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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. AI1 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 AG .
    2. NO  : Go to  AI2.
  2. AI2 CHECK THE INSTRUMENT CLUSTER (IC) CONTINUOUS MEMORY DTCs 
    • Key in ON position.
    • Clear the DTCs.
    • Repeat the instrument cluster (IC) self-test.
    • Is DTC U0100 retrieved again? 
    1. YES  : Go to  AI3.
    2. NO  : The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  3. AI3 CHECK OTHER MODULES FOR DTC U0100 
    • Carry out the self-test for other modules on the HS-CAN. The anti-lock brake system (ABS) module and restraints control module (RCM), for example, communicate on the HS-CAN.
    • Is DTC U0100 retrieved from any other module? 
    1. YES  : Go to  AI4.
    2. NO  : Go to  AI5.
  4. AI4 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 - 2.3L article, ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article or ELECTRONIC ENGINE CONTROLS - HYBRID 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. AI5 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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