ELECTRONICALLY CONTROLLED BRAKE SYSTEM CALIBRATION


  1. DESCRIPTION


    1. After replacing any VSC related components or performing wheel alignment adjustment, clear and read the sensor calibration data.

      Follow the chart below to perform calibration.

      Part to be Replaced / Operation Necessary Operation
      Brake booster with master cylinder (Skid control ECU) Yaw rate and acceleration sensor zero point calibration
      Yaw rate and acceleration sensor (Airbag ECU assembly)

      1. Clearing zero point calibration data

      2. Yaw rate and acceleration sensor zero point calibration
      Wheel alignment adjustment

      1. Clearing zero point calibration data

      2. Yaw rate and acceleration sensor zero point calibration

  2. OBTAIN ZERO POINT OF YAW RATE AND ACCELERATION SENSOR

    Note


    • While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it.

    • Be sure to perform this procedure on a level surface (with an inclination of less than 1 degree).

    Tech Tips

    When entering Test Mode, the skid control ECU (brake booster with master cylinder assembly) communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-crash safety system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode (w/ Pre-crash Safety System).


    1. Clear the zero point calibration data.


      1. Turn the power switch off (lock).

      2. Check that the steering wheel is centered.

      3. Check that park (P) is selected.

      4. Connect the GTS to the DLC3.

      5. Turn the power switch on (IG).

      6. Turn the GTS on.

      7. Select the skid control ECU to clear the zero point calibration data using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Reset Memory.

      8. Turn the power switch off (lock).

        Note

        If the power switch is turned on (IG) for more than 15 seconds with park (P) selected after the zero point of the yaw rate and acceleration sensor has been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU will then also indicate this as a malfunction of the VSC system using the indicator light.

    2. Perform the zero point calibration of the yaw rate and acceleration sensor.


      1. Turn the power switch off (lock).

      2. Check that the steering wheel is centered.

      3. Check that park (P) is selected.

        Note

        DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor undone) and C1336 (Zero Point Calibration of Deceleration Sensor undone) will be stored if park (P) is not selected.

      4. Connect the GTS to the DLC3.

      5. Turn the power switch on (IG).

      6. Turn the GTS on.

      7. Switch the skid control ECU to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Test Mode.

      8. After Test Mode has been entered, keep the vehicle stationary on a level surface for 2 seconds or more.

        Tech Tips

        Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs (w/ Pre-crash Safety System).

      9. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in Test Mode.

        Tech Tips


        • If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, perform zero point calibration again.

        • The zero point calibration is performed only once after the system enters Test Mode.

        • Calibration cannot be performed again until the stored data is cleared.

      10. Turn the power switch off (lock) and disconnect the GTS.