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Inspection and Verification

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Central junction box (CJB) fuse(s):
      • 1 (10A) (instrument cluster)
      • 3 (7.5A) (driver seat module [DSM])
      • 5 (7.5A) (electronic automatic temperature control [EATC] module)
      • 13 (10A) (EATC module)
      • 14 (10A) (ABS)
      • 15 (5A) (instrument cluster)
      • 18 (10A) (vehicle security module [VSM], parking aid module)
      • 19 (10A) (RCM)
      • 21 (15A) (instrument cluster)
      • 27 (5A) (instrument cluster)
      • 41 (20A) (no power to scan tool)
      • 103 (20A) (anti-lock brake system [ABS] module)
      • 107 (30A) (VSM)
      • 109 (30A) (DSM)
      • 112 (40A) (ABS)
    • Data link connector (DLC)
    • Circuitry
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
    NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
  4. If the cause is not visually evident, connect the scan tool to the DLC.

    If the scan tool does not communicate with the VCM: 

    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Go to Pinpoint Test L , to diagnose no power to the scan tool.
    5. NOTE: During the network test, the scan tool will first attempt to communicate with the PCM, after establishing communication with the PCM, the scan tool will then attempt to communicate with all other modules on the vehicle.
  5. Carry out the network test.
    • If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
    • If the network test fails, go to Symptom Chart  to identify the module not communicating.
  6. If the DTCs retrieved are related to the concern, go to the Communication Network Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  7. If no DTCs related to the concern are retrieved, go to Symptom Chart .
    NOTE: DTC U1900 will set in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module.
    COMMUNICATION NETWORK DIAGNOSTIC TROUBLE CODES (DTC) CHART

    DTC Description Source Action
    U0073 Control Module Communication Buss Off Anti-lock brake system (ABS) module The module could not communicate on the network at a point in time. The fault is not currently present. CLEAR the DTC. REPEAT the network test with scan tool.
    U0100 Lost Communication With ECM/PCM ABS module CLEAR the DTC. REPEAT the network test with scan tool. FOLLOW the appropriate pinpoint test for the module which fails the network test.
    U0102 Lost Communication With Transfer Case Control Module (4x4CM) ABS module CLEAR the DTC. REPEAT the network test with scan tool. FOLLOW the appropriate pinpoint test for the module which fails the network test.
    U1900 CAN Communication Bus Fault-Recieve Error ABS module For module that failed network test, go to Symptom Chart .
    U1900 CAN Communication Bus Fault-Recieve Error Instrument cluster For module that failed network test, go to Symptom Chart .
    U1900 CAN Communication Bus Fault-Receive Error Four wheel drive (4WD) control module For module that failed network test, go to Symptom Chart .
    U1950 UBP Communication Bus Fault Driver seat module (DSM) For module that failed network test, go to Symptom Chart .
    U1950 UBP Communication Bus Fault Instrument cluster For module that failed network test, go to Symptom Chart .
    U2023 Fault Received From External Node ABS module RETRIEVE and FOLLOW non-network DTCs from other modules. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
    U2023 Fault Received From External Node 4WD control module RETRIEVE and FOLLOW non-network DTCs from other modules. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
    U2023 Fault Received From External Node Instrument cluster RETRIEVE and FOLLOW non-network DTCs from other modules. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
    U2226 UBP Invalid Data From Node ID $10 [PCM] Vehicle security module (VSM) RETRIEVE and FOLLOW non-network DTCs from the PCM. REFER to the INTRODUCTION - GASOLINE ENGINES article.
    U2306 UBP Invalid Data From Node ID $60 [Instrument Cluster] DSM RETRIEVE and FOLLOW non-network DTCs from the Instrument cluster. REFER to INSTRUMENT CLUSTER article.
    U2471 Unexpected PRNDL State DSM RETRIEVE and FOLLOW non-network DTCs from other modules. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
    All other DTCs - - REFER to MULTIFUNCTION ELECTRONIC MODULES article.
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