VEHICLE STABILITY CONTROL SYSTEM CHECK FOR INTERMITTENT PROBLEMS


  1. CHECK FOR INTERMITTENT PROBLEMS

    Tech Tips

    A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the ECU Data List function of the intelligent tester.


    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. A01CB98E17

      Follow the directions on the intelligent tester to display the Data List and select areas where momentary interruption should be monitored.

      Tech Tips


      • 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.

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open FR speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      FL Speed Open FL speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      RR Speed Open RR speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      RL Speed Open RL speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      EFI Communication Open EFI communication open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      Yaw Rate Open Yaw rate sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      Deceleration Open Acceleration sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      Steering Open Steering angle sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
    6. A01CBTR

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

      Tech Tips

      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.