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

Tech Tips


  • Use these procedures to troubleshoot the air conditioning system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK


    NEXT

  3. 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

  4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Use an 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 Click here

      A

  5. CHECK FOR DTC*


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

      Tech Tips

      Refer to the DTC Check/Clear Click here.

    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 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
      A

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List/Active Test Click here

    2. Terminals of ECU Click here

    3. On-vehicle Inspection

    4. Inspection


      NEXT

  8. ADJUST, REPAIR OR REPLACE


    NEXT
    END