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Inspection and Verification

WARNING: This page is about a different car, the 2004 Lincoln Navigator and 2004 Ford Expedition. 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.

    Fig 1: Visual Inspection Chart
    G02779696Courtesy of FORD MOTOR CO.
  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 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:
    • SEP +, 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 DATC module is not listed for a communication concern, execute self-test diagnostics for the DATC module.
  8. If any PCM or DATC DTCs are retrieved, and are related to the concern, go to the DUAL/ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (DATC/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 DATC module cannot be accessed by the diagnostic tool, Go To PINPOINT TEST G .
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