Lexus IS250 · Service Manual COMMUNICATION SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

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


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.CHECK FOR DTC

    1. Check for DTCs 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.

      Result:
      Result
      		 Proceed to
      DTC does not reoccur
      		 A
      DTC reoccurs
      		 B


    		B.
    A

    3.OVERALL ANALYSIS AND TROUBLESHOOTING

    1. Terminals of ECU (Click here).

    NEXT

    4.ADJUST, REPAIR OR REPLACE
      NEXT

      5.CONFIRMATION TEST
        NEXT

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