Cruise Control System - How To Proceed With Troubleshooting

Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL


CRUISE CONTROL SYSTEM - HOW TO PROCEED WITH TROUBLESHOOTING

  • HINT:
Use the following procedures to troubleshoot the cruise control system.
*: 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 .

Check for output DTCs.

  • Result:
  • ResultProceed to
    MPX DTC is not outputA
    MPX DTC is outputB
  • 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.
PROCEED TO "MULTIPLEX COMMUNICATION SYSTEM"
A
4.CHECK CAN COMMUNICATION SYSTEM*

Refer to the PRECAUTION .

Check for output DTCs.

  • Result:
  • ResultProceed to
    CAN DTC is not outputA
    CAN DTC is outputB
  • 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.
PROCEED TO "CAN COMMUNICATION SYSTEM"
A
5.DTC CHECK AND CLEAR*

Refer to the DTC CHECK / CLEAR .

NEXT
6.DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC)*
  • Result:
  • ResultProceed to
    DTC is not outputA
    DTC is outputB
A.
GO TO STEP 8
B
7.DTC CHART

Refer to the DIAGNOSTIC TROUBLE CODE CHART .

NEXT
GO TO STEP 11
8.PROBLEM SYMPTOM CONFIRMATION
  • Result:
  • ResultProceed to
    Symptom occursA
    Symptom does not occurB
A.
GO TO STEP 10
B
9.SYMPTOM SIMULATION

Refer to the ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NEXT
Go to step 8
10.PROBLEM SYMPTOMS TABLE

Refer to the PROBLEM SYMPTOMS TABLE .

NEXT
11.CIRCUIT INSPECTION
NEXT
12.TERMINALS OF ECM

Refer to TERMINALS OF ECM .

NEXT
13.IDENTIFICATION OF PROBLEM
NEXT
14.REPAIR OR REPLACE
NEXT
15.CONFIRMATION TEST
NEXT
END