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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 power switch is turned OFF, brake pedal is operated or vehicle speed is input while the linear solenoid valve offset learning is being performed, the learning will be canceled.
        REPLACEMENT PARTS

        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 INTELLIGENT TESTER) 
    1. Connect the intelligent tester (with CAN VIM) to the DLC3.
      Fig 1: Connecting Intelligent Tester To DLC3
      G05298631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Move the shift lever to the P position.
    3. Turn the power switch ON (IG) with the brake pedal released.
    4. Perform the RESET MEMORY function under the ABS/VSC MENU.
      Fig 2: Diagnostic Menu ABS/VSC - Screen Display
      G05305897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Perform initialization of linear solenoid valve.
    6. Perform zero point calibration of yaw rate and acceleration sensor (See CALIBRATION  ).
  3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING INTELLIGENT TESTER) 
    1. Connect the intelligent tester (with CAN VIM) to the DLC3.
    2. Move the shift lever to the P position.
    3. 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 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 intelligent tester to Test Mode (select "Electronically Controlled Brake System", "Utility").

      HINT:

      Refer to the intelligent tester 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 control warning light changes from 1 second to 0.25 seconds.

      HINT:

      • The time needed to complete initialization of linear solenoid valve and calibration varies depending on battery voltage.
      • The brake control warning light blinks at 1 second intervals during the initialization of linear solenoid valve and calibration. The brake control warning light blinks at 0.25 seconds intervals if the Test Mode is normal.
        Fig 3: Brake Control Warning Light Blinking Pattern
        G04949562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. When the brake control warning light 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 intelligent tester prompts.

      HINT:

      Refer to the intelligent tester 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 power 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 4: Identifying DLC3 Connector Terminals
      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 5: ABS Code Blinking Pattern
      G05297006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

    5. Remove SST from the terminals of the DLC3.
    6. Using the check wire, perform initialization of linear solenoid valve and calibration.
  5. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION (WHEN USING SST CHECK WIRE) 
    1. Turn the power switch OFF.
    2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST 09843-18040 

      Fig 6: Identifying DLC3 Connector Terminals
      G04949563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Move the shift lever to the P position.
    4. 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 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.
    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 control warning light 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 control warning light blinks at 1 second intervals during the initialization of linear solenoid valve and calibration and changes to the Test Mode display.
      • The brake control warning light blinks at 0.25 seconds intervals if the Test Mode is normal.
        Fig 7: Brake Control Warning Light Blinking Pattern
        G04949562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. When the brake control warning light 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 power switch OFF and disconnect SST from the DLC3.
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