AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use these procedures to troubleshoot the air conditioning system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  2. INSPECT BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

    If the voltage is below 11 V, recharge or replace the battery before proceeding.


    NEXT

  3. CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)*


    1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

      Result
      Result Proceed to
      MPX DTC is not output A
      MPX DTC is output B

      B

      Go to MULTIPLEX COMMUNICATION SYSTEM
      A

  4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Use the intelligent tester to check if the CAN Communication System is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

      B

      Go to CAN COMMUNICATION SYSTEM
      A

  5. PROBLEM SYMPTOMS TABLE

    Refer to the problem symptoms table Click here.

    Result
    Result Proceed to
    Fault is not listed in problem symptoms table A
    Fault is listed in problem symptoms table B

    B

    Go to step 8
    A

  6. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Terminals of ECU Click here

    2. On-vehicle Inspection

    3. Inspection


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  7. ADJUST, REPAIR OR REPLACE


    NEXT
    END