Mar 28, 2024  
2018 - 2019 Catalog 
    
2018 - 2019 Catalog [ARCHIVED CATALOG]

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HDD 156 - Heavy Duty Diesel Electrical/Electronic Systems Level II

Credits: 4
Practices the service of electrical/electronic systems on heavy duty diesel vehicles. Practices level 2 NATEF tasks related to electrical/electronic systems.

Prerequisite(s): HDD 106  with a minimum grade of “C” (2.0)
Corequisite(s): HDD 151  and HDD 204  
Lecture Hours: 20 Lab Hours: 50
Meets MTA Requirement: None
Pass/NoCredit: Yes

Outcomes and Objectives
  1. Complete Level 2 HDD NATEF tasks related to Battery Service as listed below
    1. Charge battery using appropriate method for battery type.
    2. Inspect, test, and clean battery cables and connectors; repair or replace as needed.
    3. Jump start a vehicle using jumper cables and a booster battery or appropriate auxiliary power supply using proper safety procedures.
    4. Perform battery capacitance test; determine needed action.
    5. Identify and test low voltage disconnect (LVD) systems; determine needed repair.
  2. Complete Level 2 HDD NATEF tasks related to Starting System as listed below.
    1. Perform starter circuit cranking voltage and voltage drop tests; determine needed action.
    2. Inspect and test components (key switch, push button and/or magnetic switch) and wires and harnesses in the starter control circuit; replace as needed.
    3. Inspect and test, starter relays and solenoids/switches; replace as needed.
    4. Remove and replace starter; inspect flywheel ring gear or flex plate.
  3. Complete Level 2 HDD NATEF tasks related to Charging System Diagnosis and Repair as listed below.
    1. Test instrument panel mounted volt meters and/or indicator lamps; determine needed action.
    2. Identify causes of a no charge, low charge, or overcharge problems; determine needed action.
    3. Inspect and replace alternator drive belts, pulleys, fans, tensioners, and mounting brackets; adjust drive belts and check alignment.
    4. Perform charging system voltage and amperage output tests; perform AC ripple test; determine needed action.
    5. Perform charging circuit voltage drop tests; determine needed action.
    6. Remove and replace alternator.
    7. Inspect, repair, or replace cables, wires, and connectors in the charging circuit.
  4. Complete Level 2 HDD NATEF tasks to Related Electrical Systems as listed below.
    1. Identify causes of constant, intermittent, or no horn operation; determine needed action.
    2. Inspect and test horn circuit relays, horns, switches, connectors, wires, clock springs, and control components/modules; repair or replace as needed.
    3. Inspect wiper motor transmission linkage, arms, and blades; adjust or replace as needed.
    4. Inspect and test auxiliary power outlet, integral fuse, connectors, terminals, wires, and control components/modules; repair or replace as needed.
    5. Inspect and test cruise control electrical components; repair or replace as needed.
    6. Inspect and test switches, relays, controllers, actuator/solenoids, connectors, terminals, and wires of electric door lock circuits.
    7. Check operation of keyless and remote lock/unlock devices; determine needed action.



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