2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 907

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 907

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming

* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related

Diagnostic Procedures/MP 3010-NP0/Transfer Case High/Low Clutch Reset)

* Four-Wheel Drive Does Not Engage (See: Transmission and Drivetrain/Differential Assembly/Testing and Inspection/Front Drive

Axle/Four-Wheel Drive Does Not Engage)

* Four-Wheel Drive Does Not Disengage (See: Transmission and Drivetrain/Differential Assembly/Testing and Inspection/Front Drive

Axle/Four-Wheel Drive Does Not Disengage)

* Front Drive Axle Actuator Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids -

Transmission and Drivetrain/Actuators and Solenoids - Differential/Actuator/Service and Repair)

MP 3023/3024-NQH - Transfer Case

DTC C0379

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0379 01

- Front Axle System Short to Battery

DTC C0379 02

- Front Axle System Short to Ground

DTC C0379 04

- Front Axle System Open Circuit

DTC C0379 08

- Front Axle Switch Circuit Signal Invalid

Diagnostic Fault Information

Circuit/System Description

The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator motor

consists of a permanent magnetic motor, a worm gear controlled plunger, a front axle switch and an electronic control circuit within the actuator

assembly.

The front axle actuator consists of the following circuits:

* An Ignition 1 voltage circuit

* An axle switch signal circuit

* An axle actuator control circuit

* A ground circuit

When a shift to 4WD Auto, 4WD HI, or 4WD LO is requested, the transfer case shift control module (TCCM) engages the front axle by grounding