C1477

C1477-TRANSFER CASE CLUTCH OVERTEMPERATURE





For a complete wiring diagram, refer to the wiring information Electrical Diagrams.

- When Monitored:
Ignition on.

- Set Condition:
The FDCM 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

- Diagnose and repair the DTC(s).

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

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.
- 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 Final Drive Control Module (FDCM).
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Test Complete.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test
.

5. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change 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.