DESCRIPTION
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.
Tech Tips
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 ignition switch is turned off, brake pedal is depressed, parking brake is applied or vehicle speed signal is input while linear solenoid valve offset learning is being performed, learning will be canceled.
Part to be Replaced | Necessary Operation |
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Brake booster with master cylinder assembly | Initialization and calibration of the linear solenoid valve |
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PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE (When Using the GTS)
Note
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 has been replaced, or the 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 Click here.
Clear the stored linear solenoid valve calibration data.
Turn the ignition switch off.
Check that the steering wheel is centered.
Check that the shift lever is in P.
Connect the GTS to the DLC3.
Turn the ignition switch to ON (IG).
Turn the GTS on.
Select the skid control ECU to clear the linear solenoid valve calibration data using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Reset Memory.
Perform initialization and calibration of the linear solenoid valve.
Turn the ignition switch off.
Check that the steering wheel is centered.
Check that the shift lever is in P.
Check that the parking brake is released.
Note
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.
Connect the GTS to the DLC3.
Turn the ignition switch to ON (IG) with the brake pedal released.
Note
If linear solenoid valve offset learning is performed without turning the ignition switch to 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.
Turn the GTS on.
Switch the skid control ECU to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / ECB* Utility / Linear Valve Offset.
*: Electronically Controlled Brake System
Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.
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 then changes to the Test Mode blinking pattern.
The brake warning light / yellow (minor malfunction) blinks at 0.25 second intervals if the Test Mode is normal.
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.
Perform zero point calibration of the yaw rate and acceleration sensor Click here.
Return to normal mode from Test Mode following the GTS directions.
Tech Tips
Refer to the GTS operator's manual for further details.
Turn the ignition switch off and disconnect the GTS.
PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE (When not Using the GTS)
Note
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 has been replaced, or the 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 Click here.
Clear the stored linear solenoid valve calibration data.
Turn the ignition switch off.
Check that the steering wheel is centered.
Check that the shift lever is in P.
Check that the parking brake is released.
Note
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.
Turn the ignition switch to ON (IG) with the brake pedal released.
*a | Front view of DLC3 |
Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds.
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.
Tech Tips
How to read DTCs:
Diagnostic trouble codes are represented by the number of blinks of a warning light. For example, code 21 would be shown by 2 blinks, a pause of 1.5 seconds, and then 1 blink.
If one code is detected:
The light repeats the same code after a pause of 4 seconds.
If multiple codes are detected:
The light outputs one code after another with a 2.5-second pause between each code. When all codes have been output, there is a 4-second pause and then the light begins to output the codes again.
The ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not indicate a normal system code.
Perform initialization and calibration of the linear solenoid valve.
Turn the ignition switch off.
Check that the steering wheel is centered.
Check that the shift lever is in P.
*a | Front view of DLC3 |
Using SST, connect terminals TS and CG of the DLC3.
Turn the ignition switch to ON (IG) with the brake pedal released.
Note
If the linear solenoid valve offset learning is performed without turning the ignition switch to 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.
Leave the vehicle stationary without depressing the brake pedal for 1 or 2 minutes.
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 blinking pattern.
The brake warning light / yellow (minor malfunction) blinks at 0.25 second intervals if Test Mode is normal.
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 blinking pattern upon completion of initialization and calibration of the linear solenoid valve completion.
Perform the zero point calibration of the yaw rate and acceleration sensor Click here.
Turn the ignition switch off and disconnect SST from the DLC3.