AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


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

  • *: Use the intelligent tester.


  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.


      NEXT

  3. CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)*


    1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

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

      B

      Go to MULTIPLEX COMMUNICATION SYSTEM
      A

  4. 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
      A

  5. CHECK FOR DTC*


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

    2. Clear the DTCs.

    3. Recheck for DTCs. Based on the DTCs output above, try to force output of the A/C 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 8
      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. Actuator Check Click here

    2. Data List / Active Test Click here

    3. Terminals of ECU Click here

    4. On-vehicle Inspection

    5. Inspection


      NEXT

  8. ADJUST, REPAIR OR REPLACE


    NEXT
    END