Vehicle Stability Control System (W/ Vdim) - Check For Intermittent Problems

Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL


VEHICLE STABILITY CONTROL SYSTEM (w/ VDIM) - CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS
  • HINT:
  • A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected in the ECU data list function of the intelligent tester.
Vehicle Stability Control System (W/ Vdim) - Check For Intermittent Problems. BRAKE CONTROL. Lexus IS250 IS220d GSE20 ALE20

Turn the engine switch off and connect the intelligent tester to the DLC3.

Vehicle Stability Control System (W/ Vdim) - Check For Intermittent Problems. BRAKE CONTROL. Lexus IS250 IS220d GSE20 ALE20

Turn the engine switch on (IG). Follow the directions on the intelligent tester to display the Data List and select areas where momentary interruption should be monitored.

  • HINT:
A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check).
If the status remains on (ERROR displayed), check the continuity between the ECU and the sensors, or between ECUs.
The ERROR display on the intelligent tester remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
Item (Display)Measurement Item /
Range (Display)		Normal ConditionDiagnostic Note
FR Speed OpenFR speed sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
FL Speed OpenFL speed sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
RR Speed OpenRR speed sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
RL Speed OpenRL speed sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
EFI Communication OpenEFI communication open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
Yaw Rate OpenYaw rate sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
Deceleration OpenAcceleration sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
Steering OpenSteering angle sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
Master Cylinder OpenMaster cylinder pressure sensor open detection / ERROR or NORMALERROR: Momentary interruption
NORMAL: Normal		-
Vehicle Stability Control System (W/ Vdim) - Check For Intermittent Problems. BRAKE CONTROL. Lexus IS250 IS220d GSE20 ALE20

While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.

  • Result:
  • ERROR display does not change.
  • HINT:
  • The connector and/or wire harness will be in momentary interruption (open circuit) if the display changes. Repair or replace the connector and/or wire harness as one of them is faulty.