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Inspection and Verification

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer's concern by operating the climate control system to duplicate the condition.
  2. Inspect to determine if one of the following mechanical or electrical concerns apply:
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Loose, missing or damaged A/C compressor drive belt
    • Loose or disconnected A/C clutch
    • Broken or binding door/actuator
    • Broken or leaking refrigerant lines
    • Obstructed in-vehicle temperature sensor
    • Disconnected in-vehicle temperature aspirator hose
    • Smart Junction Box (SJB) fuse(s):
      • 15 (10A)
      • 37 (10A)
      • 45 (5A)
      • 66 (40A)
    • Battery Junction Box (BJB) fuse 35 (10A)
    • Blower motor inoperative
    • A/C compressor inoperative
    • Circuitry open/shorted
    • Disconnected electrical connectors
    • Cooling fan inoperative
  3. As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting or incorrectly installed component, module and in-line electrical connectors and pins.
  4. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
    5. NOTE: Make sure to use the latest scan tool software release.
  5. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    6. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC  are provided to the VCM  .
  6. 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 VCM  .
  7. 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, HVAC module - Dual Automatic Temperature Control (DATC).
  8. Carry out the network test.
    • If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
    • If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  9. Clear the continuous DTCs and carry out the self-test diagnostics for the HVAC module - DATC  .
    10. NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to INTRODUCTION - GASOLINE MODELS .
  10. If the HVAC module - DATC  DTCs retrieved are related to the concern, go to the HVAC MODULE - DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) DTC CHART . If the PCM DTCs retrieved are related to the concern, go to the PCM DTC CHART . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
  11. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART - CLIMATE CONTROL SYSTEMS  or GO to SYMPTOM CHART - NVH .
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