Air Conditioning System How To Proceed With Troubleshooting

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

  1. VEHICLE BROUGHT TO WORKSHOP

  2. INSPECT BATTERY VOLTAGE

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

  4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

  5. CHECK FOR DTC*

  6. PROBLEM SYMPTOMS TABLE

  7. OVERALL ANALYSIS AND TROUBLESHOOTING*

  8. ADJUST, REPAIR OR REPLACE

Air Conditioning System -- How To Proceed With Troubleshooting


HINT:
  1. Use the following procedures to troubleshoot the air conditioning system.
  2. *: 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. Delete 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. 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