C140C

C140C- TRANSFER CASE MOTOR CONTROL CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.

- Set Condition:
The FCM detects high voltage on the Transfer Case Motor Control Circuit for 2 seconds.





Diagnostic Test

1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, read the FCM DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 14

2. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off to the lock position
Disconnect the Shift Motor/Mode Sensor Assembly harness connector.
Remove the Front Control Module (FCM) from the Integrated Power Module (IPM).
Ignition on, engine not running.
Measure the voltage of the (T315) Shift Motor Control A circuit.
Is there any voltage present?

Yes

- Repair the (T315) Shift Motor Control A circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 3


3. (T316) SHIFT MOTOR CONTROL B CIRCUIT SHORTED TO VOLTAGE




Measure the voltage of the (T316) Shift Motor Control B circuit.
Is there any voltage present?

Yes

- Repair the (T316) Shift Motor Control B circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 4


4. SHIFT MOTOR CIRCUIT RESISTANCE AT FCM CONNECTOR




Turn the ignition off to the lock position
Reconnect the Shift Motor/Mode Sensor Assembly harness connector.
Measure the resistance between the (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit in the FCM harness connector of the IPM.
Is the resistance between 40 and 100 ohms?

Yes

- Go to 13

No

- Go to 5

5. (T315) SHIFT MOTOR CONTROL A CIRCUIT OPEN




Disconnect the Shift Motor/Mode Sensor Assembly harness connector.
Measure the resistance of the (T315) Shift Motor Control A circuit between the Shift Motor/Mode Sensor Assembly harness connector and the FCM harness connector in the IPM.
Is the resistance above 5.0 ohms?

Yes

- Go to 6

No

- Go to 7


6. (T315) SHIFT MOTOR CONTROL A CIRCUIT OPEN (IPM)




Disconnect the Integrated Power Module C5 harness connector.
Measure the resistance of the (T315) Shift Motor Control A circuit between the Shift Motor/Mode Sensor Assembly harness connector and the Integrated Power Module C5 harness connector.
Is the resistance above 5.0 ohms?

Yes

- Repair the (T315) Shift Motor Control A circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 12

7. (T316) SHIFT MOTOR CONTROL B CIRCUIT OPEN




Measure the resistance of the (T316) Shift Motor Control B circuit between the Shift Motor/Mode Sensor Assembly harness connector and the FCM harness connector in the IPM.
Is the resistance above 5.0 ohms?

Yes

- Go to 8

No

- Go to 9


8. (T316) SHIFT MOTOR CONTROL B CIRCUIT OPEN (IPM)




Disconnect the Integrated Power Module C5 harness connector.
Measure the resistance of the (T316) Shift Motor Control B circuit between the Shift Motor/Mode Sensor Assembly harness connector and the Integrated Power Module C5 harness connector.
Is the resistance above 5.0 ohms?

Yes

- Repair the (T316) Shift Motor Control B circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 12

9. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B CIRCUIT




Measure the resistance between (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit at the Shift Motor/Mode Sensor Assembly harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 10

No

- Go to 11

10. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B CIRCUIT (IPM)




Disconnect the Integrated Power Module C5 harness connector.
Measure the resistance between (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit at the Shift Motor/Mode Sensor Assembly harness connector.
Is the resistance below 5.0 ohms?

Yes

- Repair the (T315) Shift Motor Control A circuit for a short to the (T316) Shift Motor Control B circuit.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 12

11. SHIFT MOTOR/MODE SENSOR ASSEMBLY
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 TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Replace the Shift Motor/Mode Sensor assembly.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

12. INTEGRATED POWER MODULE
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 TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Replace the Integrated Power Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

13. FRONT CONTROL MODULE
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 TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Replace the Front Control Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

14. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Test complete.