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Inspection and Verification

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. 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
    • Loose, misrouted or damaged vacuum lines(1)
    • Broken or leaking vacuum control motor(1)
    • Discharged A/C system
    • Broken or leaking refrigerant lines
    • Open fuses
    • Blower motor inoperative
    • A/C compressor inoperative
    • Circuitry open/shorted
    • Disconnected, loose fitting, or incorrectly installed electrical connectors and pins
    (1) leak in the vacuum control circuit may occur during acceleration (slow leak), may exist at all times (large leak), and may exist only when specific functions are selected (indicating a leak in that portion of the circuit). The vacuum hoses used in the passenger compartment control circuit are constructed from PVC plastic material. The vacuum hoses used in the engine compartment are constructed of Hytrel®. Because of the materials used, never pinch the vacuum hoses off during diagnosis to locate a leak. A wood golf tee can be used as a plug when it is necessary to plug one end of the vacuum hose for leak test purposes
    .
  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 concern(s) that can be readily identified, repair as required.
  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.

    If the scan tool still does not allow with the vehicle selection to be entered, refer to the scan tool 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 COMMUNICATIONS NETWORK to diagnose the communications network concern.
    • If the powertrain control module (PCM) (12A650) is not listed for a communication concern, turn the A/C controls to OFF and carry out the self-test diagnostics for the PCM.
    • If the remote climate control (RCC) module (18C612) is not listed for a communication concern on vehicles equipped with EATC, carry out the Remote Climate Control Module Self-Test.
  7. If any PCM or RCC module diagnostic trouble codes (DTCs) are retrieved and related to the concern, go to the POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  or the REMOTE CLIMATE CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnostics.
  8. If no DTCs related to the concern are retrieved, go to the SYMPTOM CHART  to continue the diagnostics.
  9. If the RCC module cannot be accessed by the scan tool, GO to PINPOINT TEST I .
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