AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use these procedures to troubleshoot the air conditioning system.

  • *: Use the GTS.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK


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  3. INSPECT BATTERY VOLTAGE


    1. Measure the voltage of the battery.

      Standard voltage
      11 to 14 V

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


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  4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Use the GTS 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

  5. CHECK FOR DTC*


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

    2. Clear the DTCs Click here.

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

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

      B

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  6. PROBLEM SYMPTOMS TABLE


    1. Refer to 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

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Terminals of ECU Click here

    2. Data List / Active Test Click here

    3. On-vehicle Inspection

    4. Inspection


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  8. ADJUST, REPAIR OR REPLACE


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  9. CONFIRMATION TEST


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    END