ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster) CALIBRATION


  1. DESCRIPTION


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

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

      Parts to be Replaced / Operation Necessary Operation
      Skid control ECU (brake actuator assembly) Perform acceleration sensor (yaw rate sensor) zero point calibration and store system information.
      Acceleration sensor (yaw rate sensor)

      • Clear zero point calibration data and system information.

      • Perform acceleration sensor (yaw rate sensor) and zero point calibration and store system information.
      Wheel alignment adjustment

      • Clear zero point calibration data and system information.

      • Perform acceleration sensor (yaw rate sensor) zero point calibration and store system information.

  2. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION

    Note


    • Stored system information cannot be overwritten unless it is cleared. Clear the stored information and then store new system information.

    • 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

    w/ Pre-collision System:

    When entering test mode, the skid control ECU 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 and system information.

      Note

      Performing the following procedure will clear the zero point of the acceleration sensor (yaw rate sensor) and system information simultaneously.


      1. Turn the engine switch on (IG).

      2. Check that the steering wheel is centered.

      3. Check that the shift state is in park (P).

      4. Turn the engine switch off.

      5. Connect the GTS to the DLC3.

      6. Turn the engine switch on (IG).

      7. Turn the GTS on.

      8. Select the skid control ECU (brake actuator 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

      9. Turn the engine switch off.

        Note


        • If the vehicle is driven after the zero point of the acceleration sensor (yaw rate sensor) and system information are cleared, DTCs will be stored.

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

    2. Perform the acceleration sensor (yaw rate sensor) zero point calibration and store system information.

      Note

      Performing the following procedure will perform the acceleration sensor (yaw rate sensor) zero point calibration and store system information simultaneously.


      1. Turn the engine switch on (IG).

      2. Check that the steering wheel is centered.

      3. Check that the shift state is in park (P).

        Note


        • When Test Mode is selected with the shift state not in park (P), the acceleration sensor (yaw rate sensor) zero point calibration incomplete DTC is stored.

        • When the vehicle is driven with the zero point cleared, the acceleration sensor (yaw rate sensor) zero point calibration incomplete DTC is stored.

        • If a DTC is stored that indicates zero point calibration is incomplete, repeat the procedure starting at the step for clearing the zero point calibration data and system information.

      4. Connect the GTS to the DLC3.

      5. Turn the engine switch on (IG).

      6. Turn the GTS on.

      7. Switch the skid control ECU (brake actuator 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

      8. After Test Mode has been entered, keep the vehicle stationary on a level surface for 5 seconds or more.

      9. Check that the slip indicator light comes on for several seconds and then blinks in the Test Mode pattern.

        Tech Tips


        • If the slip indicator light does 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.

        • w/ Pre-collision System:

          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. Turn the engine switch off and disconnect the GTS.