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Pinpoint Test Ad: DTC U0100 - Lost Communication With ECM/Pcm

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
  1. AD1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Is DTC B1318 recorded? 
    1. YES  : Go to Pinpoint Test AB .
    2. NO  : Go to  AD2.
  2. AD2 CHECK THE INSTRUMENT CLUSTER (IC) CONTINUOUS MEMORY DTCs 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) Self-Test
    • Clear the DTCs. Repeat the instrument cluster (IC) self-test.
    • Is DTC U0100 retrieved again? 
    1. YES  : Go to  AD3.
    2. NO  : The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  3. AD3 CHECK OTHER MODULES FOR DTC U0100 
    • Enter the following diagnostic mode on the diagnostic tool: ABS Module or Restraints Control Module (RCM) Self-Test
    • Carry out the self-test for other modules on the HS-CAN. The ABS module and RCM, for example, communicate on the HS-CAN.
    • Is DTC U0100 retrieved from any other module? 
    1. YES  : Go to  AD4.
    2. NO  : Go to  AD5.
  4. AD4 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  5. AD5 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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