Lexus IS250 · Service Manual SECURITIES

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use this procedure to troubleshoot the theft deterrent system.
  2. The intelligent tester should be used in step 3.


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.CUSTOMER PROBLEM ANALYSIS

    1. Interview the customer to confirm the trouble (Click here)

    NEXT

    3.INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)

    1. Use the intelligent tester to check for normal function of the multiplex communication system.

      1. (ECU unconnected, communication line malfunctioning) Without code output, proceed to A.

      2. (ECU unconnected, communication line malfunctioning) With code output, proceed to B.


    		 B.
    A

    4.DTC CHECK

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

    2. Delete the DTC.

    3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

      1. If the DTC does not reoccur, proceed to A.

      2. If the DTC reoccurs, proceed to B.


    		 B.
    A

    5.SYMPTOM SIMULATION
      NEXT

      6.PROBLEM SYMPTOMS TABLE

      1. If the fault is not listed on the problem symptoms table, proceed to A.

      2. If the fault is listed on the problem symptoms table, proceed to B.


      		 B.
      A

      7.PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM

      1. Terminals of ECU (Click here)

      2. On-vehicle inspection (Click here)

      8.ADJUST, REPAIR OR REPLACE
        NEXT

        9.CONFIRMATION TEST
          NEXT

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