Nissan Note E12. Manual - part 79

COMPONENT PARTS

BRC-7

< SYSTEM DESCRIPTION >

[ABS]

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Component Description

INFOID:0000000009365050

ABS Actuator and Electric Unit (Control Unit)

INFOID:0000000009365051

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

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

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

decreasing pressure of brake caliper and wheel cylinder.

Wheel Sensor and Sensor Rotor

INFOID:0000000009365052

NOTE:

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

A

Parking brake switch
(view with console removed)

B

Combination meter

C

IPDM E/R

D

Brake fluid level switch
(view with IPDM E/R removed)

E

ABS actuator and electric unit (con-
trol unit)

F

Front wheel sensor

G

Stop lamp switch

H

Rear wheel sensor

No.

Component

Reference/Function

1

Parking brake switch

BRC-8, "Parking Brake Switch"

2

Combination meter

MWI-6, "METER SYSTEM : Combination Meter"

3

IPDM E/R

PCS-4, "Component Parts Location"

4

Brake fluid level switch

BRC-8, "Brake Fluid Level Switch"

5

ABS actuator and electric unit (con-
trol unit)

BRC-7, "ABS Actuator and Electric Unit (Control Unit)"

6

Front wheel speed sensor

BRC-7, "Wheel Sensor and Sensor Rotor"

7

Stop lamp switch

BRC-8, "Stop Lamp Switch"

8

Rear wheel speed sensor

BRC-7, "Wheel Sensor and Sensor Rotor"

BRC-8

< SYSTEM DESCRIPTION >

[ABS]

COMPONENT PARTS

• 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:0000000009365053

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

tric unit (control unit).

Brake Fluid Level Switch

INFOID:0000000009365056

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:0000000009365057

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

SYSTEM

BRC-9

< SYSTEM DESCRIPTION >

[ABS]

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SYSTEM

ABS
ABS : System Diagram

INFOID:0000000009365058

ABS : System Description

INFOID:0000000009365059

• 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 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.

VALVE OPERATION (ABS AND EBD FUNCTIONS)

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

calipers by operating each valve.

ALFIA0392GB

Component

Signal description

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

BRC-10

< SYSTEM DESCRIPTION >

[ABS]

SYSTEM

Brake Pedal Applied or ABS Function Operating (Pressure Increases)

Front RH brake caliper

• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the front RH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

Front LH brake caliper

• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the front LH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

Rear RH wheel cylinder

• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the rear RH wheel cylinder from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

Rear LH wheel cylinder

• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the rear LH wheel cylinder from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

JSFIA0679GB

Name

Not activated

During pressure increases

Cut valve 1

Power supply is not supplied (open)

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

Power supply is not supplied (open)

ABS OUT valve

Power supply is not supplied (close)

Power supply is not supplied (close)

Each brake caliper and each wheel cylinder 
(fluid pressure)

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Pressure increases