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Nissan Versa Note. Manual - part 111

BRC-8

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

COMPONENT PARTS

Component Description

INFOID:0000000009364880

ABS Actuator and Electric Unit (Control Unit)

INFOID:0000000009364881

Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS func-

tion, ABS function and EBD function.

ELECTRIC UNIT (CONTROL UNIT)

• Brake fluid pressure is 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.

ABS OUT Valve

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

Cut Valve 1, Cut Valve 2

Shuts off the ordinary brake line from master cylinder, when VDC function and TCS function are activated.

Suction Valve 1, Suction Valve 2

Supplies the brake fluid from master cylinder to the pump, when VDC function and TCS function are activated.

Return Check Valve

Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each

valve when brake is released.

Reservoir

View with steering wheel and spiral
cable removed

Left side of instrument panel

Left side of engine compartment

Right side of engine compartment

Left front wheel assembly

Near brake pedal area

View with console removed

Left rear wheel assembly

Component

Reference/Function

Steering angle sensor

BRC-9, "Steering Angle Sensor"

VDC OFF switch

BRC-9, "VDC OFF Switch"

IPDM E/R

PCS-5, "Component Parts Location"

Brake fluid level switch

BRC-9, "Brake Fluid Level Switch"

ABS actuator and electric unit (control unit)

BRC-8, "ABS Actuator and Electric Unit (Control Unit)"

Front wheel sensor

BRC-9, "Wheel Sensor and Sensor Rotor"

Stop lamp switch

BRC-9, "Stop Lamp Switch"

Parking brake switch

BRC-9, "Parking Brake Switch"

Rear wheel sensor

BRC-9, "Wheel Sensor and Sensor Rotor"

Combination meter

MWI-6, "METER SYSTEM : Combination Meter"

COMPONENT PARTS

BRC-9

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

BRC

Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when

decreasing pressure of brake caliper and wheel cylinder.

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.

• 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).

Wheel Sensor and Sensor Rotor

INFOID:0000000009364882

NOTE:

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

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

• Wheel sensor of rear wheel is installed on back plate of rear brake.

• Sensor rotor of rear wheel is installed on rear brake drum.

• 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.

Stop Lamp Switch

INFOID:0000000009364883

Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-

tric unit (control unit).

Steering Angle Sensor

INFOID:0000000009364884

Detects the following information and transmits steering angle 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

VDC OFF Switch

INFOID:0000000009364885

• Non-operational status or standby status of VDC and TCS 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 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).

Brake Fluid Level Switch

INFOID:0000000009364886

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.

Parking Brake Switch

INFOID:0000000009364887

Detects the operation status of parking brake switch and transmits converted electric signal from combination

meter to ABS actuator and electric unit (control unit) via CAN communication.

JPFIC0131GB

BRC-10

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

SYSTEM

VDC/TCS/ABS
VDC/TCS/ABS : System Diagram

INFOID:0000000009364888

VDC/TCS/ABS : System Description

INFOID:0000000009364889

• The system switches fluid pressure of each brake caliper and each wheel cylinder to increase, to hold, or to

decrease according to signals from control unit in ABS actuator and electric unit (control unit). This control

system is applied to VDC, TCS, ABS and EBD functions.

• Fail-safe function is available for each function and is activated by each function when system malfunction

occurs.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

AWFIA0806GB

SYSTEM

BRC-11

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

BRC

VALVE OPERATION (VDC AND TCS FUNCTIONS)

The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-

ipers by operating each valve.

VDC and TCS Functions are Operating (Pressure Increases)

Component

Signal description

Steering angle sensor

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

ECM

Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal

TCM

Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.

Combination meter

Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• Parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• ABS warning lamp signal
• Brake warning lamp signal
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal

JSFIA0670GB

Name

Not activated

Pressure increases

Cut valve 1

Power supply is not supplied (open)

Power supply is supplied (close)

Cut valve 2

Power supply is not supplied (open)

Power supply is supplied (close)

Suction valve 1

Power supply is not supplied (close)

Power supply is supplied (open)

Suction valve 2

Power supply is not supplied (close)

Power supply is supplied (open)

ABS IN valve

Power supply is not supplied (open)

Content .. 109 110 111 112 ..