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 harnesses between the sensors and ECUs can be detected using the ECU Data List function of the intelligent tester.


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. A01IT6QE40

      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 during the 3 seconds after the ignition switch is turned to ON (initial check).

      • If ERROR remains displayed, measure the resistance 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 a momentary interruption (open circuit) to the normal condition.

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open

      Front speed sensor RH open detection/

      Error or Normal

      		 Normal -
      FL Speed Open

      Front speed sensor LH open detection/

      Error or Normal

      		 Normal -
      RR Speed Open

      Rear speed sensor RH open detection/

      Error or Normal

      		 Normal -
      RL Speed Open

      Rear speed sensor LH open detection/

      Error or Normal

      		 Normal -
      EFI Communication Open

      EFI communication open detection/

      Error or Normal

      		 Normal -
      Yaw Rate Open

      Yaw rate sensor open detection/

      Error or Normal

      		 Normal -
      Deceleration Open

      Acceleration sensor open detection/

      Error or Normal

      		 Normal -
      Steering Open

      Steering angle sensor open detection/

      Error or Normal

      		 Normal -
    6. A01ITSK

      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.