C1477

C1477-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, read DTCs in the ABS Module.

Are there any ABS DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 2

2. VERIFY THE DTC IS ACTIVE
1. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 3

No

- Go To 6

3. VERIFY SET CONDITION

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

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

Is the status Active for this DTC?

Yes

- Go To 4

No

- Go To 6

4. (K504) DRIVE TRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Motor C2 harness connector.
3. Disconnect the DTCM harness connector.
4. Measure the resistance between ground and the (K504) Drive Train 5 Volt Supply circuit in the DTCM harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (K504) Drive Train 5 Volt Supply circuit for a short to ground.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Go To 5

5. DRIVE TRAIN CONTROL MODULE (DTCM)
1. Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit.

Were any problems found?

Yes

- Repair as necessary.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

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

6. 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 DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Test Complete.