C140D

C140D-TRANSFER CASE MOTOR CONTROL CIRCUIT OPEN





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

- When Monitored:
With the ignition on and no system undervoltage or overvoltage condition present.

- Set Condition:
The Drive Train Control Module (DTCM) detects an open circuit on one of the Transfer Case Shift Motor/Mode Sensor Assembly Control circuits.





1. DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. Test drive the vehicle.
4. Ignition on, engine not running.
5. With the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Go To 7

2. (T315) STEP MOTOR CONTROL A CIRCUIT OPEN




1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Motor harness connector.
3. Disconnect the DTCM C2 harness connector.
4. Measure the resistance of the (T315) Step Motor Control A circuit from the Transfer Case Motor harness connector to the DTCM C2 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (T315) Step Motor Control B circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 3

3. (T316) STEP MOTOR CONTROL B CIRCUIT OPEN




1. Measure the resistance of the (T316) Step Motor Control C circuit from the Transfer Case Motor harness connector to the Final Drive Control Module C2 harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (T316) Step Motor Control C circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 4

4. (T315) STEP MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE




1. Ignition on, engine not running.
2. Measure the voltage of the (T315) Step Motor Control A circuit at the Transfer Case Motor harness connector.

Is the voltage above 0.5 of a volt?

Yes

- Repair the (T315) Step Motor Control A circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 5

5. (T316) STEP MOTOR CONTROL B CIRCUIT SHORTED TO VOLTAGE




1. Measure the voltage of the (T316) Step Motor Control B circuit at the Transfer Case Motor harness connector.

Is the voltage above 0.5 of a volt?

Yes

- Repair the (T316) Step Motor Control B circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 6

6. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY




1. Connect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
2. Measure the resistance between the (T315) Step Motor Control A circuit and the (T316) Step Motor Control B circuit at the Final Drive Control Module C2 harness connector.

Is the resistance below 5.0 Ohms?

Yes

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

No

- Replace the shorted Transfer Case Shift Motor/Mode Sensor Assembly.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

7. 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.
6. Look for the data to change other than as expected or for the DTC to reset.

Were any problems found?

Yes

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

No

- Test complete.