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Oct 11, 2024
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HDD 106 - Heavy Duty Diesel Electrical/Electronic Systems Level ICredits: 4 Introduces basic electrical/electronic systems on heavy duty diesel vehicles. Practices NATEF tasks related to electrical/electronic systems.
Prerequisite(s): None Corequisite(s): HDD 108 and HDD 112 . Lecture Hours: 20 Lab Hours: 50 Meets MTA Requirement: None Pass/NoCredit: Yes
Outcomes and Objectives
- Complete general HDD electrical and electronic systems level I NATEF tasks as listed below.
- Read and interpret electrical/electronic circuits using wiring diagrams.
- Check continuity in electrical/electronic circuits using appropriate test equipment.
- Check applied voltages, circuit voltages, and voltage drops in electrical/electronic circuits using appropriate test equipment.
- Check current flow in electrical/electronic circuits and components using appropriate test equipment.
- Check resistance in electrical/electronic circuits and components using appropriate test equipment.
- Locate shorts, grounds, and opens in electrical/electronic circuits.
- Identify parasitic (key-off) battery drain problems; perform tests; determine needed action.
- Inspect and test fusible links, circuit breakers, relays, solenoids, and fuses; replace as needed.
- Inspect and test spike suppression devices; replace as needed.
- Check frequency and pulse width signal in electrical/electronic circuits using appropriate test equipment.
- Complete Level 1 HDD NATEF tasks related to Battery Service as listed below.
- Identify battery type; perform appropriate battery load test; determine needed action.
- Determine battery state of charge using an open circuit voltage test.
- Inspect, clean, and service battery; replace as needed.
- Inspect and clean battery boxes, mounts, and hold downs; repair or replace as needed.
- Complete related Electrical Systems Level 1 HDD NATEF tasks as listed below.
- Identify causes of slow, intermittent, or no power window operation; determine needed action.
- Inspect and test motors, switches, relays, connectors, terminals, wires, and control components/modules of power window circuits; repair or replace as needed.
- Inspect and test block heaters; determine needed repairs.
- Inspect and test engine cooling fan electrical control components/modules, wiring; repair or replace as needed.
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