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C140A







C140A-TRANSFER CASE MOTOR PERFORMANCE
For a complete wiring diagram, refer to Wiring Diagram Information.
^ 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.

Possible Causes
- FINAL DRIVE CONTROL MODULE (FDCM) FUSE
- (A909) FUSED B(+) CIRCUIT FOR VOLTAGE
- (A909) FUSED B(+) CIRCUIT FOR AN OPEN
- (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE
- (T316) SHIFT MOTOR CONTROL B CIRCUIT SHORTED TO VOLTAGE
- (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO GROUND
- (T316) SHIFT MOTOR CONTROL B CIRCUIT SHORTED TO GROUND
- (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B CIRCUIT
- TRANSFER CASE MOTOR
- FINAL DRIVE CONTROL MODULE

Diagnostic Test

1. CHECK DTC CONDITIONS

NOTE: If both DTCs C140A and C1415 are present, check the FDCM fuse and B(+) supply to the Integrated Power Module (IPM) before continuing with diagnosis.

Ignition on, engine not running.
With the scan tool, read DTCs in the Final Drive Control Module.

Pick the answer that best describes DTC condition?

If DTCs C140A and C1415 are both present,
Go to 2

If DTC C140A is active,
Go to 4

If DTC C140A is stored (not active),
Go to 10

2. (A909) FUSED B(+) CIRCUIT FOR VOLTAGE






Turn the ignition off to the lock position
Disconnect the FDCM C1 harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the (A909) Fused B(+) circuit in the FDCM harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?
Yes
Go to 4

No
Go to 3

3. (A909) FUSED B(+) CIRCUIT FOR AN OPEN






Turn the ignition off to the lock position
Disconnect the IPM C1 harness connector.
Measure the resistance of the (A909) Fused B(+) circuit between the IPM C1 harness connector and the FDCM C1 harness connector.

Is the resistance above 5.0 ohms?
Yes
Repair the (A909) Fused B(+) circuit for an open.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1

No
Replace the Integrated Power Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1

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





Turn the ignition off.
Disconnect the Transfer Case Motor harness connector.
Disconnect the Final Drive Control Module C1 harness connector.
Turn the ignition on.
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 5

5. (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 6

6. (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 7

7. (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 8

8. (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.

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 9

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

No >>
Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1

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. Transfer Case Verification Test
No >> Test complete.
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