VEHICLE STABILITY CONTROL SYSTEM VSC does not Operate or VSC does not Operate Correctly

DESCRIPTION

When TRC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred.

When a communication malfunction with the ECM is detected, TRC and VSC are disabled. Also, TRC and VSC are disabled when a DTC is stored.

CAUTION / NOTICE / HINT

Note

After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform system variant learning and acceleration sensor zero point calibration.

Click here

PROCEDURE


  1. BRAKE PROBLEM CHECK


    1. Check whether the slip indicator light was illuminated when VSC did not operate.

      OK
      The slip indicator light was illuminated.

      Tech Tips

      When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.

    2. Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.

      OK
      The vehicle speed was 15 km/h (9 mph) or less.

      Tech Tips

      VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.

    3. Check whether the vehicle was driven straight for a few seconds at 15 km/h (9 mph) or more.

      OK
      The vehicle was not driven straight for a few seconds at 15 km/h (9 mph) or more.

      Tech Tips

      When the ignition switch is turned to ON, as steering angle sensor zero point calibration is not performed below 15 km/h (9 mph), VSC will not operate until the vehicle is driven straight for a few seconds at 15 km/h (9 mph) or more.

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  2. CHECK DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check the DTCs (vehicle stability control system) that are output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      Vehicle stability control system DTCs are output B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  3. CHECK TIRES


    1. Check that the tire of each wheel is the correct size.

      Click here

      OK
      The tire of each wheel is the correct size.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE

    OK

  4. CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION


    1. Turn the ignition switch off.

    2. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

      Click here

      OK
      The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.
      The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.
      Result
      Proceed to
      OK
      NG

    OK

    OBTAIN YAW RATE AND ACCELERATION SENSOR ZERO POINT Click here

    NG

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY Click here