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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Final Drive Control Module (FDCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0100-Lost Communication With ECM/Pcm >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY DTC IS ACTIVE 
    NOTE:

    Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

    1. Ignition on, engine not running.
    2. With the scan tool, read DTC's.

      Is this DTC active?

      Yes 

      • Go To  2.

      No 

      • Go To  5.
  2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTC's 
    1. With the scan tool, read all active DTC's from all modules.
    2. Check for:
      • TIPM configuration.
      • CAN B or C hardware electrical.
      • VIN Missing/Mismatch.
      • Battery or ignition related DTC's.

      Does the scan tool display any active DTC's to the conditions listed above?

      Yes 

      No 

      • Go To  3.
  3. VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS 
    1. Ignition on, engine not running.
    2. With the scan tool, select Network Diagnostics.
    3. Verify that the PCM is active on the bus.

      Is the PCM active on the bus?

      Yes 

      • Go To  4.

      No 

  4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC's 
    1. With the scan tool, select Network Diagnostics.

      Is there more than one module with active DTC's "Logged Against" the PCM?

      Yes 

      No 

      • Replace the module that set this DTC in accordance with the service information.
      • Perform FDCM VERIFICATION TEST. Refer to FDCM VERIFICATION TEST .
  5. INTERMITTENT WIRING AND CONNECTORS 
    1. The conditions necessary to set this DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
    4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

      Were there any problems found?

      Yes 

      No 

      • Test complete.