HDD 106 - Heavy Duty Diesel Electrical/Electronic Systems Level I

Credits: 4
Instructional Contact Hours: 5

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.
1. Read and interpret electrical/electronic circuits using wiring diagrams.
2. Check continuity in electrical/electronic circuits using appropriate test equipment.
3. Check applied voltages, circuit voltages, and voltage drops in electrical/electronic circuits using appropriate test equipment.
4. Check current flow in electrical/electronic circuits and components using appropriate test equipment.
5. Check resistance in electrical/electronic circuits and components using appropriate test equipment.
6. Locate shorts, grounds, and opens in electrical/electronic circuits.
7. Identify parasitic (key-off) battery drain problems; perform tests; determine needed action.
8. Inspect and test fusible links, circuit breakers, relays, solenoids, and fuses; replace as needed.
9. Inspect and test spike suppression devices; replace as needed.
10. 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.
1. Identify battery type; perform appropriate battery load test; determine needed action.
2. Determine battery state of charge using an open circuit voltage test.
3. Inspect, clean, and service battery; replace as needed.
4. 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.
1. Identify causes of slow, intermittent, or no power window operation; determine needed action.
2. Inspect and test motors, switches, relays, connectors, terminals, wires, and control components/modules of power window circuits; repair or replace as needed.
3. Inspect and test block heaters; determine needed repairs.
4. Inspect and test engine cooling fan electrical control components/modules, wiring; repair or replace as needed.