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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 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. N1 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 press the A/C button (indicator off) on the HVAC controls.

    Does the CC_SW_AC HVAC PID read Inactive? 

    1. Yes  : GO to N2  .
    2. No  : INSTALL a new Front Controls Interface Module (FCIM). REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
  2. N2 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.
    • Monitor the AC_REQ PCM PID

    Does the AC_REQ PCM PID read OFF? 

    1. Yes  : GO to  N5.
    2. No  : GO to N3  .
  3. N3 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH HVAC MODULE DISCONNECTED 
    • Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C2357.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C228A.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Monitor the AC_REQ PCM PID

    Does the AC_REQ PCM PID read OFF? 

    1. Yes  : GO to N4  .
    2. No  : GO to  N5.
  4. N4 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module component and harness side connectors for:
      • corrosion
      • damaged pins
      • pushed-out 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? 

    1. Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
  5. N5 CHECK THE PCM CONNECTION 
    • Disconnect all the PCM connectors.
    • Inspect the PCM component and harness side connectors for:
      • corrosion
      • damaged pins
      • pushed-out 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? 

    1. Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    2. 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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