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

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Diagnose any PCM, HVAC module or ACCM DTCs before carrying out the following pinpoint test.
  1. J1 CHECK THE A/C EVAPORATOR TEMPERATURE (EVAP_TEMP) HVAC PID 
    • Allow the vehicle exterior and interior to stabilize to an ambient temperature.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: EVAP_TEMP HVAC PID.
    • Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? 
    1. Yes  : For vehicles not equipped  with navigation, GO to J2. For vehicles equipped  with navigation, GO to  J3.
    2. No  : INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
  2. J2 CHECK THE (A/C) SWITCH (CC_SW_AC) HVAC PID WITH THE A/C OFF 
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: CC_SW_AC HVAC PID.
    • Select PANEL and make sure the A/C indicator is OFF.
    • Does the CC_SW_AC HVAC PID read Inactive? 
    1. Yes  : GO to  J4.
    2. No  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
  3. J3 CHECK THE (A/C) SWITCH (CC_SW_AC) FCIM PID WITH THE A/C OFF 
    NOTE: Before carrying out this test step, be sure all other FCIM button functions are functioning correctly. If all other buttons operate correctly, continue with this test step. If multiple buttons are incorrectly functioning and DTC U0256:00 is not present, install a new FCIM. Test the system for normal operation. If DTC U0256:00 is present, diagnose the DTC first.
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: CC_SW_AC FCIM PID.
    • Select PANEL and make sure the A/C indicator is OFF.
    • Does the CC_SW_AC FCIM PID read Inactive? 
    1. Yes  : GO to J4.
    2. No  : INSTALL a new FCIM. REFER to INFORMATION & ENTERTAINMENT SYSTEMS -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
  4. J4 CHECK THE AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: ACC_CMD PCM PID.
    • Select PANEL and make sure the A/C indicator is OFF.
    • Does the ACC_CMD PCM PID read OFF? 
    1. Yes  : INSTALL a new electric A/C compressor. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
    2. No  : INSTALL a new PCM. TEST the system for normal operation.
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