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Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of electrical damage.
    • If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    VISUAL INSPECTION CHART

    Electrical
    • Battery Junction Box (BJB) fuse(s):
      • 7 (30A) (no communication with the audio DSP module)
      • 12 (20A) (no communication with ABS module)
      • 23 (7.5A) (no communication with PCM)
      • 32 (30A) (no communication with DSM)
      • 34 (30A) (no communication with LTM)
      • 37 (10A) (no communication with PCM, 3.5L)
      • 47 20A) (no communication with PCM)
    • Smart Junction Box (SJB) fuse(s):
      • 5 (10A) (no communication with SJB)
      • 11 (10A) (no communication with 4X4 control module)
      • 13 (5A) (no communication with DSM)
      • 14 (10A) (no communication with APIM, FDIM, GPSM, LTM, RETM)
      • 15 (10A) (no communication with HVAC module)
      • 16 (15A) (no communication with FCIM)
      • 20 (15A) (no communication with scan tool)
      • 26 (10A) (no communication with IC)
      • 29 (5A) (no communication with IC)
      • 32 (10A) (no communication with RCM)
      • 34 (5A) (no communication with ABS module, PSCM)
      • 35 (10A) (no communication with 4X4 control module, PAM, SASM)
      • 37 (10A) (no communication with PCM, 3.5L GTDI)
      • 39 (20A) (no communication with ACM)
      • 46 (7.5A) (no communication with OCSM)
    • Data Link Connector (DLC)
    • Wiring harness
    • Wiring, terminals or connectors
  3. Connect the scan tool to the DLC.
      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.
    • If the Integrated Diagnostic System (IDS) 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 Y , to diagnose No Power To The Scan Tool.
  4. Establish a scan tool session.
      NOTE: The scan tool first attempts to communicate with the PCM, after establishing communication with the PCM, the scan tool then attempts to communicate with all other modules on the vehicle.
    • If an IDS session cannot be established with the vehicle, (IDS may state "No communication can be established with the PCM"):
      • Choose "NO" when the scan tool prompts whether or not to retry communication.
      • Enter either a PCM part number, tear tag or calibration number to identify the vehicle and start a session (the PCM part number and 4-character tear tag are printed on the PCM label).
      • GO to PINPOINT TEST A , The PCM Does Not Respond To The Scan Tool.
  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 diagnose the failed communication network.
    • If a module fails to communicate during the network test, GO to SYMPTOM CHART .
  6. Retrieve and review the DTCs.
    • If the DTCs retrieved are related to the concern, go to DTC CHARTS . Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to the network DTC diagnostics (U-codes). For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in MULTIFUNCTION ELECTRONIC MODULES .
    • If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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