AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedures to troubleshoot the air conditioning system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK


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  3. INSPECT BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

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


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  4. CHECK CAN COMMUNICATION SYSTEM*


    1. Use the intelligent tester to check if the CAN communication system is functioning.

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

      B

      Click here


      B

      GO TO CAN COMMUNICATION SYSTEM
      A

  5. CHECK FOR DTC*


    1. Check for DTCs.


      1. Write down the DTCs or sensor check codes.

    2. Clear the DTCs or sensor check codes.

    3. Check whether the DTCs or sensor check codes recur.


      1. Reproduce the problem symptoms in accordance with the DTCs or sensor check codes that were written down, and check whether the DTCs or sensor check codes recur.

        Tech Tips

        Refer to the DTC chart when any DTCs or sensor check codes are output.

        Result
        Result Proceed to
        DTC or sensor check code is not output A
        DTC or sensor check code is output B

      B

      Go to step 8
      A

  6. REFER TO PROBLEM SYMPTOMS TABLE

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

    B

    Go to step 8
    A

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. DATA LIST / ACTIVE TEST Click here

    2. Terminals of ECU Click here


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  8. ADJUST, REPAIR OR REPLACE


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  9. CONFIRMATION TEST


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    END