C140A

C140A- TRANSFER CASE MOTOR PERFORMANCE





For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


- When Monitored:

With the ignition on and no undervoltage or overvoltage condition present.

- Set Condition:

A faulted condition is detected in the H-bridge driver.







Diagnostic Test


1. DTC IS ACTIVE

Ignition on, engine not running.

With the scan tool, read DTCs in the Final Drive Control Module.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 8


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





Turn the ignition off to the lock position

Disconnect the Transfer Case Motor harness connector.

Disconnect the Final Drive Control Module C1 harness connector.

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. (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

- 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 5
-


5. (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

- 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 6
-


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





Measure the resistance between the (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit at the Transfer Case Motor 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 Transfer Case Verification Test

No

- Go To 7


7. TRANSFER CASE MOTOR

At the Transfer Case Motor, measure the resistance between the (T315) Shift Motor Control A circuit and the (T316) Shift Motor Control B circuit.

Is the resistance below 5.0 ohms?

Yes

- Replace the shorted Transfer Case Motor.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

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


8. 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.