System Outline

ANTILOCK BRAKE SYSTEM
This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left front wheel and rear wheel when the brakes are applied in a panic stop so that the wheels do not lock.

This results in improved directional stability and steerability during panic braking.

1. Input Signals
(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the ABS ECU.

(2) Stop light SW signal
A signal is input to TERMINAL STP of the ABS ECU when brake pedal is depressed.

(3) Deceleration sensor signal
Longitudinal and lateral acceleration is detected and input to the ABS ECU.

2. System Operation
During sudden braking, the ABS ECU which has signals input from each sensor controls the current flowing to the solenoid inside the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The pump inside the actuator is also operating at this time and it returns the brake fluid from the reservoir to the master cylinder, thus preventing locking of the vehicle wheels.

If the ABS ECU judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current acting on solenoid is controlled and the hydraulic pressure is increased, Holding of the hydraulic pressure is also controlled by the ABS ECU, by the same method as above, by repeated pressure reduction, holding and increase are repeated to maintain vehicle stability and to improve steerability during sudden braking.

TRACTION CONTROL SYSTEM
Traction control is the system to realize a favorable accelerator controllability by making the engine output most appropriate for the acceleration under each driving condition provided by the throttle ECU.

Traction off SW
This is the switch to stop the operation of slip control. After starting the engine pressing the switch one time under the condition that the snow indicator does not light on, makes it in the operation stop condition (OFF), and pressing it one more time makes it in the operation waiting condition. In addition, restarting after the engine stop makes it in the operation waiting condition without concerning the traction off SW.

Snow mode SW
This is the switch to fix low Mu load control at the time of driving on a slippery road such as snowy road. After starting the engine, pressing the switch makes it fix at low Mu load control and snow indicator light comes on. In addition, restarting after the engine stop makes it always in normal condition (Auto mode) without concerning the snow mode SW condition. Pressing the snow mode SW under operation prohibition condition of the traction (TRAC off indicator lights ON.) Cancels the operation prohibition of the traction and also fixes it at low Mu load control.

TRAC off indicator light
This light comes on by selecting the operation stop condition of the traction control with traction off SW and alerts the driver to be in operation stop condition and also alerts the driver by blinking in case of the occurence of the system malfunction.