C140C

C140C- TRANSFER CASE MOTOR CONTROL CIRCUIT HIGH





For a complete wiring diagram, refer to Wiring Diagram Information.
^ When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.
^ Set Condition:
FCM detects high voltage on the Transfer Case Motor Control Circuit for 2 seconds.

Possible Causes
- INTERMITTENT CONDITION
- (T101) SHIFT MOTOR + (POS) CIRCUIT SHORTED TO VOLTAGE
- (T102) SHIFT MOTOR - (NEG) CIRCUIT SHORTED TO VOLTAGE
- (T101) SHIFT MOTOR + (POS) CIRCUIT OPEN
- (T102) SHIFT MOTOR - (NEG) CIRCUIT OPEN
- (T101) SHIFT MOTOR + (POS) CIRCUIT SHORTED TO (T102) SHIFT MOTOR ? (NEG) CIRCUIT
- SHIFT MOTOR/MODE SENSOR ASSEMBLY
- INTEGRATED POWER MODULE
- FRONT CONTROL MODULE

Diagnostic Test
1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs.
Move the Shift control to each position, while monitoring the Data Display on the scan tool.
Does the DTC reset?
Yes >>Go to 2
No >>Go to 12

2. (T101) SHIFT MOTOR (+) CIRCUIT SHORTED TO VOLTAGE





Turn the ignition off.
Disconnect the Shift Motor/Mode Sensor Assembly connector.
Remove the Front Control Module (FCM) from the Integrated Power Module (IPM).
Turn the ignition on.
Measure the voltage of the (T101) Shift Motor (+) circuit at the Shift Motor/Mode Sensor Assembly connector.
Is there any voltage present?
Yes >>Repair the (T101) Shift Motor (+) circuit for a short to volt age.
Perform the TRANSFER CASE VERIFICATION TEST VER 1. Transfer Case Verification Test
No >>Go to 3

3. (T102) SHIFT MOTOR (-) CIRCUIT SHORTED TO VOLTAGE





Measure the voltage of the (T102) Shift Motor (-) circuit at the Shift Motor/Mode Sensor Assembly connector.
Is there any voltage present?
Yes >>Repair the (T102) Shift Motor (-) circuit for a short to volt age.
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.
Connect the Shift Motor/Mode Sensor Assembly connector.
Measure the resistance between the Shift Motor (+) circuit and the Shift Motor (-) circuit in the FCM connector of the IPM.
Is the resistance between 40 and 100 ohms?
Yes >>Go to 11
No >>Go to 5

5. SHIFT MOTOR CIRCUIT RESISTANCE AT IPM CONNECTOR





Disconnect the Integrated Power Module (IPM) C2 connector. Measure the resistance between the Shift Motor (+) circuit and the Shift Motor (-) circuit at the IPM C2 connector.
Is the resistance between 40 and 100 ohms?
Yes >>Go to 10
No >>Go to 6

6. (T101) SHIFT MOTOR + (POS) CIRCUIT OPEN





Disconnect the Shift Motor/Mode Sensor Assembly connector. Measure the resistance of the (T101) Shift Motor + (pos) circuit from the Shift Motor/Mode Sensor Assembly connector to the Integrated Power Module C2 connector.
Is the resistance above 5.0 ohms?
Yes >>Repair the (T101) Shift Motor + (pos) circuit for an open.
Perform the TRANSFER CASE VERIFICATION TEST VER 1. Transfer Case Verification Test
No >>Go to 7

7. (T102) SHIFT MOTOR-(NEG) CIRCUIT OPEN





Measure the resistance of the (T102) Shift Motor-(neg) circuit from the Shift Motor/Mode Sensor Assembly connector to the Integrated Power Module C2 connector.
Is the resistance above 5.0 ohms?
Yes >>Repair the (T102) Shift Motor-(neg) circuit for an open.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test
No >>Go to 8

8. (T101) SHIFT MOTOR + (POS) CIRCUIT SHORTED TO (T102) SHIFT MOTOR-(NEG) CIRCUIT





Measure the resistance between (T101) Shift Motor + (pos) circuit and the (T102) Shift Motor-(neg) circuit at the Shift Motor/Mode Sensor Assembly connector.
Is the resistance below 5.0 ohms?
Yes >>Repair the (T101) Shift Motor + (pos) circuit for a short to the (T102) Shift Motor-(neg) circuit.
Perform the TRANSFER CASE VERIFICATION TEST VER 1. Transfer Case Verification Test
No >>Go to 9

9. 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 in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

10. 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 in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

11. 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 in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

12. 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.