C140B
C140B- TRANSFER CASE MOTOR CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Diagrams/Electrical Electrical Diagrams
- 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. SHIFT MOTOR 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 10
2. SHIFT MOTOR CIRCUIT RESISTANCE AT FCM CONNECTOR
Turn the ignition off to the lock position.
Remove the Front Control Module (FCM) from the Power Distribution Module (PDM).
Measure the resistance between the Shift Motor (+) circuit and the Shift Motor (-) circuit in the FCM harness connector of the PDM.
Is the resistance between 40 and 100 ohms?
Yes
- Go to 9
No
- Go to 3
3. SHIFT MOTOR CIRCUIT RESISTANCE AT PDM CONNECTOR
Disconnect the Power Distribution Module (PDM) C2 connector.
Measure the resistance between the Shift Motor (+) circuit and the Shift Motor (-) circuit at the PDM C2 harness connector.
Is the resistance between 40 and 100 ohms?
Yes
- Replace the Power Distribution Module (PDM).
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No
- Go to 4
4. (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 to the Power Distribution 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 5
-
5. (T102) SHIFT MOTOR (-) NEG CIRCUIT OPEN
Measure the resistance of the (T102) Shift Motor (-) circuit between the Shift Motor/Mode Sensor Assembly harness connector to the Power Distribution 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 6
-
6. (T101) SHIFT MOTOR (+) POS CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (T101) Shift Motor (+) circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T101) Shift Motor (+) circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No
- Go to 7
-
7. (T102) SHIFT MOTOR - (NEG) CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (T102) Shift Motor (-) circuit at the Shift Motor/Mode Sensor Assembly harness connector.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T102) Shift Motor (-) circuit for a short to ground.
- 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 at the Shift Motor/Mode Sensor Assembly harness connector.
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
- Replace the Shift Motor/Mode Sensor Assembly.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
9. FRONT CONTROL MODULE (FCM)
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
10. 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.