2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 894

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 894

test the TCCM.

瀚慖f the voltage is less than the specified range, test the affected circuit for an open/high resistance or short to ground. If all circuits and

connections test normal, test the TCCM.

6. Test the TCEM.

Component Testing

Transfer Case Encoder Motor (TCEM) - Actuator Lock, Motor A and Motor B

1. Remove the encoder motor 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. Install EL-49742 - harness.

3. Using a purple probe J-35616-5, attach the red lead from the EL-49742 - jumper harness to the motor control A terminal of the TCEM, pin A.

4. Using a purple probe J-35616-5, touch the black lead from this same jumper harness to the motor control B terminal of the TCEM, pin D.

The encoder motor drive gear should not rotate.

瀚慖f the encoder motor rotates, replace the encoder motor.

5. Disconnect the black lead of theEL-49742 - jumper harness from the motor control B terminal of the TCEM, pin D.

6. Using a purple probe J-35616-5, attach the red lead from the EL-49741 - harness to the battery positive voltage terminal of the TCEM, pin B.

7. Using a purple probe J-35616-5, attach the black lead from this same jumper harness to the lock solenoid control terminal of the TCEM, pin

C.

8. Attach a 9 volt battery to this harness (not included). You should hear the encoder motor unlock.

9. Touch the black lead fromEL-49742 - jumper harness to the motor control B terminal of the transfer case encoder motor, pin D. The encoder

motor drive gear should rotate.

瀚慖f the encoder motor drive gear does not rotate, replace the encoder motor.

10. Using the purple probe J 35616-5, test for between 10-30 ohm between the battery positive voltage circuit TCEM, pin B and the lock

solenoid control circuit TCEM pin C.

瀚慖f outside the specified range, replace the encoder motor.

11. Using the purple probe J 35616-5, test for greater than 1 M ohm between the following circuits and the encoder motor case:

* Battery positive voltage circuit TCEM, pin B.

* Lock solenoid control circuit TCEM pin C.

瀚慖f less than the specified value, replace the encoder motor.

12. Using the purple probe J 35616-5, test for greater than 1 M ohm between the battery positive voltage circuit TCEM, pin B and all other pins

on the TCEM X1 except the lock solenoid control circuit TCEM, pin C.

瀚慖f less than the specified value, replace the encoder motor.

13. Using the purple probe J 35616-5, test for greater than 1 M ohm between the lock solenoid control circuit TCEM, pin C and all other pins on

the TCEM X1 except the battery positive voltage circuit TCEM, pin B.

瀚慖f less than the specified value, replace the encoder motor.

14. Test the TCCM.

Transfer Case Shift Control Module (TCCM)

1. Ignition OFF. Disconnect the X1 harness connector at the TCEM.

2. Ignition ON, engine OFF. Install EL-49742 - harness.

3. Block wheels. Parking brake engaged. Transmission in Neutral.

4. Using the purple probe J 35616-4A, connect a test lamp between the battery positive voltage circuit, TCEM X1 pin B and the ground

terminal of EL-49742 - harness, black terminal. The test light should illuminate.

瀚慖f the test light does not illuminate, test the battery positive voltage circuit for an open or short to ground. If all circuits and connections

test normal, reprogram the TCCM. If the DTC continues to set replace the TCCM.

5. Using the purple probe J 35616-4A, connect a test lamp between the battery positive voltage circuit, TCEM X1 pin B and the lock solenoid

control circuit, TCEM X1 pin C. The test light should not illuminate.

瀚慖f the test light illuminates, test the lock solenoid control circuit for a short to ground. If all circuits and connections test normal,

reprogram the TCCM. If the DTC continues to set replace the TCCM.

6. Using the Transfer Case Lock function of the Special Function feature of the scan tool, command the transfer case lock ON and OFF. When

the lock is commanded ON, release solenoid de-energized, the test light should not illuminate. When the lock is commanded OFF, release