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Inspection & Verification

WARNING: This page is about a different car, the 2004 Lincoln LS. 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. See VISUAL INSPECTION CHART .
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Loose, missing or damaged A/C compressor drive belt
    • Loose or disconnected A/C clutch
    • Broken or leaking refrigerant lines
    • Obstructed in-vehicle temperature sensor
    • Disconnected in-vehicle temperature aspirator hose
    • A/C registers are not working (open/close)
    • Front floor ducts not in place
    • Incorrectly installed in-vehicle temperature sensor
    • Incorrectly installed ambient air temperature sensor
    • Fuse(s)
    • Blower motor inoperative
    • A/C compressor inoperative
    • Circuit short/open.
    • Disconnected, loose fitting, or incorrectly installed electrical connectors and pins
    • Cooling fan inoperative
    • Relays not functional or not installed
  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. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
    • Check that the program card is correctly installed.
    • Check the connections to the vehicle.
    • Check the ignition switch position.
    • Check that the battery voltage is greater than 9V.

    If the scan tool still does not allow the vehicle selection to be entered, refer to the scan tool manufacturer's manual.

  6. Carry out the Data Link Diagnostic Test using the scan tool. If the scan tool responds with:
    • SCP+, SCP- or UBP circuits fault = ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Module Communication Network Diagnostics to diagnose the network concern.
    • If the powertrain control module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and execute the self-test diagnostics for the PCM.
    • If the DATC module is not listed for a communication concern, execute the self-test diagnostics for the DATC module.
  7. If any PCM or DATC DTCs are retrieved, and are related to the concern, go to the POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX  or DUAL ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (DATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue the diagnostics.
  8. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue the diagnostics.
  9. If the DATC module cannot be accessed by the scan tool, Go TO PINPOINT TEST A .
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