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
Showing posts with label place indexing marks on the encoder motor drive gear and the. Show all posts
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Monday, November 18, 2019
Sunday, November 17, 2019
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 886
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 886
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 purple 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 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.
4. Attach a 9 volt battery to this harness (not included). You will hear the encoder motor unlock.
5. Using a purple probe J-35616-5, attach the red lead from the other jumper EL-49741 - harness to the motor control A terminal of the TCEM,
pin A.
6. Using a purple 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 counter-clockwise rotation depending on battery orientation.
瀚慖f the encoder motor drive gear does not rotate, replace the encoder motor.
8. Using the purple 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 purple 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 purple 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 purple 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
1. Ignition OFF. Disconnect the X1 harness connector at the TCEM.
2. Ignition ON, engine OFF. Install EL-49742 - harness.
3. Using the purple 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.
5. Using the purple probes J 35616-4A, connect a test lamp between the motor control B circuit, TCEM X1 pin D and the ground terminal of
EL-49742 - harness, black terminal.
6. 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 turn OFF. When commanded reverse, the test light should illuminate for 10 seconds and turn
OFF.
瀚慖f the test light stays ON when commanded OFF, test the motor control B 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 B 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.
7. Using the purple probes J 35616-4A, connect a test lamp between the motor control A circuit, TCEM X1 pin A and a good ground.
8. 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/Counter CW, the test light should illuminate dimly for 10 seconds and turn OFF. When commanded
Reverse/Clockwise, the test light should turn OFF.
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 purple 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 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.
4. Attach a 9 volt battery to this harness (not included). You will hear the encoder motor unlock.
5. Using a purple probe J-35616-5, attach the red lead from the other jumper EL-49741 - harness to the motor control A terminal of the TCEM,
pin A.
6. Using a purple 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 counter-clockwise rotation depending on battery orientation.
瀚慖f the encoder motor drive gear does not rotate, replace the encoder motor.
8. Using the purple 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 purple 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 purple 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 purple 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
1. Ignition OFF. Disconnect the X1 harness connector at the TCEM.
2. Ignition ON, engine OFF. Install EL-49742 - harness.
3. Using the purple 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.
5. Using the purple probes J 35616-4A, connect a test lamp between the motor control B circuit, TCEM X1 pin D and the ground terminal of
EL-49742 - harness, black terminal.
6. 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 turn OFF. When commanded reverse, the test light should illuminate for 10 seconds and turn
OFF.
瀚慖f the test light stays ON when commanded OFF, test the motor control B 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 B 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.
7. Using the purple probes J 35616-4A, connect a test lamp between the motor control A circuit, TCEM X1 pin A and a good ground.
8. 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/Counter CW, the test light should illuminate dimly for 10 seconds and turn OFF. When commanded
Reverse/Clockwise, the test light should turn OFF.
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