements at or below FMCSA legal limit for chamber type after student adjustment; instructor re-measures two randomly selected chambers—both must be in spec
7	Pre-Trip Air Brake Inspection and Operational Tests	20	practice	Students will perform a complete CDL-standard pre-trip air brake inspection and operational test sequence from memory, identifying any defects and correctly classifying them as out-of-service or not.	Instructor models the full pre-trip inspection sequence on a training tractor-trailer using a step-by-step card; students narrate back each step in their own words to a partner. Timed solo pre-trip: each student performs the full sequence (low-pressure warning test, pressure build-up timing, governor cut-out, leak-down test, parking brake hold test, service brake test) while an instructor observes and records deviations on a checklist. Seeded-defect exercise: instructor pre-sets three defects on the training vehicle (e.g., broken slack adjuster, cracked air line, missing cotter pin); students perform inspection and must identify all three defects and correctly call out-of-service status.	Training tractor-trailer, stopwatch, 0-150 psi dash gauge, pre-trip inspection checklist (FMCSA format), defect cards, PPE, flashlight	Student completes full inspection sequence with no missed required steps and correctly identifies all seeded defects; pass requires zero missed required steps and 100% defect identification
8	Air Leak Diagnosis and Line/Fitting Repair	18	lab	Students will locate air leaks using soapy water and/or an ultrasonic leak detector, determine whether leak rate exceeds the legal limit, and repair or replace the leaking component to restore the system to specification.	Leak-down test: students build system pressure to governor cut-out, hold brakes off, and time pressure drop for one minute; repeat with brakes applied; compare to FMCSA allowable drop limits and record pass/fail. Soapy water inspection of all fittings, chamber diaphragms, lines, and valve bodies on a vehicle seeded with five artificial leaks; students mark each leak location with tape, identify the component, and estimate severity. Line repair exercise: students cut and re-flare a nylon air line, install push-to-connect DOT-approved fittings, pressurize the repaired section to system pressure, and verify zero leakage with soapy water before returning to service.	Training tractor-trailer, soapy water spray bottle, ultrasonic leak detector (if available), stopwatch, nylon air line stock (DOT-approved), push-to-connect fittings, flaring tool, wrenches, FMCSA leak-rate chart, PPE	Student locates at least 4 of 5 seeded leaks and completes one line repair that holds pressure with no visible bubbles; instructor verifies repair before vehicle is returned to service
9	Anti-Lock Braking Systems (ABS) and Electronic Stability Control	16	theory	Students will explain how wheel-speed sensors, modulators, and the ABS ECU prevent wheel lockup, and retrieve and interpret ABS diagnostic trouble codes using a commercial vehicle scan tool.	Lecture with component display: instructor presents a bench-mounted ABS modulator and wheel-speed sensor ring; students trace the signal path from sensor to ECU to modulator on a wiring diagram. Scan tool lab: students connect a commercial vehicle scan tool (e.g., Jpro or Nexiq) to a training vehicle, navigate to the ABS module, read active and stored DTCs, and record code descriptions using the scan tool's built-in help or a code chart. Fault simulation exercise: instructor introduces a simulated open-circuit wheel-speed sensor fault; students use a digital multimeter to measure sensor resistance and air gap, compare to specification, and write a diagnosis and repair recommendation on a repair order form.	Training tractor-trailer with ABS, commercial vehicle scan tool (Jpro or equivalent), bench-mounted ABS modulator and sensor, digital multimeter, wiring diagrams, ABS DTC reference chart, repair order forms, PPE	Student correctly identifies the fault code, traces it to the correct sensor, measures resistance within ±10% of spec, and completes a repair order with correct cause and correction; 80% accuracy on written repair order
10	Air-Over-Hydraulic Brake Systems	14	demo	Students will describe the components and operation of an air-over-hydraulic (AOH) brake system and identify how air pressure converts to hydraulic line pressure through the master cylinder booster.	Cutaway demonstration: instructor shows an AOH booster/master cylinder assembly, identifies the air inlet, control valve, and hydraulic piston, and explains pressure multiplication ratio using a calculation example on the whiteboard. System trace on a training medium-duty truck equipped with AOH: students follow air lines from the foot valve to the booster and hydraulic lines to each wheel cylinder, labeling a blank schematic as they walk the vehicle. Bleeding procedure demonstration: instructor demonstrates correct sequence for bleeding hydraulic lines on an AOH system; students observe, note differences from a pure hydraulic system, and answer a short written question set.	Medium-duty training truck with AOH brakes, cutaway AOH booster/master cylinder, blank AOH schematic worksheets, hydraulic line wrenches, bleeder kit, clean brake fluid, drain pan, PPE (goggles, chemical-resistant gloves), OEM AOH service manual	Completed and correctly labeled AOH schematic scored at 80% or higher against answer key
11	Brake Chamber, Diaphragm, and Hardware Replacement	18	lab	Students will remove and replace a service brake chamber and a piggyback spring brake chamber following lockout/tagout and spring-brake caging procedures, and torque all fasteners to specification.	Pre-job safety briefing and lockout/tagout setup: students chock wheels, cage spring brakes on all rear axles using caging bolts, depressurize the system, and attach lockout tags before touching any chamber. Chamber replacement: each student removes a designated service chamber, inspects the mounting bracket and clevis, installs a new chamber, connects air lines, and torques mounting nuts to OEM specification with a torque wrench. Post-installation functional test: student repressurizes system, applies and releases service brakes three times, checks for air leaks at new fittings with soapy water, measures pushrod travel, and completes a post-repair inspection form.	Training tractor-trailer, replacement brake chambers (service and piggyback types), caging bolts, wrenches, torque wrench, soapy water, ruler, PPE (face shield, heavy gloves), lockout/tagout kit, OEM specification torque chart, post-repair inspection forms	Instructor verifies correct spring-brake caging before work begins (binary gate), correct torque on all fasteners confirmed with torque wrench, zero leaks on post-repair soap test, and pushrod travel within FMCSA limit
12	ASE T4 Brake System Review and Capstone Brake Inspection	13	practice	Students will complete a comprehensive brake system inspection and repair order on an unknown-condition training vehicle, mapping findings to ASE T4 task areas and FMCSA out-of-service criteria.	ASE T4 task-list review: instructor leads a rapid-fire Q&A covering all T4 brake task areas using flashcards and a projected task list; students identify which tasks they find most challenging and complete a targeted practice worksheet on those areas. Full vehicle brake inspection: working individually, students inspect an unknown-condition training vehicle (compressor, valves, lines, chambers, slack adjusters, foundations, drums, linings, ABS) and document every finding on a standardized repair order using correct trade terminology. Debrief and credential mapping: students review completed repair orders with the instructor, who maps each finding to the relevant ASE T4 task area and FMCSA regulation, and students self-score against the ASE task list to identify remaining study gaps.	Training tractor-trailer in unknown condition, ASE T4 task list (current edition), FMCSA out-of-service criteria reference, standardized repair order forms, all inspection tools from prior lessons, PPE	Repair order includes findings for every major system area; student correctly classifies out-of-service conditions with 90% accuracy compared to instructor master list

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Air Brake Systems Written Exam	Written exam	25%	75% or higher (scored by item; students below 75% receive targeted remediation and one retest)	A 60-question multiple-choice and short-answer exam covering air brake theory, federal regulations, component identification, operational limits, ABS operation, and diagnostic reasoning, mapped to ASE T4 brake task areas. Questions are drawn from all lesson topics and require application of knowledge to realistic vehicle scenarios. Standard met · Safety · Time · Quality/finish · Documentation
Brake Adjustment and Chamber Replacement Skills Demo	Skills demonstration	45%	All critical safety steps (spring-brake caging, lockout/tagout) completed correctly before any disassembly; all pushrod travel measurements within FMCSA legal limits; all torque specifications met—binary fail on any safety step, 90% on all other checklist items	Each student is observed by an instructor performing a complete brake adjustment on a training axle and replacing one brake chamber on the training trailer; the instructor completes a standardized competency checklist in real time. Students must demonstrate correct spring-brake caging independently before the practical task begins. Standard met · Safety · Time · Quality/finish · Documentation
Lab Log Portfolio	Log	15%	Eight of eleven lab/practice lessons documented with complete data, correct serviceability calls, and signed instructor verification; any lab with fabricated data receives a zero and must be repeated	Students maintain a lab log throughout the course containing completed data sheets, measurements, repair orders, and photographs from every lab and practice lesson. The portfolio is reviewed at mid-term and at course end to verify that all measurements are recorded to the correct precision and all repair decisions are supported by specification references. Standard met · Safety · Time · Quality/finish · Documentation
Pre-Trip Air Brake Safety Inspection Check	Safety audit	15%	Zero missed required inspection steps; 100% correct classification of all seeded defects as out-of-service or not; any failure in spring-brake caging or lockout/tagout protocol is an automatic fail and requires repeat of Lesson 4 before re-examination	Each student independently performs the full CDL pre-trip air brake inspection and operational test sequence on a training vehicle that has been seeded with a set of defects by the instructor; the student must identify and correctly classify each defect using FMCSA out-of-service criteria. This check is administered as a terminal safety gate: students who do not pass cannot advance to the Hydraulics course until they demonstrate competency. Standard met · Safety · Time · Quality/finish · Documentation

TRN-DIES20-04 Trade course

Hydraulics for Heavy Trucks and Diesel Equipment

204 hr · ~~$2,940~~ COMPLIMENTARY

This course covers the theory, diagnosis, and repair of hydraulic systems used in heavy trucks and diesel-powered equipment, including open- and closed-center circuits, pumps, control valves, cylinders, motors, and fluid conditioning components. Students perform hands-on bench and live-vehicle lab work tracing circuits, testing pressures and flows, and replacing or repairing components to manufacturer specifications. Content maps directly to ASE T-series exam areas covering brakes, suspension, and auxiliary hydraulic systems, and supports OEM Cummins/Cat certification objectives related to hydraulic system service.

Outcomes

Identify and explain the function of each component in open-center, closed-center, and load-sensing hydraulic circuits used on heavy trucks and construction equipment.
Use pressure gauges, flow meters, and temperature tools to diagnose hydraulic system faults and record findings in a standard service document.
Remove, inspect, repair or replace hydraulic pumps, cylinders, directional control valves, and filtration components following manufacturer torque and cleanliness specifications.
Safely handle, sample, and dispose of hydraulic fluid in compliance with OSHA hazard communication standards and shop environmental procedures.
Trace and interpret hydraulic schematics using ISO symbols to predict circuit behavior and locate faults.
Apply lockout/tagout and stored-energy control procedures before any hydraulic system service to eliminate injury from pressurized fluid or uncontrolled component movement.

Course text

How the course runs. 12 blocks: Hydraulic Fundamentals: Pascal's Law, Units, and System Overview; Hydraulic Fluids: Properties, Selection, Contamination, and Safe Handling; Lockout/Tagout and Stored-Energy Control for Hydraulic Systems; Hydraulic Pumps: Gear, Vane, and Piston Types; Hydraulic Schematics and ISO Symbols; Directional Control Valves, Relief Valves, and Circuit Control; Hydraulic Cylinders: Types, Seals, and Reconditioning; Hydraulic Motors and Final Drives; Filtration, Reservoirs, Heat Exchangers, and Accumulators; Pressure and Flow Testing: Diagnosis Procedure; Heavy-Truck and Equipment Hydraulic Systems: Steering, Lift, and PTO Circuits; Hydraulic System Repair Documentation, Environmental Compliance, and Career Connections.

What competent looks like. Identify and explain the function of each component in open-center, closed-center, and load-sensing hydraulic circuits used on heavy trucks and construction equipment. Use pressure gauges, flow meters, and temperature tools to diagnose hydraulic system faults and record findings in a standard service document. Remove, inspect, repair or replace hydraulic pumps, cylinders, directional control valves, and filtration components following manufacturer torque and cleanliness specifications. Safely handle, sample, and dispose of hydraulic fluid in compliance with OSHA hazard communication standards and shop environmental procedures. Trace and interpret hydraulic schematics using ISO symbols to predict circuit behavior and locate faults. Apply lockout/tagout and stored-energy control procedures before any hydraulic system service to eliminate injury from pressurized fluid or uncontrolled component movement.

