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. A004RJ2E45

      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
      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 -
      IG Voltage Value Decreased IG voltage value decrease detection / Error or Normal Normal -
      FR Speed Sensor Voltage Open Front speed sensor RH voltage open detection / Error or Normal Normal -
      FL Speed Sensor Voltage Open Front speed sensor LH voltage open detection / Error or Normal Normal -
      RR Speed Sensor Voltage Open Rear speed sensor RH voltage open detection / Error or Normal Normal -
      RL Speed Sensor Voltage Open Rear speed sensor LH voltage open detection / Error or Normal Normal -
    6. A004PY6

      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.