Nissan X-Trail 32. Manual - part 140

BRC-26

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

COMPONENT PARTS

• 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 limited slip dif-
ferential (BLSD) function, brake assist function, brake force distribution function, hill start assist function and
advanced hill descent control function (4WD models with gasoline engine) 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, hill start assist function and
advanced hill descent control function (4WD models with gasoline engine) 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 elec-
tric 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).]

COMPONENT PARTS

BRC-27

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

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BRC

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Wheel Sensor and Sensor Rotor

INFOID:0000000010723624

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

CAUTION:

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

• Sensor rotor of front wheel is integrated in wheel hub assembly.
• Wheel sensor of rear wheel is installed on wheel hub assembly.

(2WD models)

CAUTION:

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

• Wheel sensor of rear wheel is installed on rear axle housing. (4WD

models)

CAUTION:

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

• Sensor rotor of rear wheel is integrated in wheel hub assembly. (2WD models)
• Sensor rotor of rear wheel is installed on drive shaft (wheel side).

(4WD models)

• 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.

Steering Angle Sensor

INFOID:0000000010723625

Detects the following information and transmits steering angle sen-
sor signal to ABS actuator and electric unit (control unit) via CAN
communication.
• Steering wheel rotation amount
• Steering wheel rotation angular velocity
• Steering wheel rotation direction

JSFIA1272ZZ

JSFIA1567ZZ

JPFIC0131GB

JSFIA2318ZZ

BRC-28

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

COMPONENT PARTS

VDC (ESP) OFF Switch

INFOID:0000000010723626

• Non-operational status or standby status of the following functions

can be selected using VDC OFF switch. VDC OFF indicator lamp
indicates the operation status of function. (ON: Non-operational
status, OFF: Standby status)

- VDC function
- TCS function
- Active trace control function (control of chassis control module)
- Active ride control function (control of chassis control module)
NOTE:
ABS function, EBD function, Brake limited slip differential (BLSD)
function, brake assist function, brake force distribution function, hill
start assist function and advanced hill descent control function (4WD
models with gasoline engine) control operates.
• VDC OFF indicator lamp turns OFF (standby status) when the engine is started again after it is stopped once

while VDC OFF indicator lamp is ON (non-operational status).

hill descent control (Downhill Drive Support) Switch

INFOID:0000000010723627

The operation of the hill descent control switch enables the arbitrary
switching of the advanced hill descent control function between stop
status and standby status. The status of the function is indicated by
the hill descent control indicator lamp.
• ON: 
- When advanced hill descent control function is under operating

condition

- Advanced hill descent control function operating or operational

(condition is satisfied)

• Blinking: Advanced hill descent control function operating or oper-

ational (condition is not satisfied)

• OFF: Advanced hill descent control function switch OFF (non-

operational status) 

NOTE:
Applied to 4WD models with gasoline engine.

Brake Fluid Level Switch

INFOID:0000000010723628

Detects the brake fluid level in reservoir tank and transmits con-
verted 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.

JSFIA1148ZZ

JSFIA2255ZZ

JSFIA2256ZZ

COMPONENT PARTS

BRC-29

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

C

D

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Brake Vacuum Sensor

INFOID:0000000010723629

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

JSFIA2257ZZ