Lexus IS250 · Service Manual CRUISE CONTROL SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use the following procedures to troubleshoot the cruise control system.
  2. *: Use the intelligent tester.


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.PROBLEM SYMPTOM CONFIRMATION
      NEXT

      3.CHECK MULTIPLEX COMMUNICATION SYSTEM*
        Refer to HOW TO PROCEED WITH TROUBLESHOOTING (Click here).

      1. Check for output DTCs.

        Result:
        Result
        		 Proceed to
        MPX DTC is not output
        		 A
        MPX DTC is output
        		 B

        HINT:
        The ECM of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.


      		 B.
      A

      4.CHECK CAN COMMUNICATION SYSTEM*
        Refer to the PRECAUTION (Click here).

      1. Check for output DTCs.

        Result:
        Result
        		 Proceed to
        CAN DTC is not output
        		 A
        CAN DTC is output
        		 B

        HINT:
        The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.


      		 B.
      A

      5.DTC CHECK AND CLEAR*
        Refer to the DTC CHECK / CLEAR (Click here).
      NEXT

      6.DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC)*

        Result:
        Result
        		 Proceed to
        DTC is not output
        		 A
        DTC is output
        		 B


      		A.
      B

      7.DTC CHART
        Refer to the DIAGNOSTIC TROUBLE CODE CHART (Click here).
      NEXT

      8.PROBLEM SYMPTOM CONFIRMATION

        Result:
        Result
        		 Proceed to
        Symptom occurs
        		 A
        Symptom does not occur
        		 B


      		A.
      B

      9.SYMPTOM SIMULATION
        Refer to the ELECTRONIC CIRCUIT INSPECTION PROCEDURE (Click here).
      NEXT

      10.PROBLEM SYMPTOMS TABLE
        Refer to the PROBLEM SYMPTOMS TABLE (Click here).
      NEXT

      11.CIRCUIT INSPECTION
        NEXT

        12.TERMINALS OF ECM
          Refer to TERMINALS OF ECM (Click here).
        NEXT

        13.IDENTIFICATION OF PROBLEM
          NEXT

          14.REPAIR OR REPLACE
            NEXT

            15.CONFIRMATION TEST
              NEXT

              ← SYSTEM DESCRIPTIONROAD TEST →