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) If no code is output, proceed to A.

      2. (ECU unconnected, communication line malfunctioning) If any code is output, proceed to B.


    		 B.
    A

    4.SYMPTOM SIMULATION
      NEXT

      5.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

      6.PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM

      1. Terminals of ECU (Click here)

      2. On-vehicle inspection (Click here)

      7.ADJUST, REPAIR OR REPLACE
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        8.CONFIRMATION TEST
          NEXT

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