Lessons · 12 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Hydraulic Fundamentals: Pascal's Law, Units, and System Overview	14	theory	Students will correctly state Pascal's Law and calculate force, pressure, and area in hydraulic circuit problems with at least 80% accuracy.	Lecture and whiteboard demonstration of Pascal's Law; students solve a worksheet of 20 force-pressure-area problems using F = P × A and unit conversions (psi, bar, GPM, in³/rev). Identify and label a large color poster of a complete heavy-truck hydraulic system (dump-body circuit), writing the function of each component in their own words. Group discussion comparing hydraulic, pneumatic, and mechanical power transmission: students list three trade-offs for each on a shared whiteboard and defend their answers.	Whiteboard, Pascal's Law worksheet, heavy-truck hydraulic system poster, Bosch Rexroth or Parker Hannifin hydraulics textbook, scientific calculators	Score of 16/20 (80%) or better on the force-pressure-area worksheet; instructor reviews answers as a class before moving on.
2	Hydraulic Fluids: Properties, Selection, Contamination, and Safe Handling	12	theory	Students will select the correct fluid type for a given OEM specification and describe two contamination control practices, demonstrating compliance with OSHA Hazard Communication (HazCom) requirements.	Read and discuss SDS sheets for three common hydraulic fluids (petroleum-based AW, biodegradable ester, and fire-resistant HF type); students complete a comparison chart of viscosity, flash point, and disposal method. Instructor demonstrates a fluid cleanliness particle count test using a portable patch-test kit; students record NAS or ISO cleanliness class results and compare to OEM maximum allowable levels. Role-play a fluid spill scenario: students locate the shop spill kit, don appropriate PPE (nitrile gloves, safety glasses, apron), contain a simulated spill with absorbent, and complete the shop's environmental incident log.	SDS sheets for three fluid types, portable patch-test contamination kit, PPE (gloves, glasses, apron), shop spill kit, environmental incident log form, OEM fluid specification sheets	Completed fluid comparison chart with correct viscosity and disposal data; spill scenario performed without safety error (instructor checklist with zero critical errors allowed).
3	Lockout/Tagout and Stored-Energy Control for Hydraulic Systems	10	demo	Students will perform a complete OSHA-compliant lockout/tagout and stored-energy bleed procedure on a hydraulic trainer before any pressurized work, with zero critical safety steps omitted.	Instructor demonstrates the full LOTO sequence on the bench hydraulic trainer (shut down, isolate, lock, tag, release stored pressure by cycling the control valve, verify zero-energy state with a gauge); students narrate each step back to the instructor. Students perform the LOTO sequence individually on the trainer while a partner observes using a written checklist; roles are then swapped. Class reviews three industry case studies of hydraulic injection injuries and pinch-point fatalities; students write a one-paragraph risk assessment for a dump-truck cylinder replacement job.	Bench hydraulic trainer, LOTO locks and tags (one set per student), pressure gauge, OSHA 29 CFR 1910.147 reference card, injury case study handouts, LOTO checklist form	Each student completes the LOTO checklist with 100% of critical steps correct (no errors permitted on this safety-critical lesson); any missed step requires immediate re-demonstration and recheck.
4	Hydraulic Pumps: Gear, Vane, and Piston Types	18	demo	Students will disassemble and reassemble a gear pump and identify wear patterns that require replacement, matching instructor findings with at least 80% accuracy.	Instructor bench-demonstrates disassembly of a gear pump, vane pump, and axial-piston pump, narrating the function and typical wear pattern of each component; students label a cross-section diagram for each type. Students measure pump gear end-play and housing bore with inside micrometer and feeler gauge, recording results against the manufacturer's service limit table. Students reassemble a gear pump on the bench using proper torque sequence (torque wrench to spec), install it on the trainer, start the circuit, and verify no-load outlet pressure is within 10% of rated spec.	Disassembly pumps (gear, vane, piston — one of each for class), bench hydraulic trainer, inside micrometers, feeler gauges, torque wrench, manufacturer service manuals, pump cross-section diagrams	Pump reassembly produces no-load pressure within 10% of rated spec on the trainer; wear-pattern identification matches instructor key for at least 4 of 5 labeled components.
5	Hydraulic Schematics and ISO Symbols	14	theory	Students will correctly read a five-component hydraulic schematic using ISO 1219 symbols and trace fluid flow through each operating position with no more than one symbol error.	Instructor presents an ISO symbol reference card; students practice drawing and labeling ten common symbols (pump, motor, cylinder, directional valve, relief valve, check valve, filter, accumulator, pressure gauge, reservoir). Students receive three schematics of increasing complexity (lift circuit, steering circuit, and a dual-circuit truck schematic) and trace flow paths in two operating positions on each, using colored pencils for supply and return. Schematic scavenger hunt: instructor marks six fault conditions on a projected schematic (valve stuck, line blocked, filter bypassed, etc.) and teams compete to identify each fault and name the symptom it would produce.	ISO 1219 symbol reference cards, printed schematics (three levels), colored pencils, projector, Parker or Eaton hydraulic schematic workbook, marker board	Students correctly label 9 of 10 symbols on a cold-call symbol quiz and trace flow paths on the intermediate schematic with no more than one error; instructor spot-checks individual work.
6	Directional Control Valves, Relief Valves, and Circuit Control	18	demo	Students will adjust system relief pressure to a specified setpoint and verify the setting with a calibrated gauge, demonstrating proper procedure with no more than ±50 psi deviation from the target.	Instructor disassembles a 4/3 directional control valve (tandem-center spool) and a direct-acting relief valve; students identify spool lands, springs, and seals, and discuss the effect of spool position on circuit flow. Students adjust the bench trainer's system relief valve in 200 psi increments from 500 psi to 2,500 psi, reading gauge pressure at each step and recording results in a data table; they plot pressure vs. adjuster turns on graph paper. Students configure the bench trainer for a two-position cylinder extend/retract circuit using a manually operated directional valve and demonstrate smooth bi-directional cylinder travel to the instructor.	Bench hydraulic trainer, disassembly directional control valve and relief valve, calibrated pressure gauge (glycerin-filled), adjustment tools, graph paper, data recording sheet, manufacturer valve specifications	Relief valve setpoint is within ±50 psi of the 2,000 psi target (instructor verifies with calibrated gauge); cylinder circuit operates without cavitation noise or external leakage.
7	Hydraulic Cylinders: Types, Seals, and Reconditioning	18	lab	Students will remove, inspect, reseal, and reinstall a double-acting hydraulic cylinder, verifying zero external leakage under load at the conclusion of the lab.	Instructor demonstrates safe cylinder removal from the bench trainer using LOTO, then bench-clamps the cylinder and disassembles it, narrating seal nomenclature (rod seal, wiper, O-ring, backup ring, piston seal) and noting any scoring on the barrel bore. Students measure the cylinder rod diameter with an outside micrometer, check rod straightness with a straightedge and feeler gauge, hone the barrel to manufacturer specification using a ball hone, and install a new seal kit following OEM assembly lube instructions. Students reinstall the cylinder on the trainer, cycle it 10 times under load (using a weighted sled or adjustable counterbalance), and inspect for any external leakage at the rod seal and port fittings; results are logged on the lab report form.	Bench hydraulic trainer with double-acting cylinder, LOTO kit, bench clamp/vise, outside micrometer, straightedge, feeler gauge, ball hone, cylinder seal kit, assembly lubricant, torque wrench, lab report form	Zero external leakage after 10 load cycles (visual inspection); lab report completed with all measurements recorded; rod seal and piston seal installed in correct orientation (instructor verifies during assembly).
8	Hydraulic Motors and Final Drives	14	demo	Students will calculate the theoretical output torque and speed of a hydraulic motor given displacement, pressure, and flow inputs, and verify actual motor speed on the trainer within 10% of the calculated value.	Instructor explains gear, vane, and bent-axis piston motor construction; students complete a comparison chart of torque, speed range, and typical application for each type on heavy trucks and construction equipment. Students apply the formula T = (P × D) / (2π) and N = (Q × 231) / D to calculate expected torque and RPM for the bench trainer motor at three flow/pressure combinations, recording work on calculation sheets. Students connect the motor to the trainer circuit, measure actual output speed with a digital contact tachometer at each flow setting, and compare to calculated values; deviations greater than 10% trigger a leak-down check on pump volumetric efficiency.	Bench hydraulic trainer with gear motor, digital contact tachometer, flow meter, pressure gauges, calculation worksheets, hydraulics textbook, hydraulic motor specification sheet	All three calculated RPM values within 10% of tachometer readings; calculation sheets show correct formula application with units labeled (instructor reviews each sheet).
9	Filtration, Reservoirs, Heat Exchangers, and Accumulators	12	lab	Students will service the filtration and conditioning components on the bench trainer — replacing a return-line filter, bleeding an accumulator to safe pre-charge pressure, and verifying reservoir fluid level and condition — following all LOTO and PPE requirements.	Students perform LOTO on the bench trainer, then remove and cut open a used return-line filter element, inspect the filter media for contamination type (metallic, rubber, fiber), and record findings on an inspection sheet linked to possible fault sources. Using a nitrogen charging kit, students check the accumulator gas pre-charge pressure (bladder type), compare it to the OEM specification, and add nitrogen as needed; class discusses why compressed air or oxygen must never be used in this application. Students drain a portion of the reservoir fluid into a sampling bottle, seal it, label it per lab chain-of-custody procedure, and complete a mock fluid analysis work order specifying which tests to run and what results would trigger a fluid change.	Bench hydraulic trainer, LOTO kit, PPE, filter cutter, used filter elements, nitrogen charging kit, accumulator (bladder type), fluid sampling bottles, chain-of-custody labels, mock fluid analysis work order form	Accumulator pre-charge within OEM specification range (instructor checks with gauge); no fluid leaks after filter replacement; contamination inspection sheet completed with three possible fault sources identified.
10	Pressure and Flow Testing: Diagnosis Procedure	20	lab	Students will follow a structured diagnostic procedure to isolate a seeded hydraulic fault on the bench trainer, correctly identifying the faulty component and citing supporting test data in a written service diagnosis.	Instructor introduces the 'start upstream, test downstream' diagnostic strategy; students practice a five-step pressure-flow test sequence on a healthy trainer to establish baseline readings, recording results in a diagnostic log. Instructor seeds one of four hidden faults (worn pump, stuck relief valve, bypassing cylinder, restricted filter) on the trainer without telling the student; student conducts the full diagnostic sequence, makes a written diagnosis, and recommends a repair. Students present their diagnostic findings to the class in a two-minute verbal report, citing specific gauge readings and flow meter data; class votes on whether the diagnosis is supported by the data before the instructor reveals the actual fault.	Bench hydraulic trainer with four pre-seeded fault sets, calibrated pressure gauges (two), in-line flow meter, temperature gun, diagnostic log forms, stopwatch, technical service manual excerpts	Correct identification of the seeded fault with supporting data cited; diagnostic log complete with all test-point readings; verbal report clearly links data to conclusion (instructor evaluates using a 10-point rubric, 8/10 to pass).
11	Heavy-Truck and Equipment Hydraulic Systems: Steering, Lift, and PTO Circuits	22	field	Students will perform a systematic operational check and service inspection of a full heavy-truck hydraulic system — including power steering, a hoist or lift circuit, and a PTO-driven auxiliary circuit — documenting findings on a manufacturer inspection form.	In pairs, students conduct a pre-service walk-around inspection of an in-shop heavy truck or dump trailer, checking reservoir level, hose and fitting condition, cylinder rod cleanliness, and labeling any observed leaks or damage on a vehicle diagram. Students perform a power-steering system pressure test using a power-steering analyzer (pressure gauge with shutoff valve), comparing readings to OEM specifications for relief pressure and maximum flow restriction at idle and rated RPM. Students operate the truck's hoist circuit under a safely staged partial load (or simulated load per instructor setup), timing the raise and lower cycle and comparing to OEM cycle time specification; they complete the manufacturer inspection form and recommend service actions.	In-shop heavy truck or dump trailer with operational hoist and power steering, power-steering analyzer kit, stopwatch, OEM inspection form, vehicle service manual, PPE (steel-toed boots, gloves, safety glasses), wheel chocks and safety stands	Inspection form fully completed with all test values recorded; power-steering pressure reading within OEM spec or fault correctly documented; instructor observes safe work habits throughout (zero PPE or LOTO violations permitted).
12	Hydraulic System Repair Documentation, Environmental Compliance, and Career Connections	32	practice	Students will write a complete repair order for a hydraulic system job — including labor description, parts list, fluid disposal notation, and customer-ready explanation — and correctly categorize used hydraulic fluid for disposal under applicable federal environmental guidelines.	Students use a shop management software simulation (or paper repair order) to write up a hydraulic cylinder reseal job performed in Lesson 7, listing all parts by OEM part number, labor time in tenths of an hour, and disposal line item for used fluid; instructor reviews for completeness. Guest speaker (working fleet hydraulic technician or service manager) presents a 30-minute talk on career pathways, typical service calls, and how ASE T-series certification affects hiring and wages; students prepare three job-interview questions and conduct a mock Q&A. Class reviews EPA used-oil management guidelines and shop environmental compliance poster; students sort a set of scenario cards (used hydraulic fluid, contaminated filter elements, spilled fluid on absorbent, empty seal kit packaging) into correct disposal categories and explain their reasoning.	Shop management software or paper repair order forms, OEM parts catalog, EPA used-oil management reference card, disposal scenario cards, guest speaker, whiteboard for Q&A, ASE T-series exam area outline	Repair order includes all required fields and a correct disposal line item (instructor uses a 12-point checklist, 10/12 to pass); correct categorization of at least 4 of 5 disposal scenario cards.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Hydraulics Written Knowledge Exam	Written exam	25%	75% or higher (30 of 40 questions correct)	A 40-question multiple-choice and short-answer exam covering Pascal's Law calculations, ISO schematic symbols, component identification, fluid properties, circuit types, and diagnostic interpretation, mapped to ASE T-series brake and auxiliary hydraulic system exam areas. Students must score 75% or higher to pass; those below 75% complete targeted review and sit one retake. Standard met · Safety · Time · Quality/finish · Documentation
Hydraulic Fault Diagnosis and Component Repair Skills Demonstration	Skills demonstration	45%	Achieve 'satisfactory' on all six rubric categories; any 'unsatisfactory' rating requires remediation and re-demo	The instructor seeds a fault in the bench hydraulic trainer; the student performs a full LOTO sequence, conducts a structured pressure-flow diagnostic, identifies the fault, performs the specified repair (pump replacement, cylinder reseal, or valve adjustment as assigned), and verifies the repair by returning the system to specification — all within a two-hour time limit. The rubric evaluates safety compliance, diagnostic process, tool use, repair quality, system verification, and documentation, with any safety violation resulting in automatic failure. Standard met · Safety · Time · Quality/finish · Documentation
Hydraulics Lab Log	Log	15%	80% of entries rated 'complete and accurate' by instructor; any entry with a missing safety step must be corrected before the log is accepted	Students maintain a chronological lab log throughout the course, recording objective, procedure, measured data, equipment used, and a brief conclusion for every lab and demo lesson (Lessons 4 through 11). Each entry must include a safety compliance note describing LOTO or PPE actions taken; the completed log is submitted at the end of the course and evaluated for accuracy, completeness, and professional presentation. Standard met · Safety · Time · Quality/finish · Documentation
Hydraulic Safety Compliance Check	Safety audit	15%	100% of critical safety behaviors demonstrated correctly; any critical failure requires immediate remediation and a full re-check before the student may continue unsupervised lab work	A structured observation checklist administered by the instructor during Lesson 11 (field inspection lesson) evaluates each student on nine critical behaviors: donning correct PPE before any hydraulic work, performing a complete LOTO sequence with stored-pressure bleed and gauge verification, using wheel chocks and safety stands correctly, handling hydraulic fluid spills per the shop environmental procedure, and never directing a pressurized leak stream toward any person. All nine behaviors must be demonstrated correctly for the student to pass; this check is a program completion gate. Standard met · Safety · Time · Quality/finish · Documentation

