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

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before carrying out the following test, diagnose any HVAC or PCM DTCs.
  1. Q1 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 press the A/C button (indicator off) on the HVAC controls and monitor the AC_REQ PCM PID.
    • Does the AC_REQ PCM PID read NO? 
      • Yes  : GO to  Q6.
      • No  : For vehicles with navigation, GO to  Q3.

        For vehicles without navigation, GO to Q2.

  2. Q2 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_SW_AC) HVAC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: HVAC DataLogger.
    • Select PANEL on the HVAC controls and monitor the CC_SW_AC HVAC PID.
    • Does the CC_SW_AC HVAC PID read Inactive? 
      • Yes  : GO to  Q4.
      • No  : GO to  Q5.
  3. Q3 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_SW_AC) FCIM PID WITH THE A/C OFF 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Front Controls Interface Module (FCIM) DataLogger.
    • Monitor the CC_SW_AC FCIM PID
    • Select PANEL on the HVAC controls and monitor the CC_SW_AC FCIM PID.
    • Does the CC_SW_AC FCIM PID read Inactive? 
  4. Q4 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH HVAC MODULE DISCONNECTED 
    • Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C294A.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C228A/C2109A.
    • Disconnect: HVAC Module - DATC C228B/C2109B.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Monitor the AC_REQ PCM PID
    • Does the AC_REQ PCM PID read NO? 
      • Yes  : GO to Q5.
      • No  : GO to  Q6.
  5. Q5 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module connectors for:
      • corrosion
      • pushed-out terminals
      • damaged terminals
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Enter the following diagnostic mode on the scan tool: Self-Test -
    • HVAC Module.
    • 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.
  6. Q6 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.
    • Clear the DTCs.
    • Enter the following diagnostic mode on the scan tool: Self-Test - PCM.
    • 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.
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