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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (Electronically Controlled Brake System (HV) - Diagnostics - Introduction (1 Of 2)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> Utility [11/2023 - ] >> Utility [11/2023 - ]

Utility [11/2023 - ]

WARNING: This page is about a different variant/trim than selected.
  1. DESCRIPTION 
    1. If any of the parts listed in the following table are replaced or adjusted, it is necessary to perform the specified operation.
      NOTE:

      Learning cannot be performed again until the values stored during the previous learning (linear solenoid valve offset, SM solenoid valve offset, brake pedal stroke sensor assembly zero point, system information, and yaw rate and acceleration sensor zero point) have been cleared. After replacing parts, clear the previous values before performing learning.

      NECESSARY OPERATIONS AFTER REPLACEMENT OR ADJUSTMENT

      Parts to be Replaced / Operation Necessary Operation
      • No. 1 skid control ECU (brake booster with master cylinder assembly)
      • No. 2 skid control ECU (brake actuator assembly)
      1. Bleed air.
      2. Perform "Calibration".
      • Brake pedal stroke sensor assembly*
      • Brake pedal*
      • Yaw rate and acceleration sensor (airbag sensor assembly)*
      		 Perform "Calibration".
      • Brake pedal stroke sensor assembly adjustment
      • Wheel alignment adjustment
      		 Perform "Calibration".

      *: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

  2. UTILITY ITEMS 
    Utility Items Main Purpose Link
    All Readiness Confirm if DTC judgment has been completed. Refer to utility
    Calibration Enter Dealer Mode (Calibration) and perform linear solenoid valve offset learning, SM solenoid valve offset learning, brake pedal stroke sensor assembly zero point calibration, system information memorization, and yaw rate and acceleration sensor zero point calibration. Refer to utility
    Signal Check Enter Dealer Mode (Signal Check) and perform a signal inspection of the electronically controlled brake system. Refer to TEST MODE PROCEDURE [11/2023 - ] 
    Vehicle Control History (RoB) View vehicle control history. Refer to VEHICLE CONTROL HISTORY [11/2023 - ]
    ECB* Utility
    - Motor Deactivate    		 Prohibit operation of the pump motor in the brake booster with accumulator pump assembly. -
    Reset Memory Clear the following values:
    • Linear solenoid valve offset
    • SM solenoid valve offset
    • Brake pedal stroke sensor assembly zero point
    • System information
    • Yaw rate and acceleration sensor zero point
    		 Refer to utility

    *: Electronically Controlled Brake System

  3. CALIBRATION 
    NOTE:
    • When replacing the brake pedal stroke sensor assembly, brake pedal, No. 1 skid control ECU (brake booster with master cylinder assembly), No. 2 skid control ECU (brake actuator assembly) or yaw rate and acceleration sensor (airbag sensor assembly), perform "Calibration".
    • When "Bleeding" is performed after replacing the No. 1 skid control ECU (brake booster with master cylinder assembly) or No. 2 skid control ECU (brake actuator assembly), "Calibration" will be performed automatically.
    • When reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform "Calibration".
    • Make sure to perform the yaw rate and acceleration sensor zero point calibration on a flat surface (gradient of 0.2° or less) and ensure that the doors are not opened or closed and the vehicle is not moved or shaken. Also, to avoid vibration due to engine idle, do not turn the ignition switch to ON (READY).
    • When performing the yaw rate and acceleration sensor zero point calibration, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not completely or partially lifted up)
    1. To ensure that calibration completes correctly, confirm the following items before performing "Calibration":
      1. The auxiliary battery voltage is 11 to 15.5 V when the ignition switch is turned to ON (READY).
      2. The brake booster with master cylinder assembly and brake actuator assembly are not hot.

        HINT: 

        If the temperature of the brake booster with master cylinder assembly or brake actuator assembly is excessively high, wait until it cools down before performing "Calibration".

    2. Clear the linear solenoid valve offset, SM solenoid valve offset, brake pedal stroke sensor assembly zero point, system information, and yaw rate and acceleration sensor zero point.
      1. Turn the ignition switch off.
      2. Check that the steering wheel is centered.
      3. Check that the shift lever is in P.
      4. Connect the GTS to the DLC3.
      5. Turn the ignition switch to ON.
      6. Turn the GTS on.
      7. Using the GTS, clear the linear solenoid valve offset, SM solenoid valve offset, brake pedal stroke sensor assembly zero point, system information, and yaw rate and acceleration sensor zero point. Enter the following menus: Chassis / Brake/EPB* / Utility / Reset Memory.

        *: Electric Parking Brake System

        Chassis > Brake/EPB > Utility 

        Tester Display
        Reset Memory
        NOTE:

        When performing "Reset Memory", each warning light or indicator light illuminates or flashes, and a DTC indicating that learning is incomplete and/or vehicle control history is stored.

      8. Turn the ignition switch off.
        NOTE:

        If the ignition switch is turned to ON for more than 15 seconds with the shift lever in P 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 No. 2 skid control ECU (brake actuator assembly) will store the zero point calibration for the acceleration sensor as not being completed. The No. 2 skid control ECU (brake actuator assembly) will then also indicate this as a malfunction of the VSC system using the indicator light.

    3. Perform linear solenoid valve offset learning, SM solenoid valve offset learning, brake pedal stroke sensor assembly zero point calibration, system information memorization, and yaw rate and acceleration sensor zero point calibration.
      NOTE:

      This procedure can be performed only once per trip. For that reason, if it is necessary to perform learning again, turn the ignition switch off for 4 minutes or more before turning the ignition switch to ON again.

