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Vehicle Stability Control System: Calibration

  1. DESCRIPTION 
    1. After replacing the VSC relevant components or performing "Front wheel alignment adjustment", clearing and reading the sensor calibration data is necessary.
    2. Follow the chart to perform calibration.
      CALIBRATION CHART

      Replacing Parts Necessary Operation
      Skid Control ECU Yaw rate sensor and deceleration sensor zero point calibration
      Yaw Rate Sensor
      1. Clearing zero point calibration data
      2. Yaw rate sensor and deceleration sensor zero point calibration
      Front Wheel Alignment
      1. Clearing zero point calibration data
      2. Yaw rate sensor and deceleration sensor zero point calibration
  2. CLEAR ZERO POINT CALIBRATION DATA (When not Using Techstream) 

    HINT:

    After replacing the yaw rate sensor and deceleration sensor, make sure to clear zero point calibration data in the skid control ECU and perform zero point calibration.

    1. Clear the zero point calibration data using the SST check wire.
      1. Turn the ignition switch ON.
      2. Using SST, connect and disconnect terminals 12 (TS) and 4 (CG) of the DLC3 4 times or more within 8 seconds.

        SST 09846-18040 

      3. Check that the warning light indicates the normal code.
      4. Remove SST.
        Fig 1: Identifying DLC3 Connector Terminals
        G05290580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR (When not Using Techstream) 

    HINT:

    After replacing the brake master cylinder, make sure to perform yaw rate sensor and deceleration sensor zero point calibration.

    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it. Keep it in a stationary condition. Do not start the engine.
    • Be sure to perform the calibration on a level surface (with an inclination of less than 1°).
    1. Move the shift lever to P.
    2. Clear the zero point calibration data.
    3. Procedures for test mode:
      1. Turn the ignition switch OFF.
      2. Apply the parking brake (parking brake switch ON).
      3. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

        SST 09843-18040 

        Fig 2: Identifying DLC3 Connector Terminals
        G05290581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the steering wheel is in the straight-ahead position and move the shift lever to P.
      5. Turn the ignition switch ON.
    4. Keep the vehicle in the stationary condition on a level surface for 2 seconds or more.
    5. Check that the VSC OFF indicator light blinks.

      HINT:

      • If the VSC OFF indicator light does not blink, perform the zero point calibration again.
      • The zero point calibration is performed only once after the system enters the test mode.
      • Calibration cannot be performed again until the stored data is cleared once.
  4. CLEAR ZERO POINT CALIBRATION DATA (When Using Intelligent Techstream) 
    1. Clear the zero point calibration data.
      1. Connect the Techstream to the DLC3.
      2. Turn the ignition switch ON.
      3. Operate the Techstream to clear the zero point calibration data.

        HINT:

        Refer to the Techstream operator's manual for further details.

  5. PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR 

    (When Using Techstream) 

    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it. Keep it in a stationary condition. Do not start the engine.
    • Be sure to perform the calibration on a level surface (with an inclination of less than 1°).
    1. Check that the steering wheel is in the straight ahead position and move the shift lever to P.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch ON.
    4. Change the Techstream to test mode.
    5. Obtain the zero point of the yaw rate sensor and deceleration sensor:
      1. Keep the vehicle in a stationary condition on a level surface for 2 seconds or more.
      2. Check that the VSC OFF indicator light blinks.

        HINT:

        • If the VSC OFF indicator light does not blink, perform the zero point calibration again.
        • The zero point calibration is performed only once after the system enters the test mode.
        • Calibration cannot be performed again until the stored data is cleared once.
    6. Turn the ignition switch OFF.
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