AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


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

  • *: Use the GTS.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  2. INSPECT BATTERY VOLTAGE


    1. Inspect the battery voltage.

      Standard voltage
      11 to 14 V

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

    2. Using the GTS, inspect battery voltage reduction history "Battery Control Count (Body ECU)" in the Data List Click here.

    3. Using the GTS, check the Data List item "Operation Limitation Control History Count" Click here.

      Tech Tips

      When "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)" both display a value other than "0", the operation of the following functions has been limited in the past. If the current operation is being limited, perform troubleshooting for the charging system, as "Operation of Electrical items Restricted" will be displayed on the multi-information display in the combination meter assembly.


      • PTC Heater (w/ PTC Heater)

      • Climate Control Seat System (w/ Climate Control Seat System)

      • Seat Heater System (w/ Seat Heater System)


      1. After performing an inspection, using the GTS, clear the values for "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)".


      NEXT

  3. 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 (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 FOR DTC*


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

    2. Clear the DTCs Click here.

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

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

      B

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  5. 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

      ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE
      A

  6. 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


      NEXT

  7. ADJUST, REPAIR OR REPLACE


    NEXT
    END