TRN-DIES20-05 Trade course

Heavy Truck Electrical Systems

204 hr · ~~$2,940~~ COMPLIMENTARY

This course covers the theory, diagnosis, and repair of 12-volt and 24-volt electrical systems found on Class 6–8 diesel trucks, including charging, starting, lighting, datalink networks, and electronic control modules. Students use digital multimeters, oscilloscopes, and OEM diagnostic software to locate and correct faults following industry-standard wiring diagrams. Lesson content is mapped to ASE T-series Electrical/Electronic Systems exam areas and supports Cummins/Cat electronic troubleshooting certification objectives.

Outcomes

Interpret heavy-truck wiring diagrams and schematics to trace circuits, identify components, and locate faults without supervision.
Use a digital multimeter and lab-scope to perform voltage, resistance, voltage-drop, and waveform tests on starting, charging, and lighting circuits, meeting manufacturer specifications.
Diagnose and repair faults in J1939/CAN datalink networks and retrieve, interpret, and clear diagnostic trouble codes using OEM and standard diagnostic software.
Inspect, test, and service batteries, series-parallel battery banks, alternators, and starter motors, documenting results on standardized repair orders.
Troubleshoot and repair cab lighting, trailer wiring, ABS/wheel-speed sensor circuits, and electronic control module inputs and outputs safely and accurately.
Apply lockout/tagout, high-energy electrical PPE, and proper hazardous-material procedures throughout all electrical service tasks, passing every safety verification with zero critical errors.

Course text

How the course runs. 12 blocks: Electrical Safety, PPE, and Shop Protocols for Heavy Truck Work; Electrical Fundamentals: Ohm's Law, Circuit Types, and Wiring Diagrams; Test Equipment: DMM, Clamp Meter, and Lab Oscilloscope; Battery Systems: Testing, Maintenance, and Service; Starting Systems: Theory, Circuit Testing, and Diagnosis; Charging Systems: Alternator Output, Regulation, and Diagnosis; Lighting Systems: Federal Requirements, Circuits, and Troubleshooting; Multiplexing and J1939 CAN Datalink Networks; Electronic Control Modules: Inputs, Outputs, and ECM Diagnosis; ABS, Wheel-Speed Sensors, and Trailer ABS Circuits; Cab Electronics, Instrumentation, and Body Electrical Systems; Electrical Systems Comprehensive Diagnosis Capstone Lab.

What competent looks like. Interpret heavy-truck wiring diagrams and schematics to trace circuits, identify components, and locate faults without supervision. Use a digital multimeter and lab-scope to perform voltage, resistance, voltage-drop, and waveform tests on starting, charging, and lighting circuits, meeting manufacturer specifications. Diagnose and repair faults in J1939/CAN datalink networks and retrieve, interpret, and clear diagnostic trouble codes using OEM and standard diagnostic software. Inspect, test, and service batteries, series-parallel battery banks, alternators, and starter motors, documenting results on standardized repair orders. Troubleshoot and repair cab lighting, trailer wiring, ABS/wheel-speed sensor circuits, and electronic control module inputs and outputs safely and accurately. Apply lockout/tagout, high-energy electrical PPE, and proper hazardous-material procedures throughout all electrical service tasks, passing every safety verification with zero critical errors.

