AIR CONDITIONING SYSTEM > HOW TO PROCEED WITH TROUBLESHOOTING

for Preparation Click here


HINT:
  1. Use these procedures to troubleshoot the air conditioning system.
  2. *:Use the intelligent tester.



1.VEHICLE BROUGHT TO WORKSHOP

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    2.INSPECT BATTERY VOLTAGE

      Standard voltage:
      11 to 14 V

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

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    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 DTC.

    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
      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


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    8.ADJUST, REPAIR OR REPLACE

      NEXT

      END