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Initialization





BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: INITIALIZATION

1. DESCRIPTION

(a) 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.

HINT
* If there is a problem with the auxiliary battery voltage (12 V), 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 ignition switch is turned off, the brake pedal is depressed or a vehicle speed signal is input while the linear solenoid valve offset learning is being performed, the learning will be canceled.





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

(a) Clear the stored linear solenoid valve calibration data.

(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 Techstream to the DLC3.

(5) Turn the ignition switch to ON.

(6) Turn the Techstream on.

(7) Select the skid control ECU to clear the linear solenoid valve calibration data using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Reset Memory.

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

(9) Perform zero point calibration of the yaw rate and acceleration sensor Calibration.

(b) Perform initialization and calibration of the linear solenoid valve.

(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 Techstream to the DLC3.

(5) Turn the ignition switch to ON with the brake pedal released.

NOTICE:
* If the linear solenoid valve offset learning is performed without turning the ignition switch to ON, 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 Techstream on.

(7) Switch the skid control ECU to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / 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) 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 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. After initialization and calibration are complete, the brake warning light / yellow (minor malfunction) changes to the Test Mode display and blinks at 0.25-second intervals.

(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 completion of initialization and calibration of the linear solenoid valve.

(11) Enter normal mode from Test Mode by following the Techstream directions.

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

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

(a) Clear the stored linear solenoid valve calibration data.

(1) Turn the ignition switch off.

(2) Check that the steering wheel is centered.

(3) Check that the shift lever is in P.

(4) Turn the ignition switch to ON with the brake pedal released.

(5) Using SST, connect and disconnect terminals 12 (TS) and 4 (CG) of the DLC3 4 times or more within 8 seconds.





SST : 09843-18040

Text in Illustration





(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.





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

(7) Perform initialization and calibration of the linear solenoid valve.

(8) Perform zero point calibration of the yaw rate and acceleration sensor Calibration.

(b) Perform initialization and calibration of the linear solenoid valve.

(1) Turn the ignition switch off.

(2) Check that the steering wheel is centered.

(3) Check that the shift lever is in P.

(4) Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.





SST : 09843-18040

Text in Illustration





(5) Turn the ignition switch to ON with the brake pedal released.

NOTICE:
* If the linear solenoid valve offset learning is performed without turning the ignition switch to ON, 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) 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 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. After initialization and calibration are complete, the brake warning light / yellow (minor malfunction) changes to the Test Mode display and blinks at 0.25-second intervals.

(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 completion of initialization and calibration of the linear solenoid valve.

(9) Turn the ignition switch off and disconnect SST from the DLC3.
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