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Inspection and Verification

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

    Mechanical Electrical
    • Large metallic objects or electronic devices on the key ring that can be used to purchase gasoline or similar items
    • PATS key
    • Use of a non-PATS key or incorrect PATS key
    • More than one PATS key on key ring
    • Aftermarket remote start system installed
    • Body Control Module (BCM) fuse 18 (10A)
    • Wiring, terminals or connectors
    • BCM
    • PCM
  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.

    If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

  5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

    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.
    • refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no power to the scan tool.
  6. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the PCM.
  7. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
    • If the network test passes, retrieve and record the continuous memory DTCs.
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the BCM and PCM.
  9. If the DTCs retrieved are related to the concern, go to the BCM DTC Chart  or the PCM DTC Chart . For all other BCM DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES . For all other PCM DTCs, refer to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINES .
  10. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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