Lessons · 12 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Electrical Safety, PPE, and Shop Protocols for Heavy Truck Work	12	theory	Students will identify the specific electrical hazards present in heavy-truck shops, select correct PPE, and execute lockout/tagout procedures for high-amperage vehicle systems without error.	Instructor-led presentation on arc-flash risk from high-capacity battery banks, hydrogen gas from charging batteries, and high-voltage hybrid/diesel-electric components; students complete a written hazard-identification worksheet for a shop floor diagram. Hands-on LOTO exercise: each student disconnects a truck battery bank following a written LOTO procedure, applies personal locks, verifies zero energy with a DMM, and re-energizes in reverse order while an instructor evaluates each step against a checklist. Small-group scenario drill: students respond to a simulated electrical burn, locate the eyewash station and fire extinguisher, and demonstrate first-aid steps for electrical shock, documenting the sequence on an incident report form.	OSHA 29 CFR 1910.147 lockout/tagout reference, shop LOTO procedure cards, class B and C fire extinguishers, eyewash station, rubber insulating gloves (rated for voltage level in use), face shield, OSHA 10 student guide, digital multimeter (Fluke 87V or equivalent), heavy-truck shop safety poster set	Instructor-scored LOTO checklist and hazard-ID worksheet; student must achieve 100% on the LOTO checklist (zero critical errors) and 80% or better on the written worksheet to advance.
2	Electrical Fundamentals: Ohm's Law, Circuit Types, and Wiring Diagrams	18	theory	Students will apply Ohm's Law and Kirchhoff's voltage and current laws to series, parallel, and series-parallel circuits, and correctly read a heavy-truck OEM wiring diagram to identify circuit paths, splice locations, and connector codes.	Lecture and whiteboard worked examples covering voltage, current, resistance, and power calculations; students complete a 20-problem practice set using realistic truck circuit values (e.g., 12 V starter draw, 24 V charging systems) and self-check against an answer key. Wiring-diagram reading exercise using Kenworth or Freightliner cab wiring diagrams (OEM service information system): students trace the headlamp circuit from battery positive through fuse block, switch, and ground, annotating wire gauges, color codes, and connector reference numbers on a printed diagram. Circuit-type identification lab using a pre-wired training board: students connect series, parallel, and series-parallel resistor networks, predict values using Ohm's Law, then verify with a DMM, recording predicted vs. measured values in a data table.	Whiteboard and markers, Ohm's Law reference cards, printed heavy-truck OEM wiring diagrams (Kenworth T680 or Freightliner Cascadia sample pages), pre-wired training boards with resistor arrays, digital multimeters, scientific calculators, student electrical theory workbook	20-problem calculation set scored by instructor; wiring-diagram annotation reviewed for correct circuit path, component IDs, and connector codes. Pass mark: 80% on calculation set and all five required diagram elements identified correctly.
3	Test Equipment: DMM, Clamp Meter, and Lab Oscilloscope	14	demo	Students will correctly set up and use a digital multimeter, clamp-on ammeter, and automotive lab oscilloscope to measure DC and AC voltage, current, resistance, frequency, and waveform shape on running truck circuits.	Instructor demonstration: proper DMM lead insertion for each measurement mode, safe ranging, and reading auto-ranging meters; students mirror the setup on their own meter and practice measuring known resistors, a battery, and a running alternator output, recording results on a measurement log. Clamp-meter exercise: students clamp an amp probe around individual battery cables on a running truck to measure starter inrush current during a no-load crank test and compare readings to specification in the service manual. Lab-scope introduction: instructor demonstrates capturing an alternator AC ripple waveform and a wheel-speed sensor signal; students connect the scope, capture both waveforms, adjust time-base and voltage scale to display at least two full cycles, and sketch waveforms with labeled amplitude and period in their lab log.	Fluke 87V DMMs (one per student pair), Fluke 376 or equivalent clamp-on ammeter, Pico Automotive Oscilloscope or equivalent with breakout leads, running diesel truck or engine trainer, OEM specifications sheet for alternator ripple and sensor signals, student lab log booklets	Instructor observes and scores each measurement: correct meter mode selected, leads/clamps connected safely, value within ±5% of instructor-measured reference, and reading recorded with correct unit. Students must pass all four measurement types (voltage, current, resistance, waveform) to receive credit for this lesson.
4	Battery Systems: Testing, Maintenance, and Service	18	lab	Students will perform a complete battery system service—state-of-charge test, conductance test, load test, cable inspection, and electrolyte service—on a heavy-truck series-parallel battery bank, correctly identifying any battery that fails specification.	Pre-work lecture on battery chemistry, group sizes common to Class 8 trucks, series and series-parallel wiring to achieve 12 V or 24 V system voltage, and cold-cranking amp ratings; students diagram a four-battery 12 V series-parallel bank on paper showing current paths during cranking and charging. Battery service lab: wearing face shield and acid-resistant gloves, students use a digital battery conductance tester (Midtronics GR8 or equivalent) and a load tester to test each cell of a truck battery bank, record CCA-measured vs. rated, specific gravity (if serviceable type) or conductance percentage, and make a pass/fail determination per manufacturer criteria. Cable and terminal service: students remove and clean corroded battery terminals using baking-soda solution and wire brush, inspect cables for chafing and heat damage, torque terminals to spec with an inch-pound torque wrench, and apply anti-corrosion felt washers and spray, documenting work on a repair order form.	Class 8 truck or battery service trainer, Midtronics GR8 or equivalent conductance tester, carbon-pile load tester, hydrometer, inch-pound torque wrench, baking soda solution, wire brush set, terminal puller, anti-corrosion spray and felt washers, face shields, acid-resistant gloves, aprons, repair order forms, OEM battery specification sheets	Instructor reviews completed repair order for accurate test readings, correct pass/fail determination against spec, and documentation of all service steps. Lab log entry reviewed for diagram accuracy. Pass mark: all test values recorded correctly, pass/fail determination matches instructor's reference result, repair order complete—85% overall score.
5	Starting Systems: Theory, Circuit Testing, and Diagnosis	18	lab	Students will diagnose a no-crank or slow-crank complaint on a heavy-truck starting circuit by performing voltage-drop tests on cables, the solenoid, and ground paths, and correctly identify the root-cause fault.	Theory segment: instructor covers starter motor construction (series-wound DC motor, solenoid, overrunning clutch), starting circuit layout from battery positive through main cable, solenoid battery terminal, solenoid motor terminal, starter motor, and ground return; students trace the circuit on a wiring diagram and label each test point where a voltage-drop measurement would be taken. Voltage-drop lab on a running truck with each test point accessible: students crank the engine and measure voltage drop across the positive cable, solenoid contacts, motor ground strap, and engine block-to-chassis strap using a DMM set to millivolt scale; compare readings to the standard threshold (typically 0.5 V maximum per segment) and record in lab log. Fault-finding exercise: instructor pre-loads one of three faults (high-resistance ground strap, corroded solenoid contact, undersized jumper cable); student teams diagnose using voltage-drop tests only, write a fault report identifying the failed component, and explain the repair procedure to the class.	Class 6–8 truck or starting-system trainer with seeded faults, Fluke 87V DMMs, clamp-on ammeter, wiring diagrams, inch-pound and foot-pound torque wrenches, OEM starting-system specification sheet, lab log booklets, fault report forms	Instructor scores voltage-drop data table for correct test points and values within ±0.1 V of instructor reference. Fault report evaluated for correct root-cause identification and plausible repair procedure. Pass mark: all voltage-drop test points recorded correctly and fault identified correctly—80% combined.
6	Charging Systems: Alternator Output, Regulation, and Diagnosis	18	lab	Students will test a heavy-truck alternator for rated output voltage, current output, AC ripple, and voltage-drop across the charging circuit, interpreting results against OEM specifications to determine alternator serviceability.	Theory and demonstration: instructor explains delta and wye stator windings, three-phase rectification, and internal vs. external voltage regulation; students label a cutaway alternator diagram with component names and describe what a failed diode or open stator phase would do to output. Charging output test: with the truck running at specified RPM and a carbon-pile or variable load applied, students measure alternator output voltage (regulated range typically 13.8–14.5 V for 12 V systems), current output vs. rated amperage, and AC ripple voltage using a DMM AC setting; record all values on a data sheet. Charging circuit voltage-drop test: students measure drop from alternator output terminal to battery positive and from alternator case ground to battery negative while at full load; compare to specification (typically under 0.5 V each side) and document findings on a repair order, including a recommendation to repair, replace, or approve.	Running diesel truck or charging-system trainer, Fluke 87V DMM, clamp-on ammeter, carbon-pile or variable load tester, lab oscilloscope for ripple verification, cutaway alternator display, OEM charging-system specification sheet, repair order forms, lab log booklets	Data sheet reviewed for all required measurements with correct units; pass/fail recommendation must match instructor's reference determination. Repair order must document all measurements and a clear recommendation. Pass mark: 85% of data points within ±5% of reference and correct pass/fail recommendation.
7	Lighting Systems: Federal Requirements, Circuits, and Troubleshooting	16	lab	Students will verify that a Class 8 tractor-trailer combination meets Federal Motor Carrier Safety Administration lighting requirements and diagnose and repair two seeded faults in the lighting circuit using wiring diagrams and a DMM.	Pre-lab review of FMCSA lighting regulations applicable to commercial motor vehicles (headlamps, clearance lamps, marker lamps, stop/tail/turn lamps, conspicuity tape placement) and the 7-pin SAE J560 trailer connector pinout; students complete a quick reference card from memory and verify against the standard. Lighting inspection walk-around: students walk around a Class 8 combination unit with a checklist and identify any non-functional lamps, damaged lenses, or missing reflectors; document findings on a DOT-style pre-trip lighting checklist and determine which items would place the vehicle out of service. Fault-diagnosis lab: instructor pre-seeds two lighting faults (e.g., open ground on tail lamp circuit, corroded 7-pin connector pin); students use a wiring diagram to identify circuit path, perform voltage and continuity tests to isolate the fault, repair it, and verify correct lamp operation; document diagnosis and repair on a repair order.	Class 8 tractor-trailer unit with seeded faults, SAE J560 7-pin connector reference card, FMCSA lighting requirement summary, DOT pre-trip lighting checklist, wiring diagrams, DMMs, 7-pin breakout box, wire stripper/crimper, heat-shrink butt connectors, repair order forms	Pre-trip checklist completeness and accuracy scored against instructor reference; both seeded faults must be correctly diagnosed and repaired with verification lamp function restored. Repair order reviewed for diagnostic logic and documented verification. Pass mark: all out-of-service items identified and both faults correctly repaired—85%.
8	Multiplexing and J1939 CAN Datalink Networks	18	theory	Students will explain how J1939 CAN datalink architecture routes messages between ECMs on a heavy truck and use a digital multimeter and diagnostic scan tool to verify network resistance, identify a failed module, and read live data parameters.	Lecture on multiplexing advantages, CAN bus physical layer (twisted-pair differential signal, 120-ohm terminating resistors, backbone vs. stub topology), and J1939 message structure (PGN, SPN, source address); students label a printed network topology diagram for a Freightliner Cascadia with engine, transmission, ABS, and body controller modules identified. Network resistance test: with all ECMs disconnected from power (LOTO applied to battery), students measure resistance across the CAN High and CAN Low data lines at the diagnostic connector; expected value with two terminators in parallel is approximately 60 ohms; students record results and determine if the network passes or fails the bench test. Live data exercise using a Cummins Insite or Caterpillar ET session on a running truck: students navigate to the parameter list, record engine speed, coolant temperature, boost pressure, and accelerator pedal position in a data table, then request a simulated fault code, read the SPN/FMI, look up the fault in the OEM diagnostic manual, and describe the first diagnostic step.	Freightliner Cascadia or Peterbilt 579 training truck, printed J1939 network topology diagram, DMM, Cummins Insite or Cat ET diagnostic laptop with interface cable (RP1210-compliant), OEM diagnostic trouble code manual, CAN bus reference chart, student theory workbook	Network topology diagram annotation reviewed for correct module identification. Resistance measurement within ±5 ohms of expected value with correct pass/fail determination. Live data table complete with correct parameter labels and units; SPN/FMI lookup result verified by instructor. Pass mark: 80% across all three activities.
9	Electronic Control Modules: Inputs, Outputs, and ECM Diagnosis	18	lab	Students will use a breakout T-harness and a DMM or lab scope to test ECM sensor inputs (analog and digital) and actuator outputs on a diesel engine control system, correctly distinguishing a sensor fault from a wiring fault from an ECM fault.	Theory segment: ECM architecture overview—analog sensor inputs (coolant temp, oil pressure: variable voltage), digital/frequency inputs (camshaft and crankshaft position: Hall effect/reluctor wheel), and switched outputs (injector drivers, solenoid valves); students complete a matching exercise pairing ten named sensors to their signal type and typical voltage range. Sensor input test lab: with a breakout T-harness installed between the ECM connector and the engine harness, students measure reference voltage (typically 5 V), sensor return (ground quality), and signal voltage for two sensors (e.g., intake air temperature and fuel rail pressure) at idle and high idle, recording results against OEM spec ranges. Seeded-fault diagnosis: instructor introduces one fault (e.g., an open in the 5 V reference wire shared by multiple sensors causing multiple DTCs); students retrieve DTCs, analyze which sensors share the reference circuit on the wiring diagram, measure reference voltage at each sensor, isolate the open, repair with a butt-splice, and clear codes to verify repair.	Diesel engine trainer or truck with Cummins ISX or Cat C15 (or current equivalent), OEM breakout T-harness for ECM connector, DMM, lab oscilloscope, Cummins Insite or Cat ET diagnostic software, OEM wiring diagrams and sensor specification sheets, wire stripper, heat-shrink connectors, repair order forms	Sensor measurement data sheet reviewed for correct values with units; fault-diagnosis repair order must show correct DTC retrieval, circuit analysis on diagram, measurement-based fault isolation, repair description, and code-clear verification. Pass mark: all sensor values within spec range and fault correctly identified and repaired—85%.
10	ABS, Wheel-Speed Sensors, and Trailer ABS Circuits	16	lab	Students will test passive (variable reluctance) and active (Hall effect) wheel-speed sensors using a DMM and lab scope, interpret sensor waveforms for correct frequency and amplitude, and retrieve and interpret ABS diagnostic trouble codes using a scan tool.	Theory and waveform identification: instructor shows oscilloscope captures of a good VR sensor waveform (sinusoidal, amplitude varies with speed) and a good Hall-effect sensor waveform (square wave, constant amplitude); students identify which waveform type corresponds to each sensor technology and list two conditions that would distort each waveform. Wheel-speed sensor static test: students measure resistance of a VR sensor (compare to OEM spec, typically 900–2,000 ohms for common truck sensors), check for shorts to ground, and with the wheel rotated by hand, verify AC voltage output on the DMM; then on an active sensor, measure supply voltage, ground return, and signal voltage with a DMM. ABS scan tool session: using a Bendix ABS or Meritor WABCO-compatible scan tool or software on a truck with at least one seeded ABS code, students retrieve all active and stored DTCs, identify the affected wheel-end circuit, verify the sensor air gap against OEM specification using a feeler gauge, and document findings and recommended repair on a repair order.	Class 8 tractor with ABS (Bendix or Meritor WABCO), passive and active wheel-speed sensors (bench samples), DMM, lab oscilloscope, feeler gauge set, Bendix ACSLink or WABCO Toolbox diagnostic software with laptop and RP1210 cable, OEM ABS wiring diagram and sensor specification sheet, repair order forms	Waveform identification quiz scored immediately (pass = 100% correct identification of both sensor types). Sensor resistance measurement within ±10% of reference. ABS DTC retrieval, air gap measurement, and repair recommendation evaluated on repair order. Pass mark: waveform quiz 100%, repair order 80%.
11	Cab Electronics, Instrumentation, and Body Electrical Systems	20	lab	Students will diagnose and repair faults in cab instrument cluster circuits, HVAC blower circuits, and trailer auxiliary circuits using wiring diagrams, a fuse/relay test light, and a DMM, completing a repair order for each repair.	Component identification walk-around: students locate and identify the main fuse panel, secondary fuse blocks, relay center, instrument cluster connector, HVAC control module, and sleeper auxiliary power unit on a Class 8 cab-over or conventional truck, documenting component locations on a cab-layout sketch. Relay and fuse diagnosis exercise: instructor seeded three faults across the cab electrical system (blown fuse, failed relay, open ground); students use a wiring diagram to identify the circuit for each symptom, test fuses with a DMM (voltage drop method on live circuit), test relays by substitution and coil resistance measurement, and test grounds with a voltage-drop test, then repair each fault. Instrument cluster data link and gauge test: students use the truck's on-dash diagnostic mode or a scan tool to verify that speedometer, tachometer, fuel level, and coolant temperature gauges are receiving correct J1939 data; compare displayed values to scan tool live data to determine if a discrepancy is a gauge fault or a sensor/network fault, documenting findings on a repair order.	Class 8 tractor with cab electrical faults seeded by instructor, OEM cab wiring diagrams, DMM, fused test light, relay substitution set, scan tool with J1939 display capability, repair order forms, cab-layout blank sketch sheets	All three seeded faults must be correctly identified and repaired with verified system operation. Repair order reviewed for correct circuit identification, diagnostic method, repair description, and verification test. Pass mark: all three faults correctly resolved, repair orders complete—85%.
12	Electrical Systems Comprehensive Diagnosis Capstone Lab	18	lab	Students will independently diagnose and repair a complete set of four unknown electrical faults across starting, charging, lighting, and datalink systems on a heavy truck, producing a professional repair order and verbal explanation for each repair.	Four-station fault-diagnosis rotation: each station presents one unknown fault (one per system area); students receive only the customer complaint and the wiring diagram; they plan and execute a diagnostic routine, measure, isolate, and repair the fault within the allotted time per station, completing a repair order at each station. Repair order review and verbal debrief: after completing all four stations, students review their repair orders with the instructor, explain their diagnostic reasoning for each fault, identify any measurement or interpretation error, and describe what they would do differently; instructor records a structured observation score. Peer review exercise: student pairs exchange their completed repair orders and evaluate each other's documentation for clarity, completeness, and accuracy against a standardized rubric, then provide written feedback; instructor reviews peer feedback for quality.	Class 8 truck or multi-station electrical training setup with four independently seeded faults (instructor fault-card set), DMMs, clamp-on ammeters, lab oscilloscope, Cummins Insite or Cat ET diagnostic laptop, OEM wiring diagrams for all systems covered, repair order forms, peer-review rubric sheets	Each of the four repair orders scored by instructor against a rubric covering: correct system identification, correct test sequence, correct measurement values, correct fault conclusion, and correct repair/verification. Verbal explanation scored for diagnostic reasoning. Pass mark: 80% overall across all four repair orders and verbal debrief; any critical safety error results in automatic remediation before credit is awarded.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Electrical Systems Written Knowledge Exam	Written exam	25%	75% or higher (38 of 50 questions correct)	A 50-question closed-book multiple-choice and short-answer exam covering Ohm's Law calculations, circuit theory, wiring diagram interpretation, battery and charging system specifications, J1939 network fundamentals, ECM input/output theory, and federal lighting requirements; questions are mapped to ASE T-series Electrical/Electronic Systems exam content areas and Cummins/Cat electronic systems knowledge objectives. Standard met · Safety · Time · Quality/finish · Documentation
Electrical Diagnosis Skills Demonstration	Skills demonstration	45%	All critical safety steps performed without error; 80% or higher on diagnostic accuracy and documentation rubric	Each student independently diagnoses and repairs two live faults—one in the starting/charging system and one in the datalink/ECM circuit—on a truck set up by the instructor, using only the wiring diagram, a DMM, and a diagnostic scan tool; the student must demonstrate correct LOTO before beginning, complete a repair order for each fault, and explain findings to the instructor verbally, with scoring mapped to ASE T-series practical task requirements. Standard met · Safety · Time · Quality/finish · Documentation
Lab Log Portfolio	Log	15%	85% of entries rated complete and accurate; no missing safety data entries	Students submit their bound lab log booklet containing data tables, wiring diagram annotations, measurement records, and repair orders from all twelve lessons; entries are evaluated for completeness, correct units and values, legible documentation, and evidence of proper diagnostic process, with particular attention to voltage-drop, sensor testing, and ABS entries that map to ASE T-series and OEM diagnostic competency areas. Standard met · Safety · Time · Quality/finish · Documentation
Electrical Safety Compliance Check	Safety audit	15%	100% on all critical items; any critical failure requires immediate remediation and recheck before course credit is granted	An instructor-administered, 20-item observed safety checklist is completed during the Lesson 12 capstone lab, verifying that the student correctly selects and dons PPE, performs a complete LOTO procedure on the battery system before unpowered work, uses the DMM on the correct setting before probing live circuits, and handles and disposes of electrolyte and cleaning materials per shop safety protocols; this check mirrors the safety task requirements embedded in ASE T-series exam prerequisites. Standard met · Safety · Time · Quality/finish · Documentation

TRN-DIES20-06 Trade course

Preventive Maintenance for Diesel & Heavy Trucks

204 hr · ~~$2,940~~ COMPLIMENTARY

Students learn to perform complete, scheduled preventive maintenance (PM) services on Class 6–8 diesel trucks and equipment following OEM service intervals, industry inspection standards, and fleet PM programs. Topics include lubrication systems, fluid analysis, filters, belts and hoses, cooling and fuel systems, brake and chassis inspections, and documentation using digital shop management tools. Successful completion prepares students for ASE T-series task areas covering preventive maintenance and for OEM-specific PM procedures used by Cummins and Caterpillar certified dealers.

