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

DTC Code DTC Name
HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

Tech Tips


  • Use these procedures to troubleshoot the air conditioning system.

  • *: Use the intelligent tester.

PROCEDURE


  1. VEHICLE BROUGHT TO WORKSHOP

    Result
    Proceed to
    NEXT

    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.

    Result
    Proceed to
    NEXT

    NEXT

  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 (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  4. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*


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

      Click here

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

    B

    GO TO LIN COMMUNICATION SYSTEM Click here

    A

  5. CHECK FOR DTC*


    1. Check for DTCs.

      Click here

    2. Clear the DTC.

      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 DTC CHART Click here

    A

  6. 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 8 Click here

    A

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Terminals of ECU

      Click here

    2. Data List / Active Test

      Click here

    3. Actuator Check

      Click here

    4. On-vehicle Inspection

    5. Inspection

      Result
      Proceed to
      NEXT

    NEXT

  8. ADJUST, REPAIR OR REPLACE

    Result
    Proceed to
    NEXT

    NEXT

  9. CONFIRMATION TEST

    Result
    Proceed to
    NEXT

    NEXT

    END