AIR CONDITIONING SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION


    1. Air conditioning system data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform troubleshooting.

  2. CHECK DLC3


    1. Check the DLC3 Click here.

  3. LIST OF OPERATION METHODS


    1. By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.

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  4. INDICATOR CHECK


    1. Turn the engine switch off.

    2. Turn the engine switch on (IG) while pressing the A/C control "AUTO" switch and "R/F" switch simultaneously. Hold both switches until the indicator check screen appears.

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    3. The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off 4 times at 1 second intervals continuously.

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      Tech Tips


      • The sensor check automatically starts when the indicator check is completed.

      • Press the "OFF" switch to cancel the check mode.

  5. SENSOR CHECK (DTC CHECK)


    1. Start the engine and warm it up.

    2. Perform the indicator check.

      Tech Tips

      After the indicator check is completed, the system enters DTC check mode automatically.

    3. Read the DTC displayed on the panel.

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      Note

      In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the actuator check, and then the sensor check again.

      Tech Tips

      Refer to Diagnostic Trouble Code Chart for details of the codes Click here.


      • When there are no problems, DTC 00 is output.

      • As an example, the illustration shows that display DTC 12 is output.

    4. If the steps are difficult to read because they change automatically, press the "DEF" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "DEF" switch is pressed.

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      Tech Tips


      • Press the "OFF" switch to finish panel diagnosis.

      • Press the "R/F" switch to enter actuator check mode.

    5. Clear the DTC


      1. During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch simultaneously.

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  6. ACTUATOR CHECK


    1. Start the engine and warm it up.

    2. Perform the indicator check.

    3. Press the "R/F" switch to perform the actuator check.

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      Tech Tips

      Be sure to perform the actuator check after starting the engine.

    4. As the actuator check is repeated from steps 1 to 10 at 1 second intervals, check the temperature and air flow visually and by hand.

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      Tech Tips


      • The display blinks at 1 second intervals in the step operation.

      • Press the "OFF" switch to finish panel diagnosis.

      • Press the "AUTO" switch to enter sensor check mode.

      Step No. Display Code Condition
      Blower Level Air Mix Damper Airflow Vent Air Inlet Damper Compressor Rear Air Mix Damper Rear Airflow Vent Rear Blower Level
      1 0 0 0% open FACE FRESH off 0% open Rr FACE 0
      2 1 1 0% open FACE FRESH off 0% open Rr FACE 1
      3 2 17 0% open FACE RECIRCULATION / FRESH on 0% open Rr FACE 17
      4 3 17 0% open FACE RECIRCULATION on 0% open Rr FACE 17
      5 4 17 50% open B/L RECIRCULATION on 50% open Rr B/L 17
      6 5 17 50% open B/L RECIRCULATION on 50% open Rr B/L 17
      7 6 17 50% open FOOT FRESH on 50% open Rr FOOT 17
      8 7 17 100% open FOOT-0 FRESH on 100% open Rr FOOT 17
      9 8 17 100% open F/D FRESH on 100% open Rr FOOT 17
      10 9 31 100% open DEF FRESH on 100% open Rr FOOT 31

    5. If the steps are difficult to read because they change automatically, press the "DEF" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "DEF" switch is pressed.

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      Tech Tips


      • Press the "OFF" switch to finish panel diagnosis.

      • Press the "R/F" switch to enter sensor check mode.