Nissan Rogue (T33) 2021-Present Service Manual: Component Parts

Brake Control System

Component Parts Location

ABS Actuator and Electric Unit (Control Unit)

FUNCTIONS WITHIN THE SYSTEM

Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS function, ABS function, EBD function, Brake limited slip differential (BLSD) function, Brake assist function, bake force distribution function, hill start assist function and electric parking brake function.

INDIVIDUAL FUNCTIONS WITHIN THE SYSTEM

ELECTRIC UNIT (CONTROL UNIT)

• 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

• Pressurizes brake fluid in the master cylinder.

• Returns the brake fluid to the reservoir of the 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 limited slip differential (BLSD) 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 limited slip differential (BLSD) 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).]

INDIVIDUAL OPERATION

• Brake fluid pressure, and traction motor are controlled according to signals from each sensor.

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

PARTS LOCATION

Refer to Component Parts Location.

Wheel Sensor and Sensor Rotor

FUNCTIONS WITHIN THE SYSTEM

Wheel sensor and sensor rotor detect each wheel speed. And wheel sensor inputs wheel speed signal to ABS actuator and electric unit (control unit).

INDIVIDUAL FUNCTIONS WITHIN THE SYSTEM

The wheel sensor reads a magnetic field change.

INDIVIDUAL OPERATION

• 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.

PARTS LOCATION

Refer to Component Parts Location.

Steering Angle Sensor

FUNCTIONS WITHIN THE SYSTEM

Steering angle sensor transmits steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication.

INDIVIDUAL FUNCTIONS WITHIN THE SYSTEM

Steering angle sensor detects the following status.

• Steering wheel rotation amount

• Steering wheel rotation angular velocity

• Steering wheel rotation direction

INDIVIDUAL OPERATION

Steering angle sensor converts the rotation amount, rotation angular velocity and rotation direction of the steering wheel as the steering angle sensor signal.

PARTS LOCATION

Refer to Component Parts Location.

Brake Fluid Level Switch

FUNCTIONS WITHIN THE SYSTEM

Detects the brake fluid level in reservoir tank and transmits converted electric signal from combination meter to ABS actuator and electric unit (control unit) via CAN communication, when brake fluid level is the specified level or less.

INDIVIDUAL FUNCTIONS WITHIN THE SYSTEM

Brake fluid level switch detects the brake fluid level in reservoir tank.

INDIVIDUAL OPERATION

• The switch is turned ON when brake fluid level is the specified level or less.

  

• Ground is supplied as the switch signal to the control unit when the switch is ON.

PARTS LOCATION

Refer to Component Parts Location.

Brake Vacuum Sensor

FUNCTIONS WITHIN THE SYSTEM

Detects the vacuum in brake booster and transmits converted electric signal to ABS actuator and electric unit (control unit).

INDIVIDUAL FUNCTIONS WITHIN THE SYSTEM

Detects the vacuum in brake booster.

INDIVIDUAL OPERATION

Brake vacuum sensor converts the brake vacuum sensor signal.

PARTS LOCATION

Refer to Component Parts Location.