Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
  NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, select ECU view.
  NOTE: A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go to step 2
  No
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking Fused B(+) Circuit Open Or Shorted
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Final Drive Control Module harness connectors.
3. Using a 12-volt test light connected to ground, check each Fused B(+) circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go to step 3
  No
  - Repair the Fused B(+) circuit for an open or short.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
GROUND CIRCUIT OPEN

Fig 2: Checking Ground Circuit For Open
Courtesy of CHRYSLER LLC
1. Using a 12-volt test light connected to 12-volts, check each Ground circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go to step 4
  No
  - Repair the ground circuit for an open.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
(F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Checking Fused Run Relay Output Circuit For Open Or Shorted
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F921) Fused Run Relay Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 5
  No
  - Repair the (F921) Fused Run Relay Output circuit for an open or short.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
(D65) CAN C BUS (+) CIRCUIT OPEN

Fig 4: Checking Can C Bus (+) Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C1 harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the FCM connector and the FDCM connector.
  Is resistance below 5.0 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the (D65) CAN C Bus (+) circuit for an open.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
(D64) CAN C BUS (-) CIRCUIT OPEN

Fig 5: Checking Can C Bus (-) Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D64) CAN C Bus (-) circuit between the FCM connector and the FDCM connector.
  Is resistance below 5.0 ohms?
  
  Yes
  - Replace the Final Drive Control Module in accordance with the Service Information.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure
  No
  - Repair the (D64) CAN C Bus (-) circuit for an open.
  - Perform the FDCM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure