C1477

C1477-4B-TRANSFER CASE CLUTCH - OVER TEMPERATURE

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Ignition on.

- Set Condition:
The Drive Train Control Module (DTCM) detects an overheat condition due to excessive difference in speed across the Transfer Case from hard driving conditions (Mud, Sand, Snow, 2WD Chassis dynamometer etc.).





1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DTCS PRESENT
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs in the ABS Module.

Are there any ABS DTCs present?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection.

No

- Go To 2

2. DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 3

No

- Go To 5

3. AMBIENT TEMPERATURE SENSOR
1. With the scan tool, monitor the ambient temperature in the Totally Integrated Power Module (TIPM).

Is the ambient temperature at room temperature?

Yes

- Go To 4

No

- Replace the Ambient Temperature Sensor. Ambient Temperature Sensor - Removal.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

4. VERIFY SET CONDITION

NOTE: Check with customer on driving terrain (e.g. mud, sand, snow) for set condition.

1. With the scan tool, erase DTCs.
2. Allow the Transfer Case to cool down.
3. Test drive vehicle on dry paved road.
4. With the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Replace the Drive Train Control Module (DTCM). Drivetrain Control Module - Removal.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

5. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.