Outcomes

Perform a complete multi-point PM inspection on a Class 7–8 diesel truck, identifying defects and recording findings on a standard inspection form with no missed safety-critical items.
Change engine oil, coolant, fuel filters, air filters, and differential/transmission fluids to OEM specifications using correct torque values and fluid types.
Interpret OEM service manuals, lube charts, and PM schedules to determine correct service intervals, fluid capacities, and filter part numbers for common Cummins and Caterpillar diesel engines.
Collect and submit oil and coolant samples for analysis, interpret a basic fluid analysis report, and recommend corrective action based on findings.
Complete accurate PM work orders, inspection checklists, and fluid-record logs using shop management software, meeting fleet documentation standards.
Apply all required PPE, lockout/tagout procedures, and proper chemical handling practices throughout every PM task with zero safety violations.

Course text

How the course runs. 12 blocks: PM Fundamentals: Purpose, Schedules, and Documentation; Shop Safety for PM: PPE, Lockout/Tagout, and Chemical Handling; Engine Oil Systems: Selection, Draining, and Filling; Air and Fuel Filtration: Inspection and Replacement; Cooling System Maintenance and Inspection; Fluid Analysis: Oil and Coolant Sampling Techniques; Belts, Tensioners, and Drive Components; Chassis Lubrication and Driveline Inspection; Brake System PM Inspection; Tires and Wheels: PM Inspection and Inflation; Electrical and Lighting PM Checks; Full PM Service Simulation and Documentation Capstone.

What competent looks like. Perform a complete multi-point PM inspection on a Class 7–8 diesel truck, identifying defects and recording findings on a standard inspection form with no missed safety-critical items. Change engine oil, coolant, fuel filters, air filters, and differential/transmission fluids to OEM specifications using correct torque values and fluid types. Interpret OEM service manuals, lube charts, and PM schedules to determine correct service intervals, fluid capacities, and filter part numbers for common Cummins and Caterpillar diesel engines. Collect and submit oil and coolant samples for analysis, interpret a basic fluid analysis report, and recommend corrective action based on findings. Complete accurate PM work orders, inspection checklists, and fluid-record logs using shop management software, meeting fleet documentation standards. Apply all required PPE, lockout/tagout procedures, and proper chemical handling practices throughout every PM task with zero safety violations.

Lessons · 12 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	PM Fundamentals: Purpose, Schedules, and Documentation	12	theory	Students will explain the purpose of preventive maintenance, describe common PM schedule types (mileage, hours, calendar), and identify the major sections of an OEM lube-and-maintenance chart for a current Cummins or Caterpillar engine.	Read and annotate a Cummins ISX15 or Cat C15 OEM maintenance schedule, highlighting every service item and its interval; pair-share findings with a classmate. Compare three different fleet PM programs (owner-operator, regional carrier, OEM dealer) and fill in a matrix listing interval triggers, documentation forms, and responsible parties. Draft a sample PM work order for a fictitious truck (year, model, mileage given by instructor), selecting correct service items and fluid specifications from the lube chart.	Cummins QuickServe or Cat SIS online service manuals (lab PCs), sample fleet PM schedules, blank work-order forms, shop management software demo login	Quiz: 10 multiple-choice questions on PM interval types, lube-chart reading, and work-order fields; pass = 75% or higher.
2	Shop Safety for PM: PPE, Lockout/Tagout, and Chemical Handling	14	demo	Students will demonstrate correct donning of PPE required for PM tasks, apply a lockout/tagout procedure on a parked truck before beginning under-vehicle work, and safely handle and dispose of used oils, coolants, and aerosol chemicals according to OSHA Hazard Communication (HazCom) standards.	Instructor demo followed by student return-demo: position wheel chocks, apply parking brake verification, and complete a six-step LOTO sequence on a shop truck before sliding under it on a creeper. Locate and read three Safety Data Sheets (SDS) — engine oil, ethylene-glycol coolant, brake cleaner — and record PPE requirements, first-aid measures, and disposal instructions on a provided worksheet. Hands-on PPE station: each student selects correct gloves, safety glasses or face shield, and boot protection for three scenario cards (oil drain, cooling system pressure test, parts washing); instructor evaluates each selection.	Wheel chocks, LOTO locks and tags, SDS binder, nitrile gloves, chemical-splash goggles, face shields, shop aprons, used-oil collection drum, coolant recycling station, OSHA 29 CFR 1910.147 reference card	Instructor safety checklist: student must correctly execute all LOTO steps and select correct PPE for all three scenarios with zero critical errors to pass; any critical error (e.g., missing lockout) = immediate remediation before proceeding.
3	Engine Oil Systems: Selection, Draining, and Filling	20	lab	Students will drain and refill engine oil on a Class 8 diesel truck, selecting the correct API/ACEA-rated oil viscosity grade per the OEM specification, torquing the drain plug and filter to spec, and recording the service on the work order.	Using the OEM service manual, identify the correct oil capacity, viscosity grade, and drain plug torque spec for the assigned truck; record all three on the work order before touching any tool. Drain engine oil safely using a drain pan of adequate capacity, remove and inspect the old spin-on or cartridge oil filter, install the new filter with correct pre-lubrication technique, reinstall and torque the drain plug, then refill to the correct level and verify with dipstick. Start the engine briefly, check for leaks at filter and drain plug, shut down, re-check oil level after stabilization, and enter mileage, oil brand/grade, filter part number, and technician name into the shop management software.	Class 8 shop truck with Cummins or Cat engine, floor jack and jack stands or drive-over pit, drain pans, oil filter wrench set, torque wrench, fresh engine oil (correct grade), replacement filter, shop management software, work-order forms, OSHA SDS for engine oil	Instructor checklist: correct oil grade selected, drain plug torqued to spec ± 10%, filter installed without leaks, correct quantity verified, work order fully and accurately completed; all items must pass — any missed torque spec or wrong fluid = redo task.
4	Air and Fuel Filtration: Inspection and Replacement	18	lab	Students will inspect, remove, and replace the primary and secondary air filters and primary and secondary fuel filters on a diesel truck, correctly noting restriction indicator readings and priming the fuel system before start-up.	Check the air filter restriction indicator and record the reading; compare against OEM maximum restriction spec and decide replace or continue; document the decision with reasoning on the work order. Remove air filter housing, inspect for dust ingestion evidence or housing cracks, install new primary and secondary elements with correct seating and clamp torque, and reinstall housing. Replace primary and secondary fuel filters (spin-on or cartridge type as applicable), prime the fuel system using the hand primer pump or the OEM-specified electric priming procedure, verify no air in the system, start the engine, and check for leaks; enter service in shop management software.	Shop truck, air restriction gauge, OEM air and fuel filter elements, housing clamps, fuel filter wrench, hand priming pump, drain pan, shop towels, OEM service manual, work-order forms	Instructor observation and checklist: restriction reading recorded correctly, correct element part numbers installed, fuel system fully primed with no white smoke on start-up and no fuel leaks after three minutes; pass requires all items met.
5	Cooling System Maintenance and Inspection	18	lab	Students will test coolant concentration and pH, inspect all cooling system hoses and clamps, pressure-test the cooling system cap and system for leaks, drain and refill with OEM-specified coolant type, and collect a coolant sample for analysis.	Using a refractometer and test strips, measure freeze protection and coolant inhibitor (SCA) concentration; compare results to OEM specification and record pass/fail with recommended corrective action. With the system cold and depressurized, inspect all upper and lower radiator hoses, bypass hoses, heater hoses, and all clamps for cracks, softness, abrasion, or collapse; replace any defective hose and tighten loose clamps to OEM spec. Attach a cooling system pressure tester to the radiator neck, pressurize to the cap-rated pressure, and inspect for leaks over five minutes; drain coolant into approved container, flush if directed, refill with correct pre-diluted or correctly mixed coolant, and collect a sample vial for fluid analysis lab.	Coolant refractometer, SCA test strips, cooling system pressure test kit, hose pliers, clamp drivers, torque screwdriver, replacement hoses and clamps, approved coolant (OAT or NOAT as specified), coolant sample vials and mailers, drain pans, coolant recycling station, OEM service manual	Instructor checklist: refractometer reading recorded and interpreted correctly, pressure test held for full five minutes with no drop, correct coolant type installed, sample collected and labeled; all items required to pass.
6	Fluid Analysis: Oil and Coolant Sampling Techniques	10	theory	Students will explain what oil and coolant analysis tests measure, describe the correct vacuum-pump sampling procedure to avoid contamination, and interpret a provided sample fluid analysis report to identify at least two abnormal findings and recommend corrective action.	Instructor-led walkthrough of a real (de-identified) oil analysis report showing elevated iron, silicon, and glycol levels; students identify probable causes (bearing wear, air leak, coolant ingestion) using a fluid analysis interpretation guide. Demonstrate the vacuum-pump sampling procedure on a running or recently shut-down shop engine: insert the sampling tube to mid-sump depth, draw the correct volume, seal and label the sample vial with all required data fields. Small-group exercise: each group receives a different fluid analysis report (oil, coolant, fuel); groups present their interpretation and recommended corrective actions to the class, defending their reasoning.	Vacuum sampling pumps, sample tubes, sample vials and labels, fleet fluid analysis report examples (from Blackstone Labs or equivalent), fluid analysis interpretation guide, whiteboard	Written interpretation worksheet: student correctly identifies all flagged parameters and provides defensible corrective-action recommendations on a provided report; pass = 75% of items correct.
7	Belts, Tensioners, and Drive Components	14	lab	Students will inspect serpentine belts, belt tensioners, idler pulleys, and accessory drive components for wear and damage using OEM inspection criteria, and replace a serpentine belt using correct routing and tensioner release procedure.	Inspect a serpentine belt for cracking, glazing, fraying, and missing chunks using a belt wear gauge and the OEM wear limit; record findings and make a keep-or-replace decision with written justification. Check automatic belt tensioner spring tension and idler pulley bearing play and noise by hand rotation; compare to OEM spec and document condition. Release the tensioner, remove the old belt, route the new belt per the underhood routing diagram, and allow tensioner to seat; start engine briefly and verify belt tracking is centered on all pulleys; document service in work order.	Shop truck, belt wear gauge, breaker bar or tensioner release tool, replacement serpentine belt (correct part number from OEM catalog), belt routing diagram (from OEM service manual), work-order forms	Instructor observation: belt routed correctly with zero misalignment at start-up, tensioner fully seated, all pulleys inspected and findings recorded; incorrect routing = immediate redo before credit awarded.
8	Chassis Lubrication and Driveline Inspection	16	lab	Students will grease all chassis fittings on a Class 7–8 truck using the OEM grease specification and a calibrated grease gun, inspect U-joints, slip yokes, and fifth-wheel plate for wear and lubrication, and document all findings on the PM inspection form.	Using the OEM chassis lube chart, identify every grease fitting location (king pins, tie rod ends, drag link, slack adjusters, fifth-wheel pivot, spring pins); mark each on a truck diagram before approaching the vehicle. With truck on the pit or raised on approved jack stands with LOTO applied, grease all fittings until fresh grease purges (without over-packing sealed bearings), clean excess, and inspect boots for tears or missing caps. Inspect all U-joints for wear (radial and axial play), inspect slip-yoke splines for corrosion and lubrication, inspect fifth-wheel locking jaws and plate for wear and adequate lubrication; record all measurements or condition ratings on the PM form.	Class 8 shop truck on pit or jack stands, grease gun with correct NLGI-grade grease, grease fittings (assorted), torque wrench, LOTO kit, PM inspection form, OEM chassis lube chart	Completed PM inspection form reviewed by instructor: all fittings located and greased, U-joint and fifth-wheel inspection findings documented with pass/fail against OEM wear limits; missing any safety-critical item (e.g., king pin not greased) = task repeated.
9	Brake System PM Inspection	20	lab	Students will perform an air brake PM inspection including measuring lining thickness, checking slack adjuster free stroke against Federal Motor Carrier Safety Administration (FMCSA) out-of-service criteria, inspecting air chambers and hardware, and recording all findings on a standard brake inspection report.	With vehicle on approved stands and air system exhausted/LOTO applied, remove all brake drums or access inspection holes, measure lining thickness at the thinnest point on each shoe, compare to OEM minimum and FMCSA out-of-service criteria, and record measurements on the brake inspection report. Check each slack adjuster for correct free stroke (FMCSA pushrod travel limit) using a ruler at the clevis; identify any slack adjuster that exceeds the limit and note required corrective action; check automatic slack adjuster operation by applying the brakes and observing travel. Inspect air chambers for corrosion, damage, and clamp band tightness; inspect all brake hardware (return springs, anchor pins, cam rollers) for wear; inspect air lines at the axle for chafing or leaks; compile all findings in the brake inspection report and present to instructor.	Class 8 truck on jack stands, brake-lining gauge, ruler, FMCSA out-of-service criteria card, brake inspection report form, air supply, LOTO kit, safety stands	Instructor reviews completed brake inspection report against actual vehicle condition: all lining measurements recorded within ± 1/32 inch of instructor reference, all slack adjuster strokes measured and compared correctly; any undetected out-of-service condition = mandatory remediation and re-inspection.
10	Tires and Wheels: PM Inspection and Inflation	14	lab	Students will inspect all tires on a Class 8 tractor for tread depth, irregular wear patterns, sidewall damage, and valve stem condition, measure and record inflation pressures against load-based OEM specifications, and check all wheel-end fasteners for correct torque.	Using a tread depth gauge, measure tread depth at three points across the width of each tire position and record; identify and describe any irregular wear pattern (cupping, one-side wear, feathering) and name a likely cause for each pattern found. Using a calibrated dial or digital tire pressure gauge, check and record cold inflation pressure at every tire position; compare to OEM inflation table for the rated axle load and adjust as needed using the shop air supply and a clip-on chuck. Torque-check all accessible lug nuts on one drive axle using a calibrated torque wrench to OEM specification; inspect valve stems for caps and condition; inspect wheels for cracks at the pilot bore and at lug seats; document all findings on the PM form.	Class 8 tractor, tread depth gauge, calibrated tire pressure gauge, torque wrench with heavy truck socket, shop air supply with clip-on chuck, OEM inflation table, PM inspection form, chalk or tire marker	PM inspection form reviewed by instructor: all tread depths and pressures recorded and correctly compared to specification, all lug nuts torque-checked, pass = no undocumented defects and correct torque on all checked fasteners.
11	Electrical and Lighting PM Checks	16	lab	Students will test all required vehicle lighting circuits, check battery state of charge and case condition, inspect wiring harnesses at known chafing points, and record all defects on the PM form, referencing FMCSA lighting requirements for interstate operation.	Walk around the truck with a helper activating each circuit: headlights (low and high beam), turn signals, brake lights, marker lights, clearance lights, and reverse lights; record any non-functioning lamp position, lamp type, and corrective action required on the PM form. Using a digital multimeter or dedicated battery tester, measure battery voltage and perform a load test on each battery in the bank; inspect terminal clamps for corrosion, check hold-down security, and record state of charge. Trace wiring harnesses along the frame rail and at the cab-to-chassis junction, checking for chafing against sharp edges or hot surfaces, missing grommets, and loose connectors; document any defect with location description sufficient for a repair technician to find it.	Class 8 tractor, digital multimeter, battery load tester, test light, wiring diagram (OEM), PM inspection form, FMCSA lighting requirements reference card, terminal cleaning brush, anti-corrosion spray	Instructor spot-checks by introducing one hidden defect (disconnected lamp connector or low battery) before the student begins; student must find the seeded defect and all other actual defects; missing the seeded defect = remediation and repeat.
12	Full PM Service Simulation and Documentation Capstone	32	practice	Students will independently complete a full A/B/C-level PM service on an assigned shop truck from drive-in to final road-check, producing a complete, accurate work order and PM inspection report meeting fleet documentation standards, with no safety violations and no missed safety-critical items.	Over two lab sessions, each student performs the entire PM sequence on their assigned truck: LOTO and safety setup, fluid checks and changes (oil, coolant, fuel filter), chassis lube, belt and hose inspection, brake inspection, tire check, lighting check, and all system inspections; each step is documented in real time on the PM work order. Student compiles the completed work order, fluid analysis sample labels, and all inspection checklists into a PM service package and submits it for instructor review; any discrepancy between recorded findings and instructor's known vehicle condition is discussed one-on-one. Student presents the completed PM package in a five-minute verbal debrief with the instructor, identifying the three most significant defects found, explaining their OEM-referenced corrective action recommendations, and describing any safety concern that required the truck to be placed out of service.	Assigned Class 8 shop truck (with seeded defects), all tools from previous labs, shop management software, full PM work-order package, OEM service manual and lube chart, FMCSA out-of-service criteria reference	Instructor scores the PM package using a 50-point rubric (documentation accuracy, correct fluid specifications, all inspection findings recorded, LOTO compliance, no safety violations); pass = 38/50 points AND zero undetected safety-critical defects. Any safety-critical miss = full remediation before course credit.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Written Knowledge Exam	Written exam	25%	75% or higher (38/50 questions correct)	A 50-question multiple-choice exam covering PM intervals, OEM fluid specifications, filter types and replacement procedures, fluid analysis interpretation, FMCSA brake and lighting out-of-service criteria, and HazCom/SDS requirements. Questions are drawn from ASE T-series task list areas related to preventive maintenance and mirror the style of ASE certification exam items. Standard met · Safety · Time · Quality/finish · Documentation
PM Skills Demonstration	Skills demonstration	45%	Pass all critical items; score 38/50 on rubric	Each student performs a timed, instructor-observed PM service on an assigned truck, including oil and filter change, cooling system check, chassis lube, brake lining measurement, slack adjuster check, tire inflation check, and lighting check. The instructor uses a 50-point rubric with designated critical items (LOTO compliance, correct fluid grade, no undetected out-of-service brake or lighting defect); failing any critical item requires remediation and a single re-attempt. Standard met · Safety · Time · Quality/finish · Documentation
PM Lab Log and Documentation Portfolio	Log	15%	All 12 lab log entries submitted and scored; average score 75% or higher across the portfolio rubric	Students maintain a lab log throughout the course, submitting a completed work order or inspection form for every lab lesson. The portfolio is reviewed for accuracy of recorded measurements, correct OEM fluid and torque specifications cited, completeness of all required fields, and professional legibility. Missing entries or entries with inaccurate critical data (wrong fluid grade, fabricated measurements) are returned for correction before final scoring. Standard met · Safety · Time · Quality/finish · Documentation
Safety and Compliance Check	Safety audit	15%	Zero critical violations; 100% of LOTO and PPE steps correctly demonstrated	An unannounced safety audit is conducted once during the lab phase of the course: the instructor observes the student setting up for a PM task and evaluates LOTO application, correct PPE selection and use, proper chemical storage and spill containment, and correct waste-fluid disposal. Any critical violation (absent lockout device, working under unsupported vehicle, wrong PPE for the chemical) results in immediate work stoppage, remediation, and a mandatory re-audit before the student may continue lab work. Standard met · Safety · Time · Quality/finish · Documentation

