Please enable JavaScript to view this page.

Heavy Duty Diesel Electrical/Electronic Systems Level II

HDD 156

Heavy Duty Diesel Electrical/Electronic Systems Level II

HDD 156

Course Description

Prerequisite: HDD 106 with a grade of "C" (2.0) or better. Corequistes: HDD 151 and HDD 204. Practices the service of electrical/electronic systems on heavy duty diesel vehicles. Practices level 2 NATEF tasks related to electrical/electronic systems. (20-50)

Outcomes and Objectives

Complete Level 2 HDD NATEF tasks related to Battery Service as listed below

Objectives:

  • Charge battery using appropriate method for battery type.
  • Inspect, test, and clean battery cables and connectors; repair or replace as needed.
  • Jump start a vehicle using jumper cables and a booster battery or appropriate auxiliary power supply using proper safety procedures.
  • Perform battery capacitance test; determine needed action.
  • Identify and test low voltage disconnect (LVD) systems; determine needed repair.

Complete Level 2 HDD NATEF tasks related to Starting System as listed below.

Objectives:

  • Perform starter circuit cranking voltage and voltage drop tests; determine needed action.
  • Inspect and test components (key switch, push button and/or magnetic switch) and wires and harnesses in the starter control circuit; replace as needed.
  • Inspect and test, starter relays and solenoids/switches; replace as needed.
  • Remove and replace starter; inspect flywheel ring gear or flex plate.

Complete Level 2 HDD NATEF tasks related to Charging System Diagnosis and Repair as listed below.

Objectives:

  • Test instrument panel mounted volt meters and/or indicator lamps; determine needed action.
  • Identify causes of a no charge, low charge, or overcharge problems; determine needed action.
  • Inspect and replace alternator drive belts, pulleys, fans, tensioners, and mounting brackets; adjust drive belts and check alignment.
  • Perform charging system voltage and amperage output tests; perform AC ripple test; determine needed action.
  • Perform charging circuit voltage drop tests; determine needed action.
  • Remove and replace alternator.
  • Inspect, repair, or replace cables, wires, and connectors in the charging circuit.

Complete Level 2 HDD NATEF tasks to Related Electrical Systems as listed below.

Objectives:

  • Identify causes of constant, intermittent, or no horn operation; determine needed action.
  • Inspect and test horn circuit relays, horns, switches, connectors, wires, clock springs, and control components/modules; repair or replace as needed.
  • Inspect wiper motor transmission linkage, arms, and blades; adjust or replace as needed.
  • Inspect and test auxiliary power outlet, integral fuse, connectors, terminals, wires, and control components/modules; repair or replace as needed.
  • Inspect and test cruise control electrical components; repair or replace as needed.
  • Inspect and test switches, relays, controllers, actuator/solenoids, connectors, terminals, and wires of electric door lock circuits.
  • Check operation of keyless and remote lock/unlock devices; determine needed action.