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Pinpoint Test L: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

NOTE: Some PCM and Instrument Panel Cluster (IPC) DTCs may inhibit A/C operation. If any PCM or IPC  DTCs are retrieved, diagnose those first. Refer to the PCM DTC CHART  or the INSTRUMENT PANEL CLUSTER (IPC) DTC CHART .
  1. L1 CHECK THE HVAC MODULE FOR DTCs 
    • Ignition ON.
    • Select OFF on the HVAC controls.
    • Carry out the HVAC module self-test.
    • Check for HVAC DTCs retrieved during the self-test.
    • Is DTC 52 present? 
    • Yes:  Go to L2  .
    • No:  Go to  L3.
  2. L2 CHECK THE A/C REQUEST CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC Module C228A.
    • Disconnect: Instrument Panel Cluster (IPC) C220.
    • Ignition ON.
    • Measure the resistance between ground and HVAC module C228A-4, circuit CH434 (GY/YE), harness side.
      Fig 1: Measuring Resistance Between Ground & HVAC Module
      G06938307Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  Go to  L8.
    • No:  REPAIR circuit CH434 (GY/YE) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. L3 CHECK THE AIR CONDITIONING SWITCH (A/C_SWITCH) IPC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: IPC  DataLogger.
    • Monitor the A/C_SWITCH IPC  PID
    • Select PANEL and press the A/C button (indicator off) on the HVAC controls.
    • Does the A/C_SWITCH IPC PID read INACTIVE? 
    • Yes:  Go to L4  .
    • No:  Go to  L6.
  4. L4 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Select PANEL and press the A/C button (indicator off) on the HVAC controls.
    • Monitor the AC_REQ PCM PID
    • Does the AC_REQ PCM PID read NO? 
    • Yes:  Go to L5  .
    • No:  Go to  L7.
  5. L5 CHECK AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Select PANEL and press the A/C button (indicator off) on the HVAC controls.
    • Monitor the ACC_CMD PCM PID
    • Does the ACC_CMD PCM PID read OFF? 
    • Yes:  Go to L6  .
    • No:  Go to  L7.
  6. L6 CHECK THE HVAC MODULE CONNECTION 
    • Disconnect all the HVAC module connectors.
    • Inspect the HVAC module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new HVAC module. Refer to CLIMATE CONTROL . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. L7 CHECK THE PCM CONNECTION 
    • Disconnect all the PCM connectors.
    • Inspect the PCM connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the PCM connectors.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new PCM. Refer to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  8. L8 CHECK THE IPC CONNECTION 
    • Disconnect all the IPC  connectors.
    • Inspect the IPC  connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the IPC  connectors.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new IPC  . Refer to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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