C140C
C140C- TRANSFER CASE MOTOR CONTROL CIRCUIT HIGH
For a complete wiring diagram Refer to Diagrams/Electrical Verification Tests
- When Monitored:
Ignition on. Battery voltage between 9.0 and 16.0 volts.
- Set Condition:
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, 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 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 (T101) Shift Motor (+) circuit.
Is there any voltage present?
Yes
- Repair the (T101) Shift Motor (+) circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No
- Go to 3
-
3. (T102) SHIFT MOTOR (-) CIRCUIT SHORTED TO VOLTAGE
Measure the voltage of the (T102) Shift Motor (-) circuit.
Is there any voltage present?
Yes
- Repair the (T102) Shift Motor (-) circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
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 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 harness connector.
Measure the resistance between the Shift Motor (+) circuit and the Shift Motor (-) circuit.
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 harness connector.
Measure the resistance of the (T101) Shift Motor (+) circuit between the Shift Motor/Mode Sensor Assembly harness connector and the Integrated Power Module C2 harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (T101) Shift Motor (+) circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No
- Go to 7
-
7. (T102) SHIFT MOTOR (-) NEG CIRCUIT OPEN
Measure the resistance of the (T102) Shift Motor (-) circuit from the Shift Motor/Mode Sensor Assembly harness connector to the Integrated Power Module C2 harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (T102) Shift Motor (-) circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No
- Go to 8
-
8. (T101) SHIFT MOTOR (+) POS CIRCUIT SHORTED TO (T102) SHIFT MOTOR - (NEG) CIRCUIT
Measure the resistance between (T101) Shift Motor (+) circuit and the (T102) Shift Motor (-) circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T101) Shift Motor (+) circuit for a short to the (T102) Shift Motor (-) circuit.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
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. Verification Tests
No
- Replace the Shift Motor/Mode Sensor Assembly.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
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. Verification Tests
No
- Replace the Integrated Power Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
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. Verification Tests
No
- Replace the Front Control Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
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. Verification Tests
No
- Test complete.