TRN-DIES20-07 Capstone

Capstone Project: Integrated Diesel & Heavy Truck Systems Overhaul

216 hr · ~~$2,160~~ COMPLIMENTARY

Students complete a comprehensive, supervised overhaul of a heavy-duty diesel vehicle or powertrain assembly, integrating skills from all prior courses including engine, brakes, hydraulics, electrical, and preventive maintenance. Each student produces a full shop documentation package and defends their diagnostic reasoning, repair decisions, and safety practices before a panel of instructors and, where available, an industry evaluator. This course directly maps to ASE T-series task lists and reinforces OEM service procedure standards used in Cummins and Caterpillar factory-authorized work.

Outcomes

Perform a complete multi-system inspection, diagnosis, and repair on a heavy-duty diesel vehicle using OEM service documentation and industry-standard tools, meeting shop-quality standards for each system addressed.
Apply lockout/tagout, PPE selection, and hazardous-material handling procedures correctly throughout all phases of a multi-day overhaul project with zero critical safety violations.
Produce a professional repair order package including vehicle inspection report, diagnostic flowcharts, parts and labor records, torque and measurement logs, and a final road-readiness sign-off consistent with commercial fleet documentation practices.
Demonstrate correct use of diesel-specific diagnostic tools including electronic service tools, multimeters, pressure gauges, and diesel exhaust aftertreatment test equipment to verify system performance before and after repair.
Explain and justify each repair decision, referencing specific OEM or ASE-standard specifications, in a structured oral defense before an instructor panel.
Identify at least three findings discovered during the project that would constitute a failed out-of-service condition under federal or applicable state commercial vehicle inspection criteria and document the corrective actions taken.

Course text

How the course runs. 4 blocks: Project Planning, Vehicle Assignment, and Pre-Work Inspection; Integrated Systems Overhaul: Repair Execution and Documentation; Documentation Package Completion and Pre-Defense Review; Capstone Oral Defense and Final Evaluation.

What competent looks like. Perform a complete multi-system inspection, diagnosis, and repair on a heavy-duty diesel vehicle using OEM service documentation and industry-standard tools, meeting shop-quality standards for each system addressed. Apply lockout/tagout, PPE selection, and hazardous-material handling procedures correctly throughout all phases of a multi-day overhaul project with zero critical safety violations. Produce a professional repair order package including vehicle inspection report, diagnostic flowcharts, parts and labor records, torque and measurement logs, and a final road-readiness sign-off consistent with commercial fleet documentation practices. Demonstrate correct use of diesel-specific diagnostic tools including electronic service tools, multimeters, pressure gauges, and diesel exhaust aftertreatment test equipment to verify system performance before and after repair. Explain and justify each repair decision, referencing specific OEM or ASE-standard specifications, in a structured oral defense before an instructor panel. Identify at least three findings discovered during the project that would constitute a failed out-of-service condition under federal or applicable state commercial vehicle inspection criteria and document the corrective actions taken.

