ELECTRONICALLY CONTROLLED BRAKE SYSTEM INITIALIZATION


  1. DESCRIPTION


    1. Perform initialization and calibration of the linear solenoid valve when the brake booster with master cylinder (skid control ECU, brake actuator or pressure sensor), brake pedal stroke sensor or brake pedal is replaced.

      Follow the procedure to perform initialization.

      Tech Tips


      • If there is a problem with the auxiliary battery (12 V) voltage, initialization and calibration of the linear solenoid valve cannot be completed normally. Make sure to check the auxiliary battery voltage before performing initialization and calibration of the linear solenoid valve.

      • If the actuator's temperature is high, initialization and calibration of the linear solenoid valve may not be completed normally. If so, wait until the temperature decreases and then perform initialization and calibration of the linear solenoid valve.

      • If the power switch is turned off (lock), brake pedal is depressed, parking brake is applied or vehicle speed signal is input while the linear solenoid valve offset learning is being performed, the learning will be canceled.

      Part to be Replaced Necessary Operation

      Brake booster with master cylinder

      (Skid control ECU, brake actuator or pressure sensor)

      		 Initialization and calibration of the linear solenoid valve

      • Brake pedal stroke sensor

      • Brake pedal

      1. Clearing stored linear solenoid valve calibration data

      2. Initialization and calibration of the linear solenoid valve

  2. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE

    Note

    If the brake pedal stroke sensor or brake pedal has been replaced, it is necessary to perform linear solenoid valve learning.

    If the brake booster with master cylinder has been replaced, or the brake booster pump or brake master cylinder reservoir has been replaced, linear solenoid valve learning will be automatically performed during the Bleed Brake System procedure Click here.

    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 stored linear solenoid valve 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 linear solenoid valve calibration data using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Reset Memory.

    2. Perform initialization and calibration of the linear solenoid valve.


      1. Turn the power switch off (lock).

      2. Check that the steering wheel is centered.

      3. Check that park (P) is selected.

      4. Check that the parking brake is released.

        Note

        Linear valve offset learning cannot be started with the parking brake applied. If the parking brake is applied during offset learning, the learning process will be canceled and then restarted when the parking brake is released.

      5. Connect the GTS to the DLC3.

      6. Turn the power switch on (IG) with the brake pedal released.

        Note


        • If the linear solenoid valve offset learning is performed without turning the power switch on (IG), the learning process may not be completed properly because of insufficient auxiliary battery voltage.

        • When the linear solenoid valve offset learning is interrupted, or the learning process is performed with park (P) not selected, DTC C1345 (Linear Solenoid Valve Offset Learning undone) will be stored.

      7. Turn the GTS on.

      8. Switch the skid control ECU to the Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / ECB* Utility / Linear Valve Offset.

        *: Electronically Controlled Brake System

      9. Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.

      10. Check that the interval between blinks of the brake warning light / yellow (minor malfunction) changes from 1 second to 0.25 seconds.

        Tech Tips


        • The time needed to complete initialization and calibration of the linear solenoid valve varies depending on auxiliary battery voltage.

        • The brake warning light / yellow (minor malfunction) blinks at 1 second intervals during initialization and calibration of the linear solenoid valve and changes to the Test Mode display.

        • The brake warning light / yellow (minor malfunction) blinks at 0.25 seconds intervals if the Test Mode is normal.

        • 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).

      11. Check that DTC C1345 (Linear Solenoid Valve Offset Learning undone) which indicates trouble with stroke sensor zero point learning is not output when the brake warning light / yellow (minor malfunction) changes to the Test Mode display upon initialization and calibration of the linear solenoid valve completion.

      12. Perform the zero point calibration of the yaw rate and acceleration sensor Click here.

      13. Enter the normal mode from the Test Mode following the GTS directions.

        Tech Tips

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

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