Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
NOTE: If both DTCs C1415 and C140A are present, check the FDCM fuse and the B(+) supply to the Integrated Power Module (IPM).
1. Ignition on, engine not running.
2. With the scan tool, read DTCs in the Final Drive Control Module.
  Pick the answer that best describes the DTC set conditions?
  
  Yes
  - Go To 2
  No
  - Go to step 4
(T315) SHIFT MOTOR CONTROL A CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: CHECKING SHIFT MOTOR CONTROL A CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Disconnect the Transfer Case Motor harness connector.
3. Disconnect the Final Drive Control Module C1 harness connector.
4. Measure the resistance of the (T315) Shift Motor Control A circuit from the Transfer Case Motor harness connector to the Final Drive Control Module C2 harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T315) Shift Motor Control A circuit for an open or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to step 3
(T316) SHIFT MOTOR CONTROL B CIRCUIT OPEN OR HIGH RESISTANCE

Fig 2: CHECKING SHIFT MOTOR CONTROL B CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (T316) Shift Motor Control B circuit from the Transfer Case Motor harness connector to the Final Drive Control Module C2 harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T316) Shift Motor Control B circuit for an open or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
4. 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. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.