Lessons · 4 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Project Planning, Vehicle Assignment, and Pre-Work Inspection	36	lab	Given an assigned heavy-duty diesel vehicle or powertrain assembly, the student will perform a documented pre-work walkaround and multi-system inspection, identify all deficiencies, prioritize repairs using a written project plan, and establish all required safety controls before any disassembly begins.	Complete a structured pre-work safety brief: identify energy isolation points, establish lockout/tagout controls for all applicable energy sources (electrical, pneumatic, hydraulic, gravity), verify PPE requirements for each system, and record all controls on the shop safety checklist before touching the vehicle. Conduct a full walkaround and under-vehicle inspection using a standardized heavy-truck inspection form, recording findings for engine condition, air brake components, hydraulic lines and cylinders, electrical connectors and harnesses, fluid levels and leaks, exhaust aftertreatment components, and frame/suspension items; photograph every deficiency with a shop tablet. Draft a written project plan that lists every identified deficiency, ranks each by safety criticality, assigns an estimated labor time using a fleet labor guide, identifies the OEM service manual section governing each repair, and is reviewed and signed off by the supervising instructor before work proceeds.	Assigned class shop vehicle (heavy-duty diesel truck or powertrain stand), OEM service manuals (Cummins ISX/X15 or Caterpillar C-series as assigned), fleet-standard pre-trip inspection form, lockout/tagout kit, PPE (safety glasses, gloves, steel-toed boots, hearing protection), shop tablet with camera, labor time guide, ASE T-series task list reference sheets	Instructor reviews the completed inspection form and project plan against the vehicle's known seeded faults and actual condition; student must correctly identify 100% of safety-critical deficiencies (out-of-service items) and at least 80% of all seeded defects, and the project plan must include an appropriate OEM reference for every listed repair before the student is cleared to proceed. Missing any out-of-service item or any active lockout/tagout control failure is an automatic hold.
2	Integrated Systems Overhaul: Repair Execution and Documentation	108	lab	Following the approved project plan, the student will perform the diagnosed repairs across a minimum of four vehicle systems (engine, air brakes, hydraulics or suspension, and electrical/electronic), record all measurements and torque values in real time on a job documentation log, and verify each completed repair against OEM acceptance specifications before moving to the next system.	Execute engine-related repairs as planned (examples: replace injector cups or O-rings, adjust valve lash to OEM spec, replace coolant hoses and thermostat, inspect and pressure-test cooling system, replace fuel filters and prime the system, inspect and service the air intake and exhaust aftertreatment components), recording every measured value—clearances, pressures, torques—on the measurement log in real time using the OEM specification as the pass/fail benchmark. Perform air brake system service tasks as planned (examples: rebuild or replace a slack adjuster, service a brake chamber or verify its stroke against legal limits, drain and inspect air dryer and reservoirs, check and record pushrod travel, verify governor cut-in and cut-out pressures with a shop gauge, inspect brake lining thickness), then perform electrical and charging system tasks (examples: load-test batteries, test alternator output with a multimeter, trace and repair a wiring fault using a wiring diagram, inspect and test ABS wheel speed sensors), entering all readings and any parts replaced onto the running repair order. Complete hydraulic or suspension work as planned (examples: service a hydraulic pump or control valve, bleed a hydraulic circuit, inspect cylinders and hoses for leakage, replace a steering component or leaf spring pin to spec), then perform a final systems function check by running the engine to operating temperature, cycling all hydraulic functions, applying and releasing the air brake system, and road-testing the vehicle in the school lot or on an approved route under instructor supervision; record all post-repair verification measurements and note any remaining concerns.	Full shop toolset (hand tools, torque wrenches, dial indicators, feeler gauges), electronic service tool (Cummins INSITE or Caterpillar ET as applicable), digital multimeter, brake stroke indicator, air pressure test gauge set, hydraulic pressure gauge set, battery load tester, parts as required (supplied by program parts inventory), OEM service manuals, repair order forms, measurement log sheets, PPE throughout	Instructor performs a rolling check at the completion of each system: all recorded torque and measurement values must fall within OEM specification, or the student must document the out-of-spec condition and the corrective action taken. Any repair involving a safety-critical system (brakes, steering) must be independently verified by the instructor before the vehicle is moved. The repair order must be current and legible at every instructor check. A system sign-off is denied if documentation is missing or if any measurement was recorded after the fact rather than in real time; the student repeats the affected section.
3	Documentation Package Completion and Pre-Defense Review	36	practice	The student will compile all job documents into a complete professional repair order package, write a structured technical narrative summarizing findings, repairs, and verification results, and participate in a peer review session to identify and correct any gaps before the oral defense.	Assemble the final documentation package in the required order: cover sheet with vehicle identification and student information, pre-work inspection form with photographs, project plan with instructor sign-off, running repair order with all parts and labor entries, measurement and torque logs, post-repair verification readings, and a final road-readiness or function-test sign-off; cross-check every OEM specification cited in the log against the source page in the service manual and annotate the package with manual references. Write a two-to-three page technical narrative that describes the vehicle's initial condition, the diagnostic reasoning used to confirm each deficiency, the repair or service procedure followed for each system (referencing the OEM procedure by section), the post-repair verification method and results, and a discussion of any findings that would have constituted a commercial vehicle out-of-service condition and how they were resolved; this narrative must be written in the student's own words and must not copy OEM text verbatim. Participate in a structured peer review with a partner: each student reads the other's documentation package using a provided checklist covering completeness, accuracy of OEM references, clarity of the narrative, and correctness of measurement entries; each reviewer writes written feedback on the checklist and returns it; the original author then revises the package based on feedback and submits the final version with the peer review sheet attached.	All job documents accumulated during Lesson 2, OEM service manuals, documentation package checklist, peer review checklist, word processor or shop documentation software, printer for final submission, ASE T-series task list as a cross-reference for completeness	Instructor reviews submitted packages using the documentation checklist before granting clearance to schedule the oral defense; all required sections must be present, every torque and measurement entry must have a corresponding OEM specification listed, and the technical narrative must correctly identify all out-of-service conditions found during the project. Packages missing required sections or containing unsupported specifications are returned for correction; the student has one opportunity to correct and resubmit before the scheduled defense date.
4	Capstone Oral Defense and Final Evaluation	36	lab	The student will present and defend the completed repair order package and technical narrative before a panel of at least two evaluators, answer scenario-based follow-up questions about diagnostic reasoning and safety decisions made during the project, and demonstrate on the vehicle or powertrain assembly one selected measurement or adjustment procedure from the completed work.	Deliver a structured 10-to-15 minute oral presentation to the panel covering the vehicle's initial condition, the multi-system inspection findings ranked by safety criticality, the repair sequence chosen and the rationale for that sequence, each OEM specification used as a pass/fail benchmark, and the post-repair verification results; the student uses the documentation package as the visual reference and must be able to navigate to any page on request. Respond to a minimum of eight panel questions drawn from the following areas: why a specific diagnostic step was chosen over an alternative, what the consequence of leaving a specific deficiency unrepaired would be on a commercial vehicle, how a specific measurement was taken and what tool was used, what the OEM torque specification is for a named fastener on the project vehicle and where that specification is found, and what regulatory basis applies to at least one out-of-service condition identified during the project. Perform one live demonstration on the vehicle or powertrain assembly selected by the panel from the student's completed work (examples: re-measure valve lash on one cylinder and compare to spec, demonstrate correct brake pushrod stroke measurement and interpretation, perform a battery load test and interpret results, cycle a hydraulic circuit and read system pressure on a gauge); the student narrates each step including the safety control in place and the OEM acceptance criterion, and the panel scores the demonstration on a structured rubric.	Student's completed and submitted documentation package (printed and digital), the project vehicle or powertrain assembly in its post-repair state, all tools used in the live demonstration (selected in advance with instructor), panel evaluation rubric, ASE T-series task list for panel reference, OEM service manuals available for student reference during the defense	Panel scores the defense using the rubric across four domains: presentation clarity and documentation accuracy (25%), quality of answers to diagnostic and safety questions (25%), accuracy of OEM specification references cited verbally (25%), and correctness and safety of the live demonstration (25%). A passing score is 75% overall with no single domain below 60%. A student who fails one domain may remediate that domain once within five school days; a student who fails the overall defense repeats the full defense after additional instructor-directed practice.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Capstone Vehicle Overhaul Project	Project	60%	All safety-critical systems must pass independent instructor verification before the vehicle is moved; overall project score of 75% or higher on the combined inspection, repair execution, and post-repair verification rubric; zero unresolved lockout/tagout violations throughout the project.	The primary project assessment evaluates the student's ability to plan, execute, document, and verify a multi-system heavy-duty diesel repair from start to finish. Instructors score the project across the full repair cycle using a rubric that mirrors ASE T-series task areas, with safety compliance treated as a threshold requirement rather than a scored item—any critical safety violation halts assessment until the condition is corrected and reviewed. Meets specification · Within estimate · Workmanship · Safety · Documentation
Professional Repair Order Documentation Portfolio	Portfolio	20%	Complete submission of all required documents; technical narrative correctly identifies all out-of-service conditions found; 80% or higher score on the documentation completeness and accuracy checklist; peer review sheet attached and reviewer feedback addressed.	The portfolio assessment evaluates the student's ability to produce shop-quality documentation that would be acceptable in a commercial fleet or dealership service department. The instructor scores the package for completeness, accuracy of recorded measurements versus OEM specifications, correct citation of service manual references, and the clarity and technical accuracy of the written narrative. Completeness · Organization · Evidence quality
Capstone Oral Defense	Oral / panel	20%	75% overall on the four-domain panel rubric with no single domain below 60%; live demonstration must meet OEM specification for the selected procedure and must include correct identification of all safety controls in use.	The oral defense requires the student to present and justify all work performed to a panel of evaluators, demonstrating the level of diagnostic reasoning and technical communication expected of a professional diesel technician. The defense also includes a live hands-on demonstration scored for procedural accuracy, safety practice, and correct use of OEM specifications, directly reflecting the performance standards tested in the ASE T-series examinations. Explains decisions · Answers technical questions · Professional communication

TRN-DIES20-08 Externship / clinical

Externship / Worksite Placement – Diesel & Heavy Truck

324 hr · ~~$1,295~~ COMPLIMENTARY

Students complete 324 supervised hours at an approved diesel or heavy-truck employer, applying classroom and lab skills to live vehicle and equipment repair under the direct oversight of a journeyman technician or shop foreman. Competencies are tracked against ASE T-series task areas so that employer evaluations map directly to the credential exam domains students will sit in Course 9. The placement develops professional habits—timekeeping, work-order writing, shop communication, and tool accountability—that classroom settings cannot replicate.

Outcomes

Perform entry-level diesel and heavy-truck service tasks—including preventive maintenance, brake inspection, electrical diagnosis, and fluid-system service—to employer quality standards on live equipment.
Document every repair event with a complete, legible work order that includes customer complaint, cause, correction, and parts/labor information consistent with ASE T-series task requirements.
Demonstrate workplace professionalism, including punctual attendance, proper PPE selection, lockout/tagout compliance, and effective communication with supervisors and co-workers across all 324 placement hours.
Receive a satisfactory or above rating from the site supervisor on all domains of the standardized employer evaluation rubric at the midpoint and final review.
Identify and safely manage at least three shop-specific hazards encountered during the placement by applying OSHA general industry or 29 CFR 1910/1926 standards appropriate to each situation.
Reflect on externship experience to set measurable post-graduation career goals, connecting observed workplace competencies to specific ASE T-series exam areas.

Course text

How the course runs. 4 blocks: Pre-Placement Orientation and Worksite Readiness; Supervised On-Site Service Hours – Phase 1 (Weeks 1–6); Supervised On-Site Service Hours – Phase 2 (Weeks 7–14) with Midpoint Evaluation; Final Employer Evaluation, Portfolio Completion, and Reflection Debrief.

What competent looks like. Perform entry-level diesel and heavy-truck service tasks—including preventive maintenance, brake inspection, electrical diagnosis, and fluid-system service—to employer quality standards on live equipment. Document every repair event with a complete, legible work order that includes customer complaint, cause, correction, and parts/labor information consistent with ASE T-series task requirements. Demonstrate workplace professionalism, including punctual attendance, proper PPE selection, lockout/tagout compliance, and effective communication with supervisors and co-workers across all 324 placement hours. Receive a satisfactory or above rating from the site supervisor on all domains of the standardized employer evaluation rubric at the midpoint and final review. Identify and safely manage at least three shop-specific hazards encountered during the placement by applying OSHA general industry or 29 CFR 1910/1926 standards appropriate to each situation. Reflect on externship experience to set measurable post-graduation career goals, connecting observed workplace competencies to specific ASE T-series exam areas.

Lessons · 4 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Pre-Placement Orientation and Worksite Readiness	16	theory	Students confirm placement logistics, review site-specific safety rules, and demonstrate understanding of professional expectations before their first shop day.	Students complete a pre-placement checklist covering required PPE inventory (steel-toe boots, safety glasses, gloves, hearing protection), valid ID, emergency contacts, and transportation plan; instructor reviews each item individually. Cohort participates in a mock first-day scenario: students role-play clocking in, receiving a work order from a supervisor, asking clarifying questions, and locating shop MSDS/SDS binders and emergency exits. Each student drafts a personal Learning Goals Contract listing five specific ASE T-series task areas they intend to practice during the placement and shares it with the instructor for sign-off.	Pre-placement checklist form, Learning Goals Contract template, OSHA 10 wallet cards (from Course 1), site supervisor contact packet, ASE T-series task list (current edition), shop PPE reference poster	Instructor verifies completed checklist and signed Learning Goals Contract for every student before the student is cleared to begin on-site hours; any missing item delays placement start.
2	Supervised On-Site Service Hours – Phase 1 (Weeks 1–6)	148	field	Students perform employer-assigned diesel and heavy-truck service tasks under direct journeyman supervision, logging each task against the corresponding ASE T-series area in their daily field journal.	Each workday, students record a minimum of one completed journal entry per repair or inspection event, noting vehicle unit number, complaint, diagnosis steps taken, corrective action, parts used, and the ASE T-series task area the job most closely matches. At the end of each week, the site supervisor initials the student's weekly hour log and provides a brief verbal performance comment; students transcribe that comment into their journal and note one area for improvement. Students photograph (with employer permission) at least two diagnostic findings per week—such as a worn brake lining, a corroded battery terminal, or a contaminated fuel filter—and annotate the image with a written explanation for their portfolio.	Field journal (bound, carbon-copy work-order log), employer weekly hour-log form, smartphone or shop camera (with employer sign-off), ASE T-series task list, PPE per site requirements, site-issued shop tools	Instructor makes one on-site visit per student during Phase 1 to observe task performance and review journal entries; journal must contain a minimum of 30 complete entries with ASE task codes by end of week 6, and the site supervisor's weekly initials must be present for all six weeks.
3	Supervised On-Site Service Hours – Phase 2 (Weeks 7–14) with Midpoint Evaluation	144	field	Students sustain and expand their on-site skill demonstration, complete a formal midpoint employer evaluation, and adjust their Learning Goals Contract based on feedback.	At the start of Week 7, instructor and student jointly review Phase 1 journal entries; student identifies two ASE T-series task areas with fewer than three logged examples and deliberately seeks those job types during Phase 2. Site supervisor completes the standardized Midpoint Employer Evaluation Rubric at the end of Week 10, scoring the student on attendance/punctuality, safety compliance, technical skill, work quality, communication, and initiative on a four-point scale; student and supervisor meet to discuss scores. Students document a minimum of two complex diagnostic events during Phase 2—each requiring use of a diagnostic scan tool, multimeter, or hydraulic pressure gauge—writing a narrative that includes symptom, test procedure, reading obtained, and final determination, mirroring the documentation expected on ASE T-series tasks.	Midpoint Employer Evaluation Rubric, updated Learning Goals Contract, field journal (continued), diagnostic scan tool (employer-provided), multimeter, hydraulic pressure test kit, ASE T-series task list	Midpoint Employer Evaluation Rubric must show a score of 3 or higher (out of 4) on safety compliance and work quality domains; students scoring below 3 in any domain receive a written improvement plan from the instructor within five business days and are re-evaluated by Week 13.
4	Final Employer Evaluation, Portfolio Completion, and Reflection Debrief	16	practice	Students finalize and organize their externship portfolio, receive the formal final employer evaluation, and deliver a structured oral reflection connecting placement experience to credential exam readiness.	Students organize their full field journal, annotated photographs, hour logs, work-order copies, and both employer evaluation forms into a professional portfolio (physical binder or digital equivalent approved by instructor); they add a table of contents cross-referenced to ASE T-series task areas covered. Site supervisor completes the Final Employer Evaluation Rubric using the same four-point scale as the midpoint; supervisor and student sign the form, and a copy is submitted to the institution within five business days of the last placement day. Back on campus, students deliver a 10-minute structured oral reflection to a panel of the instructor and one peer, addressing: (1) the most challenging repair they performed, (2) one safety situation they managed and how, (3) which ASE T-series exam areas feel strongest versus weakest, and (4) one specific post-graduation career goal with a realistic timeline.	Portfolio binder or approved digital template, Final Employer Evaluation Rubric, oral reflection scoring guide, ASE T-series task list, instructor panel evaluation form	Portfolio is judged complete when all required sections are present and at least 60 unique ASE-coded journal entries are documented across Phases 1 and 2; oral reflection must score satisfactory or above on all four required talking points using the rubric; final employer evaluation must average 3.0 or higher across all six domains to pass the externship.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Site Supervisor Skills Demonstration Evaluation (Final)	Skills demonstration	70%	Average score of 3.0 or higher out of 4.0 across all six rubric domains (attendance/punctuality, safety compliance, technical skill, work quality, communication, initiative) on the Final Employer Evaluation Rubric, with no individual domain scoring below 2.	The employer or designated journeyman supervisor completes the standardized Final Employer Evaluation Rubric at the conclusion of the 324-hour placement, rating the student's observable, real-world performance on live equipment and in daily shop operations. Scores below the threshold in any domain trigger a mandatory remediation conference between the student, instructor, and site supervisor before a course-passing grade is issued. Competency · Safety · Attendance · Conduct · Initiative
Externship Field Journal and Portfolio Log	Log	30%	Portfolio contains a minimum of 60 complete, supervisor-initialed work-order journal entries cross-coded to ASE T-series task areas, covers at least six distinct T-series domains, and earns a satisfactory rating on the portfolio completeness rubric; oral reflection panel scores satisfactory or above on all four required talking points.	The bound field journal and assembled portfolio serve as the longitudinal lab log for the externship, demonstrating breadth of tasks performed, accuracy of technical documentation, and the student's capacity to connect hands-on work to the credential exam framework. The oral reflection debrief functions as the portfolio defense, allowing the instructor to probe the authenticity and depth of the logged entries. Complete · Verified

