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Heavy Duty Diesel Electrical/Electronic Systems Level I

HDD 106

Heavy Duty Diesel Electrical/Electronic Systems Level I

HDD 106

Course Description

Corequisites: HDD 108 and HDD 112. Introduces basic electrical/electronic systems on heavy duty diesel vehicles. Practices NATEF tasks related to electrical/electronic systems. (20-50)

Outcomes and Objectives

Complete general HDD electrical and electronic systems level I NATEF tasks as listed below.

Objectives:

  • 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.

Objectives:

  • 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.

Objectives:

  • 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.