Lexus IS250 · Service Manual STEERING

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

Perform troubleshooting according to the following flowchart.

HINT:
  1. For further details, see the page given.
  2. The intelligent tester can be used at steps 2, 3, 6, 9, and 12.


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.CHECK DTC AND FREEZE FRAME DATA

    1. Record DTCs and freeze frame data.

    NEXT

    3.CLEAR DTC AND FREEZE FRAME DATA
      NEXT

      4.PROBLEM SYMPTOM CONFIRMATION

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        5.SYMPTOM SIMULATION
          NEXT

          6.CHECK DTC

          1. Recheck for DTCs.

            HINT:
            1. Refer to the diagnostic trouble code chart if any DTCs are output.
            2. If any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first (Click here for LHD, Click here for RHD).
            3. If communication to the power steering ECU assembly is not established through the intelligent tester, inspect terminals CANH and CANL of the DLC3 and power steering ECU assembly, and inspect the IG circuit of the power steering ECU assembly.


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          7.PROBLEM SYMPTOMS TABLE
            NEXT

            8.CIRCUIT INSPECTION
              NEXT

              9.IDENTIFICATION OF PROBLEM
                NEXT

                10.REPAIR OR REPLACE
                  NEXT

                  11.CONFIRMATION TEST
                    NEXT

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