Component Parts Location

LHD

1. ABS actuator and electric unit (control unit)
2. Front wheel sensor
3. Stop lamp switch
4. Rear wheel sensor

A. Inside engine room B. Steering knuckle
C. Brake pedal
D. ABS warning lamp, brake warning lamp (in combination meter) E. Rear wheel hub and bearing assembly

RHD

1. Stop lamp switch
2. Front wheel sensor
3. ABS actuator and electric unit (control unit)
4. Rear wheel sensor

A. ABS warning lamp, brake warning lamp (in combination meter) B. Brake pedal
C. Steering knuckle
D. Inside engine room
E. Rear wheel hub and bearing assembly

Component Description

Wheel Sensor and Sensor Rotor

NOTE

:
• Wheel sensor of front wheel is installed on steering knuckle.

• Sensor rotor of front wheel is integrated in wheel hub and bearing assembly.

• Wheel sensor of rear wheel is installed on wheel hub and bearing assembly.

• Sensor rotor of rear wheel is integrated in wheel hub and bearing assembly.

• Never measure resistance and voltage value using a tester because sensor is active sensor.

• Downsize and weight reduction is aimed. IC for detection portion and magnet for sensor rotor are adopted.

• Power supply is supplied to detection portion so that magnetic field line is read. Magnetic field that is detected is converted to current signal.

• When sensor rotor rotates, magnetic field changes. Magnetic field change is converted to current signals (rectangular wave) and is transmitted to ABS actuator and electric unit (control unit). Change of magnetic field is proportional to wheel speed.

ABS Actuator and Electric Unit (Control Unit)

Electric unit (control unit) is integrated with actuator and comprehensively controls ABS function and EBD function.

ELECTRIC UNIT (CONTROL UNIT)

• Brake fluid pressure are controlled according to signals from each sensor.

• If malfunction is detected, the system enters fail-safe mode.

ACTUATOR

The following components are integrated with ABS actuator.

Pump
Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.

Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).

Motor Relay
Operates the motor ON/OFF according to signals from ABS actuator and electric unit (control unit).

Actuator Relay (Main Relay) Operates each valve ON/OFF according to signals from ABS actuator and electric unit (control unit).

ABS IN Valve
Switches the fluid pressure line to increase or hold according to signals from control unit.

NOTE

:
Valve is a solenoid valve.

ABS OUT Valve
Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.

NOTE

:
Valve is a solenoid valve.

Inlet Valve
Brake fluid sucked from the reservoir by the pump does not backflow.

NOTE

:
Valve is a check valve.

Outlet Valve
Brake fluid discharged from the pump does not backflow.

NOTE

:
Valve is a check valve.

Return Check Valve
Returns the brake fluid from brake caliper to master cylinder by bypassing orifice of each valve when brake is released.

Reservoir
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when decreasing pressure of brake caliper.

Stop Lamp Switch

Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and electric unit (control unit).