AIR CONDITIONING SYSTEM (for Automatic 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


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  2. 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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  3. 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 Click here

      A

  4. CHECK FOR DTC*


    1. Check for DTCs and note any codes that are output Click here.

    2. Clear the DTC Click here.

    3. Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.

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

      B

      GO TO STEP 7
      A

  5. PROBLEM SYMPTOMS TABLE


    1. 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 7
      A

  6. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Panel diagnosis (indicator check) Click here

    2. Panel diagnosis (sensor check) Click here

    3. Data List/Active Test Click here

    4. Terminals of ECU Click here

    5. On-vehicle Inspection

    6. Inspection


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  7. ADJUST, REPAIR OR REPLACE


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    END