2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 939

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 939

1. Remove the TCEM from transfer case. Using a paint pen or marker, place indexing marks on the encoder motor drive gear and the

mounting surface of the encoder motor.

2. Attach the TCEM to the TCEM connector.

3. Key ON, engine OFF.

Note: Pressing the exit button on the scan tool between commanding the Transfer Case Motor Control forward and reverse is critical to

proper diagnosis. Pressing the exit button changes the commanded state to NONE. If you DO NOT press the exit button between

changing directions, the Incremental Position Sensor parameter may not update. When this happens you have to command the new

direction a second time in order for the scan tool to update. Repeatedly changing directions may cause the Incremental Position Sensor

parameter to flip extremes, -150掳 to +360掳 / +360掳 to -150掳.

4. While monitoring the Incremental Position Sensor parameter, command the TCEM forward using the Transfer Case Motor Control

function of the scan tool. After 10 seconds the Incremental Position Sensor parameter should read -150掳 or +360掳. Push the exit button on

the scan tool once to return the commanded state to NONE. Command the TCEM reverse. After 10 seconds the Incremental Position

Sensor should read +360掳 or -150掳.

瀚慖f the Incremental Position Sensor parameter does not display as described, repeat step 4. If the Incremental Position Sensor parameter

continues to not display as described, replace the TCEM.

5. Key OFF. Install the TCEM.

6. Key OFF for at least 3 minutes.

7. Key ON, engine OFF. The TCCM should relearn the TCEM position and the Transfer Case Position parameter should display a valid

mode.

瀚慖f the Transfer Case Position parameter displays Invalid, perform the 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) procedure.

Repair Instructions

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

* Transfer Case Disassemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Transfer Case Disassemble)

* Transfer Case Two/Four Wheel Drive Actuator Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and

Solenoids - Transmission and Drivetrain/Actuators and Solenoids - Transfer Case/Transfer Case Actuator/Service and Repair/MP 3010-NP0

- Transfer Case/Transfer Case Two/Four Wheel Drive Actuator Replacement)

* Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement (See: Powertrain Management/Transmission Control

Systems/Actuators and Solenoids - Transmission and Drivetrain/Actuators and Solenoids - Transfer Case/Transfer Case Actuator/Service and

Repair/MP 3010-NP0 - Transfer Case/Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement)

MP 3023/3024-NQH - Transfer Case

DTC C0398

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 Descriptor

DTC C0398 5A

- Incremental Sensor - Rotational Position Sensor Correlation Plausibility Failure

Typical Scan Tool Data