TRN-DIES20-09 Exam prep

Certification Exam Preparation: ASE T-Series & OEM Diesel

90 hr · ~~$900~~ COMPLIMENTARY

This course provides a structured, exam-mapped review of every content area tested on the ASE T-Series truck technician exams and Cummins/Cat OEM certification assessments, using timed practice questions, diagnostic gap analysis, and full-length mock exams. Learners consolidate knowledge from all prior courses, identify weak areas, and build test-taking stamina and confidence. The course culminates in a full mock certification examination administered under proctored conditions.

Outcomes

Correctly answer at least 75% of practice questions in each ASE T-Series content area (engines, drive train, brakes, suspension/steering, electrical, HVAC, preventive maintenance) on a scored diagnostic assessment.
Demonstrate understanding of OEM Diesel (Cummins and Cat) certification topic areas including engine performance, fault code diagnosis, and electronic control system operation by scoring 75% or higher on a domain-specific practice set.
Apply a systematic process—read, eliminate, reason, verify—to multiple-choice diesel technician questions, reducing careless errors to fewer than 10% of attempted items on timed practice sets.
Complete a full-length, timed mock ASE T-Series exam and a mock OEM Diesel practice exam, scoring at or above the established passing benchmark on each.
Produce a personal study plan identifying demonstrated weak domains and listing specific reference materials and hands-on review steps for each gap area.
Explain the registration process, required documentation, testing logistics, and professional conduct expectations for sitting an ASE or OEM proctored credentialing exam.

Course text

How the course runs. 4 blocks: Diagnostic Baseline & Exam Landscape; Domain-by-Domain Content Review: ASE T-Series; OEM Diesel Certification Review: Cummins & Cat Systems; Full Mock Certification Examinations & Post-Exam Debrief.

What competent looks like. Correctly answer at least 75% of practice questions in each ASE T-Series content area (engines, drive train, brakes, suspension/steering, electrical, HVAC, preventive maintenance) on a scored diagnostic assessment. Demonstrate understanding of OEM Diesel (Cummins and Cat) certification topic areas including engine performance, fault code diagnosis, and electronic control system operation by scoring 75% or higher on a domain-specific practice set. Apply a systematic process—read, eliminate, reason, verify—to multiple-choice diesel technician questions, reducing careless errors to fewer than 10% of attempted items on timed practice sets. Complete a full-length, timed mock ASE T-Series exam and a mock OEM Diesel practice exam, scoring at or above the established passing benchmark on each. Produce a personal study plan identifying demonstrated weak domains and listing specific reference materials and hands-on review steps for each gap area. Explain the registration process, required documentation, testing logistics, and professional conduct expectations for sitting an ASE or OEM proctored credentialing exam.

Lessons · 4 blocks

#	Lesson	Hr	Type	Objective	Activities	Materials	Check
1	Diagnostic Baseline & Exam Landscape	12	theory	Students will identify their individual knowledge gaps across all ASE T-Series content domains and both OEM (Cummins/Cat) certification topic areas by completing a scored diagnostic practice set and analyzing results.	Complete a 100-question timed diagnostic practice exam covering all ASE T-Series task list domains (diesel engines, drive train, brakes, suspension and steering, electrical/electronic systems, HVAC, preventive maintenance) and record scores by domain on a personal gap-analysis worksheet. Review the official ASE T-Series task lists and Cummins/Cat OEM certification content outlines side-by-side, mapping each task to the course it was covered in (courses 1–8) and flagging tasks where the diagnostic score was below 70%. In pairs, discuss credential registration logistics—exam fees, scheduling, required work experience documentation, ID requirements, and retake policies—using current ASE candidate information and OEM program guides, then each learner completes a personal exam readiness checklist and drafts a written study schedule for the remaining three lessons.	100-question ASE T-Series diagnostic practice bank (instructor-developed, aligned to current task lists); official ASE T-Series task list PDFs (free download from ASE); Cummins and Cat OEM certification content outlines; gap-analysis worksheet; personal study schedule template; whiteboard for group debrief.	Each student submits a completed gap-analysis worksheet with domain scores entered and a written personal study plan listing every flagged domain and a specific action for each. Pass standard: all domains recorded, at least three concrete study actions identified per flagged area; instructor reviews for completeness before Lesson 2.
2	Domain-by-Domain Content Review: ASE T-Series	30	theory	Students will review and correctly apply knowledge in each ASE T-Series task list domain—diesel engines, drive train, brakes, suspension/steering, electrical/electronic systems, HVAC, and preventive maintenance—by working through targeted question sets and instructor-led concept clarifications.	Rotate through seven instructor-facilitated review stations (one per T-Series domain), spending approximately four hours per domain: at each station students answer a 20–30 question domain practice set under timed conditions, then the instructor works through every question explaining the correct answer, the distractor logic, and the underlying technical principle—referencing the diesel engine textbook, air brake manual, and electrical systems reference used in earlier courses. For each domain, complete at least one hands-on reinforcement task at a bench or vehicle where time allows—for example, trace a wiring diagram to verify a relay circuit answer (Electrical domain), inspect brake chamber stroke against adjustment limits (Brakes domain), or read a fault code on a shop engine with a scan tool (Diesel Engines domain)—connecting recalled theory to physical evidence. After each domain station, update the personal gap-analysis worksheet with a post-review score and write one paragraph explaining the most common mistake made in that domain and how to avoid it on exam day; instructor collects and returns with written feedback before the next station.	Domain-specific practice question banks (20–30 questions each, aligned to current ASE T-Series task lists); diesel engine textbook used in Course 2; air brake reference from Course 3; electrical/electronic systems reference from Course 5; PM reference from Course 6; shop truck or training vehicle; scan tool with fault code capability; wiring diagrams; brake adjustment tools; PPE (safety glasses, gloves); whiteboard and markers.	End-of-station domain quiz score recorded on gap-analysis sheet; students must average 70% or higher across all seven domain post-review sets to proceed. Students scoring below 70% in a domain complete an assigned supplemental question set before Lesson 3; instructor reviews all worksheets and supplemental work for completeness.
3	OEM Diesel Certification Review: Cummins & Cat Systems	18	demo	Students will correctly explain and apply Cummins and Caterpillar engine and electronic control system concepts—including fault code retrieval, engine performance diagnosis, fuel system operation, and emissions system function—by completing OEM-aligned practice sets and live diagnostic demonstrations.	Instructor-led demonstration using a Cummins engine equipped with INSITE software or equivalent shop tool and a Cat engine with ET (Electronic Technician) software or equivalent: students observe live fault code retrieval, parameter review, and injector cut-out testing, then each student takes a turn retrieving active and inactive codes, recording freeze-frame data, and interpreting one code using the OEM service information, documenting findings on a standardized OEM diagnostic worksheet. Work through a 60-question OEM practice set (30 Cummins-focused, 30 Cat-focused) covering electronic engine controls, common rail or HEUI fuel system principles, emissions aftertreatment (DPF, SCR, DEF system fundamentals), and engine brake operation; after completing the timed set, students self-score and identify every missed question, then look up the correct technical explanation in OEM service manuals or instructor-provided reference sheets. Small-group case study: each group receives a printed OEM-style shop scenario card (e.g., 'Unit in limp-home mode, active fault code logged, customer reports loss of power on grades') and must write a step-by-step diagnostic plan citing correct OEM terminology and test sequence, then present the plan to the class for group critique—instructor corrects any inaccurate steps and explains OEM-preferred procedure.	Cummins engine (in-shop training unit) with INSITE diagnostic software or instructor-provided Cummins INSITE training module; Cat engine with Cat ET diagnostic software or instructor-provided Cat ET training module; OEM service information (Cummins QuickServe online or printed equivalent; Cat SIS or printed equivalent); OEM diagnostic worksheets; 60-question OEM practice question bank; shop scenario case-study cards; laptop or tablet per student pair; PPE (safety glasses).	Students must score 70% or higher on the 60-question OEM practice set and submit a complete, technically accurate OEM diagnostic worksheet from the live demonstration activity. Diagnostic worksheet is evaluated against an instructor answer key; any critical step omitted (e.g., verify active fault before clearing) requires the student to repeat the demonstration task before the mock exam.
4	Full Mock Certification Examinations & Post-Exam Debrief	30	practice	Students will demonstrate examination readiness by completing full-length, timed mock versions of the ASE T-Series and OEM Diesel certification exams under proctored conditions and then using scored results to finalize their personal exam strategy.	Sit a full-length ASE T-Series mock exam administered under strict proctored conditions (no notes, timed, one question at a time, answers recorded on a bubble sheet or digital form): the mock exam covers all T-Series domains at the proportional weighting described in the current ASE task list; upon completion, instructor scores exams and returns results by domain so students can see exactly where points were gained or lost. Sit a full-length OEM Diesel mock exam (Cummins/Cat combined format) under identical proctored conditions, covering electronic controls, fuel and air systems, emissions aftertreatment, engine mechanical, and diagnostic interpretation; instructor scores and returns results with a domain breakdown. Structured post-exam debrief: each student completes a final gap-analysis update comparing Lesson 1 diagnostic scores to mock exam scores, writes a one-page personal exam-day action plan (study priorities for the days before the real exam, test-day logistics, strategies for difficult question types), and participates in a full-class review of the ten most commonly missed questions from both mock exams, with instructor explanation of the correct technical reasoning for each.	Full-length ASE T-Series mock exam (instructor-developed or licensed practice exam, proportionally weighted to current task list, minimum 75 questions); full-length OEM Diesel mock exam (instructor-developed, minimum 60 questions, Cummins and Cat content); bubble sheets or digital exam platform; timer; proctoring protocol sheet; scoring rubrics; updated gap-analysis worksheet; blank paper for action plan; current ASE T-Series task list for debrief reference.	Students must score 70% or higher on both the ASE T-Series mock exam and the OEM Diesel mock exam to receive a course completion endorsement. Students who score below 70% on either exam meet individually with the instructor, complete a targeted remediation assignment addressing every missed domain, and must pass an alternate shortened mock set (minimum 30 questions per failing domain) at 75% before the instructor signs the course completion record.

Assessments

Assessment	Type	Weight	Pass standard	Method & rubric
Full-Length Proctored Mock Certification Examination (ASE T-Series & OEM Diesel)	Mock certification exam	100%	70% or higher on both the ASE T-Series mock exam and the OEM Diesel mock exam, with no single domain falling below 60%; students below either threshold complete instructor-assigned remediation and must pass a follow-up domain assessment at 75% before course completion is recorded.	Students sit two full-length, timed mock exams back-to-back under proctored conditions that replicate actual credentialing test environments: the ASE T-Series mock covers all task list domains at proportional weighting, and the OEM Diesel mock covers Cummins and Cat electronic, fuel, emissions, and mechanical content. Results are returned with a full domain breakdown, and each student submits a final written exam-day action plan based on their scored performance. Score · Time management

Program completion

External credential: ASE T-series; OEM Diesel (Cummins/Cat)

Students sit the ASE T-series examinations administered by the National Institute for Automotive Service Excellence, and may also sit Cummins and/or Caterpillar OEM certification assessments administered directly by those manufacturers through their respective training and credentialing programs. Pass standard: Credential issued by the body.

Back to Diesel & Heavy Truck · How the school gets authority to award these credentials