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

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. 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, PCM or IPC DTCs first.
  1. N1 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  N6.
    • No  : GO to N2.
  2. N2 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 N3.
    • No  : GO to  N5.
  3. N3 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? 
    • Yes  : GO to N4.
    • No  : INSTALL a new FCIM. REFER to Refer to the appropriate Information and Entertainment Systems article for the procedure. TEST the system for normal operation.
  4. N4 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH HVAC MODULE DISCONNECTED 
    • Ignition OFF.
    • Disconnect: HVAC Module - EMTC C294.
    • Disconnect: HVAC Module - DATC C228A.
    • Disconnect: HVAC Module - DATC C228B.
    • Ignition ON.
    • 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 N5.
    • No  : GO to  N6.
  5. N5 CHECK FOR CORRECT HVAC MODULE OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all HVAC module connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all HVAC module connectors. Make sure they seat and latch correctly.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new HVAC module. REFER to CLIMATE CONTROL
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
  6. N6 CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all PCM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all PCM connectors. Make sure they seat and latch correctly.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES (gas engines) or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINES (diesel).
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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