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Diagnostic Test

  1. 1) CHECK THE STATUS OF THE ERROR MESSAGE 
    NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be displayed.
    NOTE: Ensure the scan tool is updated to the latest software.

    With the scan tool, record the error message.

    Disconnect the scan tool from the DLC.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    Does the scan tool display this same error message? 

    Yes 

    1. Go to step  2).

    No 

    1. The conditions that caused this error message to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  2. 2) (D71) DIAGNOSTIC CAN C (-) CIRCUIT OPEN 
    Fig 1: Checking CAN C Diagnostic (-) Circuit Between FCM Connector And DLC For Open
    GC0015740Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Front Control Module C1 harness connector.

    Disconnect the scan tool from the DLC.

    Measure the resistance of the (D71) Diagnostic CAN C (-) circuit between the FCM connector and the DLC.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Front Control Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Repair the (D71) Diagnostic CAN C (-) circuit for an open.
    2. Perform BODY VERIFICATION TEST .
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