Please enable JavaScript to view this page.

Heavy Duty Diesel Electrical/Electronic Systems Level III

HDD 206

Heavy Duty Diesel Electrical/Electronic Systems Level III

HDD 206

Course Description

Prerequisites: Prerequisites: HDD 156 with a grade of "C" (2.

0) or better. Corequisites: HDD 202 and HDD 205. Practices the diagnostic and repair of electrical/electronic systems on heavy duty diesel vehicles. Practices Level 3 NATEF tasks related to heavy duty diesel electrical/electronic systems. (20-50)

Outcomes and Objectives

Complete Level 3 HDD NATEF tasks related to Lighting Systems as listed below.

Objectives:

  • Interface with vehicle’s on-board computer; perform diagnostic procedures using recommended electronic service tool(s) (including PC based software and/or data scan tools); determine needed action.
  • Identify causes of brighter than normal, intermittent, dim, or no headlight and daytime running light (DRL) operation.
  • Test, aim, and replace headlights.
  • Test headlight and dimmer circuit switches, relays, wires, terminals, connectors, sockets, and control components/modules; repair or replace as needed.
  • Inspect and test switches, bulbs/LEDs, sockets, connectors, terminals, relays, wires, and control components/modules of parking, clearance, and taillight circuits; repair or replace as needed.
  • Inspect and test instrument panel light circuit switches, relays, bulbs/LEDs, sockets, connectors, terminals, wires, and printed circuits/control modules; repair or replace as needed.
  • Inspect and test interior cab light circuit switches, bulbs/LEDs, sockets, low voltage disconnect (LVD), connectors, terminals, wires, and control components/modules; repair or replace as needed.
  • Inspect and test tractor-to-trailer multi-wire connector(s); repair or replace as needed.
  • Inspect, test, and adjust stoplight circuit switches, bulbs/LEDs, sockets, connectors, terminals, wires and control components/modules; repair or replace as needed.
  • Inspect and test turn signal and hazard circuit flasher(s), switches, relays, bulbs/LEDs, sockets, connectors, terminals, wires and control components/modules; repair or replace as needed.
  • Inspect and test reverse lights and warning device circuit switches, bulbs/LEDs, sockets, horns, buzzers, connectors, terminals, wires and control components/modules; repair or replace as needed.

Complete Level 3 HDD NATEF tasks related to Gauges and Warning Devices as listed below.

Objectives:

  • Interface with vehicle’s on-board computer; perform diagnostic procedure, verify instrument cluster operations using recommended electronic service tool(s) (including PC based software and/or data scan tools); determine needed action.
  • Identify causes of intermittent, high, low, or no gauge readings; determine needed action.
  • Identify causes of data bus-driven gauge malfunctions; determine needed action.
  • Inspect and test gauge circuit sensor/sending units, gauges, connectors, terminals, and wires; repair or replace as needed.
  • Inspect and test warning devices (lights and audible) circuit sensor/sending units, bulbs/LEDs, sockets, connectors, wires, and control components/modules; repair or replace as needed.
  • Inspect, test, replace, and calibrate (if applicable) electronic speedometer, odometer, and tachometer systems.

Complete Level 3 HDD NATEF tasks related to Electrical Systems as listed below.

Objectives:

  • Interface with vehicle’s on-board computer; perform diagnostic procedures using recommended electronic service tool(s) (including PC based software and/or data scan tools); determine needed action.
  • Identify causes of constant, intermittent, or no wiper operation; diagnose the cause of wiper speed control and/or park problems; determine needed action.
  • Inspect and test wiper motor, resistors, park switch, relays, switches, connectors, wires and control components/modules; repair or replace as needed.
  • Inspect and test windshield washer motor or pump/relay assembly, switches, connectors, terminals, wires, and control components/modules; repair or replace as needed.
  • Inspect and test side view mirror motors, heater circuit grids, relays, switches, connectors, terminals, wires and control components/modules; repair or replace as needed.
  • Inspect and test heater and A/C electrical components including: A/C clutches, motors, resistors, relays, switches, connectors, terminals, wires, and control components/modules; repair or replace as needed.
  • Identify causes of data bus communication problems; determine needed action.