ELECTRONICALLY CONTROLLED BRAKE SYSTEM INITIALIZATION


  1. DESCRIPTION


    1. Perform initialization and calibration of the linear solenoid valve when the skid control ECU, brake actuator or brake pedal stroke sensor 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, the brake pedal is depressed or vehicle speed signal is input while the linear solenoid valve offset learning is being performed, the learning will be cancelled.

      Part to be Replaced Necessary Operation
      Skid control ECU Initialization and calibration of the linear solenoid valve
      Brake actuator assembly
      1. Bleed air

      2. Clearing stored linear solenoid valve calibration data

      3. Initialization and calibration of the linear solenoid valve


      • Brake pedal stroke sensor

      • Brake pedal


      1. Inspection and adjustment of brake pedal height

      2. Clearing stored linear solenoid valve calibration data

      3. Initialization and calibration of the linear solenoid valve

  2. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE (When Using the Intelligent Tester)


    1. Clear the stored linear solenoid valve calibration data.


      1. Turn the power switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. Connect the intelligent tester to the DLC3.

      5. Turn the power switch on (IG).

      6. Turn the intelligent tester on.

      7. Select the skid control ECU to clear the linear solenoid valve calibration data using the intelligent tester. Enter the following menus: Chassis / ABS/VSC/TRC / Reset Memory.

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

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

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


      1. Turn the power switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. Connect the intelligent tester to the DLC3.

      5. 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 the shift lever not in P, DTC C1345 (Linear Solenoid Valve Offset Learning Undone) will be stored.

      6. Turn the intelligent tester on.

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

        *: Electronically Controlled Brake System

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

      9. A01NH9KE84

        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.

      10. 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.

      11. Enter the normal mode from the Test Mode following the intelligent tester directions.

        Tech Tips

        Refer to the intelligent tester operator's manual for further details.

  3. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE (When not Using the Intelligent Tester)


    1. Clear the stored linear solenoid valve calibration data.


      1. Turn the power switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

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

      5. A01NH42E13
        Text in Illustration
        *1 Front view of DLC3

        Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds.

        SST
        09843-18040
      6. 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.

        A01NDCCE01

        Tech Tips

        The ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not indicate a normal system code.

      7. Remove SST from the terminals of the DLC3.

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

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

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


      1. Turn the power switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. A01NH42E13
        Text in Illustration
        *1 Front view of DLC3

        Using SST, connect terminals TS and CG of the DLC3.

        SST
        09843-18040
      5. 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 the shift lever not in P, DTC 66 (Linear Solenoid Valve Offset Learning Undone) will be stored.

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

      7. A01NH9KE84

        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 the 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 Test Mode is normal.

      8. Check that DTC 66 (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.

      9. Turn the power switch off and disconnect SST from the DLC3.