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Electronically Controlled Brake System: Initialization

  1. DESCRIPTION 
    1. Perform initialization of linear solenoid valve and calibration when the skid control ECU, brake actuator or brake pedal stroke sensor is replaced. Follow the procedure to perform initialization.

      HINT:

      • If there is a problem with battery (12 V) voltage, initialization of linear solenoid valve and calibration cannot be completed normally. Check the battery voltage before performing initialization of linear solenoid valve and calibration.
      • If the actuator's temperature is high, initialization of linear solenoid valve and calibration may not be completed normally. If so, wait until the temperature drops and then perform initialization of linear solenoid valve and calibration.
      • If the engine switch is turned off, the brake pedal is operated or the vehicle speed is input while the linear solenoid valve offset learning is being performed, the learning will be canceled.
        NECESSARY OPERATION CHART

        Replacement Parts Necessary Operation
        Skid control ECU Initialization of linear solenoid valve and calibration
        Brake actuator
        1. Bleed air
        2. Clearing stored value of linear solenoid valve and calibration data
        3. Initialization of linear solenoid valve and calibration
        • Brake pedal stroke sensor
        • Brake pedal
        1. Inspection and adjustment of brake pedal height
        2. Clearing stored value of linear solenoid valve and calibration data
        3. Initialization of linear solenoid valve and calibration
  2. CLEAR STORED VALUE OF INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING TECHSTREAM) 
    1. Connect the Techstream to the DLC3.
    2. Move the shift lever to the P position.
    3. Turn the engine switch on (IG) with the brake pedal released.
    4. Clear the stored value of initialization of linear solenoid valve and calibration following the screen.

      HINT:

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

  3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING TECHSTREAM) 
    1. Connect the Techstream to the DLC3.
    2. Move the shift lever to the P position.
    3. Turn the engine switch on (IG) with the brake pedal released.
      NOTE:
      • If the linear solenoid valve offset learning is performed without turning the engine switch on (IG), the learning process may not be completed properly because of insufficient battery voltage.
      • When the linear solenoid valve offset learning is interrupted, or the learning process is performed with the shift lever not in the P position, DTC C1345/66 will be stored.
    4. Set the Techstream to Test Mode (select "ABS/VSC/TRAC", "Utility").

      HINT:

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

    5. Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.
    6. Check that the interval between blinks of the brake warning light/yellow (minor malfunction) changes from 1 second to 0.25 second.

      HINT:

      • The time needed to complete initialization of linear solenoid valve and calibration varies depending on battery voltage.
      • The brake warning light/yellow (minor malfunction) blinks at 1 second intervals during the initialization of linear solenoid valve and calibration. After it is complete, the brake warning light/yellow (minor malfunction) changes to the Test Mode display, and blinks at 0.25 second intervals.
        Fig 1: Brake Control Warning Light Blinking Pattern
        G04949562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. When the brake warning light/yellow (minor malfunction) changes to the Test Mode display, check that DTC C1345/66, which indicates trouble with stroke sensor zero point learning, is not output.
    8. Enter the normal mode from the Test Mode following the Techstream prompts.

      HINT:

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

  4. CLEAR STORED VALUE OF INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING SST CHECK WIRE) 
    1. Move the shift lever to the P position.
    2. Turn the engine switch on (IG) with the brake pedal released.
    3. Using SST, connect and disconnect terminals 12 (TS) and 4 (CG) of the DLC3 4 times or more within 8 seconds.

      SST 09843-18040 

      Fig 2: Identifying DLC3 Connector Terminals CG And TS
      G04949563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check that no codes other than ABS code 42, VSC code 45 and electronically controlled brake system code 48, 66, or 95 are stored in the diagnostic system.
      Fig 3: ABS Blinking Pattern
      G04949564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The ABS warning light and multi-information display do not indicate the normal system code.

  5. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING SST CHECK WIRE) 
    1. Turn the engine switch off.
    2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST 09843-18040 

    3. Move the shift lever to the P position.
    4. Turn the engine switch on (IG) with the brake pedal released.
      NOTE:
      • If the linear solenoid valve offset learning is performed without turning the engine switch on (IG), the learning process may not be completed properly because of insufficient battery voltage.
      • When the linear solenoid valve offset learning is interrupted, or the learning process is performed with the shift lever not in the P position, DTC C1345/66 will be stored.
        Fig 4: Identifying DLC3 Connector Terminals CG And TS
        G04949563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.
    6. Check that the interval between blinks of the brake warning light/yellow (minor malfunction) changes from 1 second to 0.25 seconds.

      HINT:

      • The time needed to complete initialization of linear solenoid valve and calibration varies depending on the battery voltage.
      • The brake warning light/yellow (minor malfunction) blinks at 1 second intervals during the initialization of linear solenoid valve and calibration. After it is complete, the brake warning light/yellow (minor malfunction) changes to the Test Mode display, and blinks at 0.25 second intervals.
        Fig 5: Brake Control Warning Light Blinking Pattern
        G04949562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. When the brake warning light/yellow (minor malfunction) changes to the Test Mode display, check that DTC C1345/66, which indicates trouble with stroke sensor zero point learning, is not output.
    8. Turn the engine switch off and disconnect SST from the DLC3.
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