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.

      Refer to the table below and then perform the necessary operation according to the part to be replaced in order to perform calibration.

      Part to be Replaced / Operation Necessary Operation

      • Skid control ECU assembly

      • Yaw rate sensor

      1. Clear zero point calibration data.

      2. Perform yaw rate sensor zero point calibration.
      Wheel alignment adjustment

      1. Clear zero point calibration data.

      2. Perform yaw rate sensor zero point calibration.

  2. OBTAIN ZERO POINT OF YAW RATE 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 0.25 degrees).

    • While obtaining the zero point, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not lifted up or loaded).

    Tech Tips

    When entering Test Mode, the skid control ECU assembly communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode.


    1. Clear the zero point calibration data.


      1. Turn the engine switch on (IG).

      2. Check that the shift position is in P.

      3. Check that the steering wheel is centered.

      4. Turn the engine switch off.

      5. Connect the GTS to the DLC3.

      6. Turn the engine switch on (IG).

      7. Check that the parking brake is applied.

      8. Turn the GTS on.

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


        Chassis > ABS/VSC/TRC > Utility
        Tester Display
        Reset Memory

      10. Turn the engine switch off.

        Note

        If the engine switch is turned on (IG) for more than 15 seconds with the shift position in P after the zero point of the yaw rate 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 assembly will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU assembly will then also indicate this as a malfunction of the VSC system using the indicator light.

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


      1. Turn the engine switch off.

      2. Check that the shift position is in P.

        Note

        DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) and C1336 (Zero Point Calibration of Acceleration Sensor Undone) will be stored if the shift position is not in P.

      3. Check that the steering wheel is centered.

      4. Connect the GTS to the DLC3.

      5. Turn the engine switch on (IG).

      6. Check that the parking brake is released.

      7. Turn the GTS on.

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


        Chassis > ABS/VSC/TRC > Utility
        Tester Display
        Test Mode

      9. After Test Mode has been entered, keep the vehicle stationary on a level surface for 4 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.

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

        Tech Tips


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

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

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

      11. Turn the engine switch off and disconnect the GTS.