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

NOTE: When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.
  1. J1 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_AC) HVAC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: CC_AC HVAC PID
    • Does the CC_AC HVAC PID read DEPRESSED? 
    1. YES  : Go to  J4.
    2. NO  : Go to  J2.
  2. J2 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: AC_REQ PCM PID
    • Select OFF on the HVAC module.
    • Does the AC_REQ PCM PID read YES? 
    1. YES  : Go to  J5.
    2. NO  : Go to  J3.
  3. J3 CHECK AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: ACC_CMD PCM PID
    • Does the ACC_CMD PCM PID read ON? 
    1. YES  : Go to  J5.
    2. NO  : Go to  J4.
  4. J4 CHECK THE MODULE CONNECTION 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. J5 CHECK THE PCM CONNECTION 
    • Clear the DTCs.
    • Disconnect all of the PCM connectors.
    • Check for:
      • corrosion.
      • pushed-out connectors.
      • incorrectly seated connector.
    • Connect and correctly seat all of the PCM connectors.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. 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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