C1477

C1477-TRANSFER CASE CLUTCH OVER TEMPERATURE







- 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

- Perform the appropriate diagnostic procedure. Testing and Inspection.

No

- Go To 2

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

Is the status Active for this DTC?

Yes

- Go To 3

No

- Go To 6

3. VERIFY SET CONDITION

NOTE: Check with customer on the driving terrain when the code set (e.g. mud, sand, snow).

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 Shift Motor/Mode Sensor Assembly harness connector.
3. Disconnect the DTCM harness connector.
4. Measure the resistance between ground and the (K504) Drive Train 5-volt Supply circuit.

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).
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

6. INTERMITTENT WIRING HARNESS AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times (if equipped).
6. 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 DTCM VERIFICATION TEST DTCM Verification Test.

No

- Test Complete.