- Brake pedal stroke sensor assembly
- Brake pedal
Lexus NX: Initialization
INITIALIZATION
DESCRIPTION
(a) Perform initialization and calibration of the linear solenoid valve when the brake booster with master cylinder assembly, brake pedal stroke sensor assembly or brake pedal is replaced.
Follow the procedure to perform initialization.
HINT:
- If there is a problem with the auxiliary battery (12 V) voltage, initialization and calibration of the linear solenoid valve cannot complete normally. Make sure to check the auxiliary battery voltage before performing initialization and calibration of the linear solenoid valve.
- If the actuator temperature is high, initialization and calibration of the linear solenoid valve may not complete 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, the parking brake is applied or the vehicle speed signal is input while linear solenoid valve offset learning is being performed, learning will be canceled.
| Part to be Replaced | Necessary Operation |
|---|---|
| Brake booster with master cylinder assembly | Perform initialization and calibration of the linear solenoid valve. |
| |
|
PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE
NOTICE:
If the brake pedal stroke sensor assembly or brake pedal has been replaced, it is necessary to perform linear solenoid valve learning.
If the brake booster with master cylinder assembly, brake booster pump assembly or brake master cylinder reservoir assembly has been replaced, linear solenoid valve learning will be automatically performed during the Bleed Brake System procedure.
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(a) 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 Techstream to the DLC3.
(5) Turn the power switch on (IG).
(6) Turn the Techstream on.
(7) Select the skid control ECU (brake booster with master cylinder assembly) to clear the linear solenoid valve calibration data using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Reset Memory.
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| Reset Memory |
(b) Perform initialization and calibration of the linear solenoid valve.
(1) Turn the power switch on (IG).
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
(4) Check that the parking brake is released.
NOTICE:
Linear valve offset learning cannot be started with the parking brake applied. If the parking brake is applied during offset learning, the learning process will be canceled and then restarted when the parking brake is released.
(5) Turn the power switch off.
(6) Connect the Techstream to the DLC3.
(7) Turn the power switch on (IG) with the brake pedal released.
NOTICE:
- If 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 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.
(8) Turn the Techstream on.
(9) Switch the skid control ECU (brake booster with master cylinder assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / ECB* Utility / Linear Valve Offset.
*: Electronically Controlled Brake System
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| ECB Utility |
(10) Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.
(11) 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 of the linear solenoid valve and calibration. 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.
(12) 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 blinking pattern upon completion of initialization and calibration of the linear solenoid valve.
(13) Perform zero point calibration of the yaw rate and acceleration sensor.
Click here
(14) Return to normal mode from Test Mode following the Techstream directions.
HINT:
Refer to the Techstream operator's manual for further details.
(15) Turn the power switch off and disconnect the Techstream.
READ NEXT:
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