ABS Actuator and Electric Unit (Control Unit)

The ABS actuator and electric unit (control unit) is located in the right side of the engine room. Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS function, ABS function, EBD function, brake assist function, bake force distribution function and hill start assist function.

Courtesy of NISSAN NORTH AMERICA, INC.

CONTROL UNIT

Controls ABS and other ECUs based on inputs from sensors.
Brake fluid pressure, engine and transaxle 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 brake fluid to reservoir when wheel pressure is decreased.
Pressure the brake fluid and send.
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

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.

Cut Valve 1, Cut Valve 2

Shuts off the ordinary brake line from master cylinder, when VDC function, TCS function, brake assist function, brake force distribution function and hill start assist function are activated.

NOTE:

Valve is a solenoid valve.

Suction Valve 1, Suction Valve 2

Supplies the brake fluid from master cylinder to the pump, when VDC function, TCS function, brake assist function, brake force distribution function and hill start assist function are activated.

NOTE:

Valve is a solenoid valve.

Inlet Valve

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

NOTE:

Valve is a solenoid valve.

Outlet Valve

Brake fluid discharged from the pump does not backflow.

NOTE:

Valve is a solenoid 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 and wheel cylinder, so that pressure efficiently decreases when decreasing pressure of brake caliper.

Yaw Rate/Side/Decel G Sensor

Calculates the following information that affects the vehicle, and transmits a signal to ABS actuator and electric unit (control unit) via communication lines. [Yaw rate/side/decel G sensor is integrated in ABS actuator and electric unit (control unit).]

Vehicle rotation angular velocity (yaw rate signal)
Vehicle lateral acceleration (side G signal) and longitudinal acceleration (decel G signal)

Pressure Sensor

Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit). [Pressure sensor is integrated in ABS actuator and electric unit (control unit).]