C140B

C140B- TRANSFER CASE MOTOR CONTROL CIRCUIT LOW





For a complete wiring diagram Consult Diagrams/Electrical

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

- Set Condition:
FCM detects low voltage on the Transfer Case Motor Control Circuit for 0.5 seconds.





Diagnostic Test

1. DTC IS ACTIVE

NOTE: If both DTCs C140B and C1405 are present, check fuse 8 and fuse 42 in the Integrated Power Module (IPM) before continuing with diagnosis.

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 16

2. SHIFT MOTOR CIRCUIT RESISTANCE




Turn the ignition off to the lock position
Remove the Front Control Module (FCM) from the Integrated Power Module (IPM).
Measure the resistance between the (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit at the FCM connector in the IPM.
Is the resistance between 40 and 100 ohms?

Yes

- Go to 15

No

- Go to 3

3. (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 IPM harness connector.
Is the resistance above 5.0 ohms?

Yes

- Go to 4

No

- Go to 5


4. (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 14

5. (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 6

No

- Go to 7


6. (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 14

7. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (T315) Shift Motor Control A circuit.
Is the resistance below 5.0 ohms?

Yes

- Go to 8

No

- Go to 9


8. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO GROUND (IPM)




Disconnect the Integrated Power Module C5 harness connector.
Measure the resistance between ground and the (T315) Shift Motor Control A circuit.
Is the resistance below 5.0 ohms?

Yes

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

No

- Go to 14

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




Measure the resistance between ground and the (T316) Shift Motor Control B circuit.
Is the resistance below 5.0 ohms?

Yes

- Go to 10

No

- Go to 11


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




Disconnect the Integrated Power Module C5 harness connector.
Measure the resistance between ground 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 (T316) Shift Motor Control B circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 14

11. (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 12

No

- Go to 13

12. (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 14

13. 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

14. 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

15. 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

16. 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.