2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 890

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 890

rotate in one direction. When commanded reverse the encoder motor drive gear should rotate in the opposite direction.

瀚慖f the encoder motor drive gear is unable to rotate, test the TCEM.

11. Inspect the transfer case actuator shaft gear for a binding condition. If binding, remove the transfer case and repair the binding condition.

12. Test the TCEM.

Component Testing

TCEM (Transfer Case Encoder Motor) - Lock Solenoid, 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. Using a PU probe J-35616-5, attach the red lead from one of the EL-49741 - harnesses to the battery positive voltage terminal of the TCEM,

pin B.

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

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

瀚慖f you do not hear the TCEM unlock, test the affected circuits of the TCEM harness for an open/high resistance, short to ground or short

together. If all circuits and connections test normal, replace the TCEM.

5. Using a PU probe J-35616-5, attach the red lead from the other EL-49741 - jumper harness to the motor control A terminal of the TCEM, pin

A.

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

7. Touch the battery terminals of the 9-volt battery to the battery terminals of the jumper harness. This should rotate the encoder motor drive

gear in either a clockwise or counterclockwise rotation depending on battery orientation.

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

8. Using the PU probes J 35616-5, test for between 0.3-40 ohm between the motor control A circuit TCEM X1 pin A and the motor control B

circuit TCEM X1 pin D.

瀚慖f greater than the specified range, replace the encoder motor.

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

9. Using the PU probes J 35616-5, test for greater than 10 ohm between the following circuits and the encoder motor case:

* Motor control A, TCEM harness X1 pin A.

* Motor control B, TCEM harness X1 pin D.

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

10. Using the PU probes J 35616-5, test for greater than 1 M ohm between the motor control A circuit, TCEM X1 pin A and all other pins on the

TCEM harness X1 except the motor control B, TCEM X1 pin D.

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

11. Using the PU probes J 35616-5, test for greater than 1 M ohm between the motor control B circuit, TCEM X1 pin D. and all other pins on the

TCEM harness X1 except the motor control A circuit, TCEM X1 pin A.

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

12. Test the TCCM.

TCCM

Note: TCCM's need to be programmed when replaced. If after programming the TCCM comes back as "NO COMM", try reprogramming

again. (Internet/vehicle bandwidth load may cause the programming activity to fail.)

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

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

3. Using the PU probes J 35616-4A, connect a test lamp between the motor control A circuit, TCEM X1 pin A and the ground terminal of

EL-49742 - harness, black terminal.

4. Using the Transfer Case Motor Control function of the Special Function feature of the scan tool, command the motor forward and reverse.

When commanded forward, the test light should illuminate for 10 seconds and turn OFF. When commanded reverse, the test light should turn

OFF.

瀚慖f the test light stays ON when commanded OFF, test the motor control A circuit for a short to voltage. If all circuits and connections test

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

瀚慖f the test light does not illuminate when commanded ON, test the motor control A 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.