Lexus IS250 · Service Manual SECURITIES

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use these procedures to troubleshoot the engine immobiliser system.
  1. The intelligent tester should be used in steps 3, 4 and 6.


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.CRANK ENGINE FOR MORE THAN 10 SECONDS
      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 (BEAN).

        1. (ECU connected, communication line malfunctioning) Without code outputs, proceed to A.

        2. (ECU connected, communication line malfunctioning) With code outputs, proceed to B.


      		 B.
      A

      4.CHECK FOR DTC

      1. Check for DTCs and note any codes that are output (Click here).

      2. Delete the DTC.

      3. Recheck for DTCs. Based on the DTCs output above, try to duplicate the SFI system DTC or engine immobiliser system DTC by simulating the symptoms indicated by the DTC.

        Result:
        Result
        		 Proceed to
        DTC output does not reoccur
        		 A
        SFI system DTC output reoccurs
        		 B
        Engine immobiliser system DTC output reoccurs
        		 C


      		B.

      		C.
      A

      5.PROBLEM SYMPTOMS TABLE

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

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


      		 B.
      A

      6.OVERALL ANALYSIS AND TROUBLESHOOTING

      1. DATA LIST/ACTIVE TEST (Click here).

      2. Terminals of ECU (Click here).

      NEXT

      7.ADJUST, REPAIR OR REPLACE
        NEXT

        8.CONFIRMATION TEST
          NEXT

          ← SYSTEM DESCRIPTIONPROBLEM SYMPTOMS TABLE →