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Pinpoint Test K: The Air Conditioning (A/C) Is Always On

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK PID WACF WITH THE A/C OFF 
    • Key in ON position.
    • Place the function selector switch to the OFF position or press the OFF manual override button on the EATC module.
    • Enter the following diagnostic mode on the scan tool: PCM PID WACF.
    • Does the PCM PID WACF read YES? 

    Yes  : REPAIR circuit 73 (OG/LB). TEST the system for normal operation.

    No  : GO to K2.

  2. K2 CHECK PID ACCS WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: PCM PID ACCS.
    • Does the PCM PID ACCS read ON? 

    Yes  : GO to K3.

    No  : GO to  K5.

  3. K3 CHECK CIRCUIT 348 (RD/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: A/C Pressure Switch C1081.
    • Key in ON position.
    • Measure the voltage between A/C pressure switch C1081-4, circuit 348 (RD/VT) and ground.
      Fig 1: Measuring Voltage Between A/C Pressure Switch C1081-4, Circuit 348 (RD/VT) And Ground
      G04585079Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to K4.

    No  : GO to  K5.

  4. K4 CHECK CIRCUIT 348 (RD/VT) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: EATC Module C228b.
    • Key in ON position.
    • Measure the voltage between A/C pressure switch C1081-4, circuit 348 (RD/VT) and ground.
      Fig 2: Measuring Voltage Between A/C Pressure Switch C1081-4, Circuit 348 (RD/VT) And Ground
      G04585080Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : REPAIR circuit 348 (RD/VT) for a short to voltage. TEST the system for normal operation.

    No  : INSTALL a new function selector switch or EATC module. TEST the system for normal operation.

  5. K5 CHECK FOR VOLTAGE TO THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Key in OFF position.
    • Disconnect: A/C Compressor Clutch Field Coil C100.
    • Key in ON position.
    • Measure the voltage between A/C compressor clutch field coil C100-1, circuit 321 (GY/WH) and ground.
      Fig 3: Measuring Voltage Between A/C Compressor Clutch Field Coil C100-1, Circuit 321 (GY/WH) And Ground
      G04585081Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to K6.

    No  : ADJUST the A/C compressor clutch gap. REFER to AIR CONDITIONING (A/C) CLUTCH AIR GAP ADJUSTMENT . TEST the system for normal operation.

  6. K6 CHECK CIRCUIT 321 (GY/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: A/C Control Relay.
    • Key in ON position.
    • Measure the voltage between A/C compressor clutch field coil C100-1, circuit 321 (GY/WH) and ground.
      Fig 4: Measuring Voltage Between A/C Compressor Clutch Field Coil C100-1, Circuit 321 (GY/WH) And Ground
      G04585082Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : REPAIR circuit 321 (GY/WH) for a short to voltage. TEST the system for normal operation.

    No  : INSTALL a new A/C control relay. CHECK the A/C clutch diode. INSTALL a new diode, if necessary. TEST the system for normal operation.

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