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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  TEST FOR INTERMITTENT CONDITION 

    Turn the ignition on.

    With the scan tool, record and erase FCM DTC's.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read active FCM DTC's.

    Does the scan tool display this DTC as active? 

    Yes 

    1. Go To  2).

    No 

    1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  2. 2)  ANY CAN B BUS MODULE- INTERNAL FAULT 

    Turn the ignition off.

    With the scan tool, monitor the active FCM DTCs.

    While monitoring the scan tool, disconnect each CAN B Bus module one at a time.

    NOTE: When performing the above step, turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on.
    NOTE: This is to determine if the fault is internal within a module.

    Check for this DTC to become active after disconnecting each CAN B Bus module the vehicle is equipped with.

    NOTE: If the DTC becomes stored when a particular CAN B Bus module is disconnected, that module is causing the DTC to set.

    With all the CAN B Bus modules disconnected did the FCM still set this DTC as active? 

    Yes 

    1. Go To  3).

    No 

    1. Replace the module that when disconnected the DTC became stored.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .
  3. 3)  (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking CAN B BUS (+) Circuit
    GC0015727Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Front Control Module C1 harness connector.

    NOTE: Ensure each CAN B Bus module is disconnected at this time.

    Turn the ignition on.

    Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

    Is the voltage above 10.0 volts? 

    Yes 

    1. Repair the (D55) CAN B Bus (+) circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To  4).
  4. 4)  (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Checking CAN B BUS (-) Circuit
    GC0015728Courtesy of DAIMLERCHRYSLER CORP.
    NOTE: Ensure each CAN B Bus module is disconnected at this time.

    Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

    Is the voltage above 10.0 volts? 

    Yes 

    1. Repair the (D54) CAN B Bus (-) circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To  5).
  5. 5)  (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND 
    Fig 3: Checking CAN B BUS (+) Circuit
    GC0015729Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    NOTE: Ensure each CAN B Bus module is disconnected at this time.

    Measure the resistance between ground and the (D55) CAN B Bus (+) circuit.

    Is the resistance above 1000.0 ohms? 

    Yes 

    1. Go To  6).

    No 

    1. Repair the (D55) CAN B Bus (+) circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .
  6. 6)  (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND 
    Fig 4: Checking CAN B BUS (-) Circuit
    GC0015730Courtesy of DAIMLERCHRYSLER CORP.
    NOTE: Ensure each CAN B Bus module is disconnected at this time.

    Measure the resistance between ground and the (D54) CAN B Bus (-) circuit.

    Is the resistance above 1000.0 ohms? 

    Yes 

    1. Go To  7).

    No 

    1. Repair the (D54) CAN B Bus (-) circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .
  7. 7)   (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT 
    Fig 5: Checking CAN B BUS (+) Circuit & CAN B BUS (-) Circuit
    GC0015731Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) CAN B Bus (-) circuit.

    NOTE: Ensure each CAN B Bus module is disconnected at this time.

    Is any resistance present? 

    Yes 

    1. Repair the (D55) CAN B Bus (+) circuit for a short to the (D54) CAN B Bus (-) circuit.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To  8).
  8. 8)   (D55) CAN B BUS (+) CIRCUIT OPEN 
    Fig 6: Checking CAN B BUS (+) Circuit
    GC0015732Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (D55) CAN B Bus (+) circuit between the FCM connector and the Cluster connector.

    Is the resistance above 10.0 ohms? 

    Yes 

    1. Repair the (D55) CAN B Bus (+) circuit for an open or high resistance.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Go To  9).
  9. 9)   (D54) CAN B BUS (-) CIRCUIT OPEN 
    Fig 7: Checking CAN B BUS (-) Circuit
    GC0015733Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (D54) CAN B Bus (-) circuit between the FCM connector and the Cluster connector.

    Is the resistance above 10.0 ohms? 

    Yes 

    1. Repair the (D54) CAN B Bus (-) circuit for an open or high resistance.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Replace and program the Front Control Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1.(Refer to BODY VERIFICATION TEST - VER 1) .
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