2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 932
TCCM
1. Key OFF. Disconnect the TCCM X1 connector.
2. Key ON, engine OFF. Connect the EL-49742 - harness.
3. Test for 7.5-8.5 V between the incremental encoder sensor (8 V) supply pin, TCCM X1-9, and the ground terminal of the EL-49742 -
harness, black terminal.
瀚慖f the outside the specified range, replace TCCM.
4. Test for 7.5-8.5 V between the incremental encoder sensor (8 V) supply pin, TCCM X1-9, and the low reference pin, TCCM X1-10.
瀚慖f the outside the specified range, replace TCCM.
5. Test for 6.0-7.0 V between the incremental encoder impulse signal pin, TCCM X1-3, and the ground terminal of the EL-49742 - harness,
black terminal.
瀚慖f the outside the specified range, replace TCCM.
6. Key OFF. Connect the TCCM X1 connector. Disconnect the TCCM X2 connector.
7. Key OFF. Test for a diagnostic B+ (+0.0/-1.0 V) between the incremental encoder direction pin, TCCM X2-14, and the B+ terminal of the
EL-49742 - harness, red terminal.
瀚慖f the outside the specified range, replace TCCM.
8. Go to Circuit/System Testing.
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 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)
* 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)
MP 3010-NP0 - Transfer Case
DTC C0397
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.
