Supervised On-Site Service Hours – Phase 2 (Weeks 7–14) with Midpoint Evaluation

Supervised On-Site Service Hours – Phase 2 (Weeks 7–14) with Midpoint Evaluation

What Phase 2 Means for Your Development

Phase 1 introduced you to the shop floor, its routines, and its expectations. Phase 2 raises the bar. Over Weeks 7 through 14 you are expected to move from observer-participant to a contributing technician who can be trusted with increasingly complex tasks under supervision. Employers notice the difference between a student who drifts through days and one who actively fills skill gaps. Your job this phase is to be the second type.

At the opening of Week 7, sit down with your instructor and go through every Phase 1 journal entry together. Count logged examples in each ASE T-series task area. Any area with fewer than three entries is a gap. You must identify at least two such areas and write them into your updated Learning Goals Contract. Then tell your site supervisor. A good supervisor will route the right work orders your way once they know what you are chasing.

The Midpoint Employer Evaluation Rubric

At the end of Week 10 your site supervisor scores you on six domains using a four-point scale:

• Attendance and punctuality – Are you there, on time, every scheduled day?
• Safety compliance – Do you follow lockout/tagout (LOTO) procedures, wear required PPE, and handle hazardous materials correctly every single time?
• Technical skill – Can you perform trade tasks correctly with the level of guidance expected at this stage?
• Work quality – Is your work accurate, complete, and properly documented?
• Communication – Do you ask clear questions, listen to direction, and report problems promptly?
• Initiative – Do you look for the next task without being told, and do you arrive prepared?

A score of 3 or higher in every domain is the program standard. Safety compliance and work quality are the two non-negotiable domains: a score below 3 in either one triggers a written improvement plan from your instructor within five business days. That plan will set specific corrective actions and schedule a re-evaluation no later than Week 13. A score below 3 in any other domain also results in a written improvement plan. The goal of the plan is to help you succeed, not to penalize you—but you must follow through.

After the supervisor completes the rubric, you and the supervisor meet to discuss every score. Come to that meeting having already thought about what you would score yourself and why. Disagreements handled professionally are a normal part of workplace feedback. Take notes. Update your Learning Goals Contract the same day.

Safety Obligations in Phase 2

As tasks become more complex, hazard exposure increases. The following practices are non-negotiable on any diesel and heavy truck worksite:

• Lockout/tagout (LOTO): Before any service that could result in unexpected energization—electrical, pneumatic, hydraulic, or mechanical—apply LOTO per the employer's written procedure. Verify the energy source is isolated before touching the system.
• PPE selection: Match PPE to the specific hazard. Safety glasses alone are insufficient when working with pressurized fuel or hydraulic systems; add face shield and chemical-resistant gloves. When under a lifted vehicle, hard hat use is determined by site policy.
• Vehicle support: Never work under a vehicle supported only by a floor jack. Use rated jack stands or a lift with safety locks engaged.
• High-pressure systems: Diesel common-rail injection systems can operate at extremely high pressures. Follow the OEM service manual procedure to depressurize before disconnecting any fuel line. Hydraulic systems on heavy equipment carry similar risks.
• Scan-tool and electrical safety: When back-probing connectors with a multimeter, use insulated probes and ensure ignition state matches the test procedure. Do not defeat fuses or create unintended circuits.

Documenting Complex Diagnostic Events

You must document at least two complex diagnostic events during Phase 2. "Complex" means the diagnosis required a diagnostic scan tool, a digital multimeter (DMM), or a hydraulic pressure test gauge—not just a visual inspection.

Each write-up in your field journal must contain four elements:

1. Symptom – Describe what the driver or equipment operator reported, and what you observed.

2. Test procedure – Describe exactly what tool you used, how you set it up, and what the OEM or ASE procedure called for.

3. Reading obtained – Record the actual value: a fault code and freeze-frame data, a voltage or resistance measurement, or a hydraulic pressure reading with units.

4. Final determination – State the root cause and the repair or recommendation that followed.

This four-part structure mirrors the documentation style tested on ASE T-series tasks and expected in OEM (Cummins, Caterpillar) certification scenarios. Writing it clearly now builds the habit that will serve you in both credentialing exams and professional work orders for the rest of your career.

Connecting Phase 2 Work to Your Credentials

The ASE T-series examinations are knowledge-based tests covering truck systems aligned with real-world tasks. Every diagnostic event you document is evidence that you have performed those tasks, which reinforces the knowledge behind the test questions. OEM credentials from Cummins and Caterpillar similarly reward demonstrated competence in their specific engine and system families. When you seek out fault-code diagnosis on a Cummins ISX or track down a Cat hydraulic pressure fault, you are building targeted knowledge for both credential paths simultaneously.

Keeping Your Learning Goals Contract Current

Your Learning Goals Contract is a living document. Update it after the Week 7 gap review, after the Week 10 midpoint meeting, and whenever a significant new experience changes your self-assessment. An up-to-date contract shows maturity and professional self-awareness—qualities that score well on the initiative domain of the rubric and that employers remember when references are requested.