AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

DTC Code DTC Name
HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

Tech Tips


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

  • *: Use the GTS.

PROCEDURE


  1. VEHICLE BROUGHT TO WORKSHOP

    Result
    Proceed to
    NEXT

    NEXT

  2. INSPECT AUXILIARY BATTERY VOLTAGE


    1. Measure the auxiliary battery voltage with the power switch off.

      Standard Voltage
      11 to 14 V

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

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*


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

      Result
      Result Proceed to
      LIN DTCs are not output A
      LIN DTCs are output B

    B

    GO TO LIN COMMUNICATION SYSTEM Click here

    A

  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 DTCs are not output A
      CAN DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  5. CHECK FOR DTC*


    1. Check for DTCs and note any code that is output.

    2. Clear the DTCs.

    3. Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC.

      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    B

    PROBLEM SYMPTOMS TABLE Click here

    A

  6. DIAGNOSTIC TROUBLE CODE CHART


    1. Find the output DTCs in Diagnostic Trouble Code Chart Click here.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 9 Click here

  7. 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 9 Click here

    A

  8. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Panel diagnosis (indicator check, sensor check) Click here

    2. Data List / Active Test Click here

    3. Terminals of ECU Click here

    4. On-vehicle Inspection

    5. Inspection

      Result
      Proceed to
      NEXT

    NEXT

  9. ADJUST, REPAIR OR REPLACE

    Result
    Proceed to
    NEXT

    NEXT

    END