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Inspection and Verification

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern by operating the climate control system to duplicate the condition.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    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) A 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 performed, be sure to inspect for any disconnected, loose fitting, or incorrectly installed component, module and in-line electrical connectors and pins.
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  5. If the cause is not visually evident, connect a diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  6. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  7. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:
    • SCP+, SCP-, or UBP CIRCUITS FAULT = ALL ECUS NO RESP/NOT EQUIP, refer to MODULE COMMUNICATIONS NETWORK 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 EATC module is not listed for a communication concern, execute self-test diagnostics for the EATC module.
  8. If any PCM or EATC DTCs are retrieved, and are related to the concern, go to the DIAGNOSTIC TROUBLE CODE (DTC) INDEX  or the ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnostics.
  9. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue diagnostics.
  10. If the EATC module cannot be accessed by the diagnostic tool, GO to PINPOINT TEST E .
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