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Home › Ford › 2007 › Freestar Base, 4.2 2 › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Module Communications Network System › Diagnostic Tests › Communications Network › Inspection and Verification

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Bussed electrical center (BEC) fuse(s):
      • 8 (40A) (no communication with anti-lock brake system [ABS] module)
      • 12 (40A) (no communication with ABS)
      • 40 (15A) (no communication with powertrain control module [PCM])
      • 49 (10A) (no communication with PCM)
      • 51 (10A) (no communication with driver seat module [DSM])
      • 58 (30A) (no communication with smart junction box [SJB])
      • 62 (30A) (no communication with SJB)
      • 65 (30A) (no communication with SJB)
    • Smart junction box (SJB) fuse(s)
      • 8 (10A) (no communication with instrument cluster, electronic automatic temperature control [EATC] module)
      • 11 (5A) (no communication with power sliding door [PSD] module, power liftgate module, no power to scan tool)
      • 12 (5A) (no communication with EATC module)
      • 13 (5A) (no communication with PSD module, power liftgate module, parking aid module, climate controlled seat module)
      • 17 (10A) (no communication with restraints control module [RCM])
      • 18 (10A) (no communication with ABS, speed control actuator)
      • 19 (5A) (no communication with instrument cluster)
    • 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 P , 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) Index. 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) INDEX

DTC Description Source Action
U0073 Control Module Communication Buss Off Anti-lock brake system (ABS) Module REPAIR all other DTCs first. If DTC is still present Go to Pinpoint Test B .
U1262 SCP Communication Bus Fault Instrument Cluster For module that failed network test, go to Symptom Chart .
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 .
U1950 UBP Communication Bus Fault Driver seat module (DSM) For module that failed network test, go to Symptom Chart .
U2023 Fault Received From External Node Instrument cluster RETRIEVE and FOLLOW non-network DTCs from other modules.
All other DTCs - - REFER to MULTIFUNCTION ELECTRONIC MODULES article.
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