      HINT: 

      • When Dealer Mode (Calibration) is entered, linear solenoid valve offset learning, SM solenoid valve offset learning, brake pedal stroke sensor assembly zero point calibration, system information memorization, and yaw rate and acceleration sensor zero point calibration will be performed automatically.
      • If linear solenoid valve offset learning has not been performed, DTC C1345-00 or C1345-51 is stored.
      • If SM solenoid valve offset learning has not been performed, DTC C13B9-51 is stored.
      • If brake pedal stroke sensor assembly zero point calibration has not been performed, DTC C05C0-00, C05C0-51, C05C1-00 or C05C1-51 is stored.
      • If system information memorization has not been performed, DTC C124A-00, C124A-05 or C136F-00 is stored.
      • If yaw rate sensor zero point calibration has not been performed, DTC C1210-54 or X204C is stored.
      • If acceleration sensor zero point calibration has not been performed, DTC C051D-00 or C051D-54 is stored.
      1. Turn the ignition switch off.
      2. Check that the steering wheel is centered.
      3. Check that the shift lever is in P.
      4. Connect the GTS to the DLC3.
      5. Turn the ignition switch to ON.
      6. Check that the parking brake is released.
        NOTE:
        • If the parking brake is not released, linear solenoid valve offset learning and SM solenoid valve offset learning cannot be performed.
        • If the parking brake is engaged during linear solenoid valve offset learning and SM solenoid valve offset learning, learning will be suspended.

          In this case, learning will resume when the parking brake is released.

        • After replacing the brake actuator assembly, the parking brake indicator light (red) blinks when the ignition switch is turned to ON for the first time. To turn off the parking brake indicator light (red) after replacing the brake actuator assembly, operate the electric parking brake switch (electric parking brake switch assembly) to the lock side then to the release side.
      7. Turn the GTS on.
      8. Switch the skid control ECU to Dealer Mode (Calibration) using the GTS. Enter the following menus: Chassis / Brake/EPB* / Utility / Calibration.

        *: Electric Parking Brake System

        Chassis > Brake/EPB > Utility 

        Tester Display
        Calibration
      9. Wait for approximately 4 minutes with the vehicle stopped without depressing the brake pedal and confirm that the ABS warning light, brake system warning light (yellow indicator) and slip indicator light flash the Dealer Mode pattern (blinks at 0.25 second intervals).
        NOTE:
        • Do not depress the brake pedal when performing "Calibration".
        • If Dealer Mode is entered when the shift position is in a position other than P, DTC C051D-00, C051D-54 or C1210-54 is stored.

        HINT: 

        • An auxiliary battery voltage of 10 V or more is required during learning. If the auxiliary battery voltage drops below 10 V, learning may be canceled. The time required for learning changes depending on the auxiliary battery voltage.
        • If linear solenoid valve offset learning does not complete, DTCs C1345-00 or C1345-51 will be stored. In this case, perform learning again after clearing the DTCs and turning the ignition off.
        • If SM solenoid valve offset learning does not complete, DTC C13B9-51 will be stored. In this case, perform learning again after clearing the DTCs and turning the ignition off.
        • After "Calibration" completes, the ABS warning light, brake system warning light (yellow indicator) and slip indicator light flash the Dealer Mode pattern (blinks at 0.25 second intervals).
      10. Check that "complete" is displayed for Dealer Mode (Signal Check) Inspection Item "Learning of Stroke Sensor Zero Point".
      11. Turn the ignition switch off.
      12. Disconnect the GTS.
  4. ALL READINESS 

    HINT: 

    • With "All Readiness", you can check whether or not the DTC judgment has been completed by using the GTS.
    • You should check "All Readiness" after simulating malfunction symptoms or for validation after finishing repairs.
    1. Turn the ignition switch off.
    2. Connect the GTS to the DLC3.
    3. Turn the ignition switch to ON
    4. Turn the GTS on.
    5. Clear the DTCs even if no DTCs are stored. Enter the following menus: Chassis / Brake Booster / Trouble Codes.

      Chassis > Brake Booster > Clear DTCs 

    6. Clear the DTCs even if no DTCs are stored. Enter the following menus: Chassis / Brake/EPB* / Trouble Codes.

      *: Electric Parking Brake System

      Chassis > Brake/EPB > Clear DTCs 

    7. Press the clear button.
    8. Turn the ignition switch off.
    9. Turn the ignition switch to ON (READY).
    10. Perform the DTC judgment driving pattern to run the DTC judgment.
    11. Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.

      Chassis > Brake Booster > Utility 

      Tester Display
      All Readiness
    12. Enter the following menus: Chassis / Brake/EPB* / Utility / All Readiness.

      *: Electric Parking Brake System

      Chassis > Brake/EPB > Utility 

      Tester Display
      All Readiness
    13. Input the DTC to be confirmed.
    14. Check the DTC judgment result.
      GTS Display Description
      Normal
      • DTC judgment completed
      • System normal
      Abnormal
      • DTC judgment completed
      • System abnormal
      Incomplete
      • DTC judgment not completed
      • Perform the driving pattern
      N/A
      • Unable to perform DTC judgment
      • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
      • Perform the driving pattern

      If the judgment result shows Incomplete or N/A, perform the DTC confirmation driving pattern again.

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