Nissan Qashqai J11. Manual - part 944

SYSTEM

BRC-13

< SYSTEM DESCRIPTION >

[WITH ESP]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

SYSTEM

System Description

INFOID:0000000010329788

• The system switches fluid pressure of each brake caliper 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 function, TCS function, ABS function, EBD function, brake limited slip differential (BLSD) function,
brake assist function, hill start assist function and Brake force distribution function.

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

occurs.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

ALFIA0419GB

Component

Signal description

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Accelerator pedal position signal
• Engine speed signal
• Engine torque signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication.
• Engine torque request signal

TCM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Current gear position signal

Chassis control module

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Active trace control signal

BRC-14

< SYSTEM DESCRIPTION >

[WITH ESP]

SYSTEM

VALVE OPERATION (ABS AND EBD)

Each valve is operated and fluid pressure of brake caliper is controlled.

When ordinary brake is applied and ABS is in operation (when pressure increases).

When front RH wheel caliper pressure increases

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication.
• Brake fluid level switch signal
• Parking brake switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication.
• Brake warning lamp signal
• ABS warning lamp signal
• VDC warning lamp signal
• VDC OFF indicator lamp signal

Steering angle sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication.
• Steering angle sensor signal
• Steering angle sensor malfunction signal

Component

Signal description

JPFIC0159GB

Name

Not activated

When 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)

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 caliper (fluid pressure)

—

Pressure increases

SYSTEM

BRC-15

< SYSTEM DESCRIPTION >

[WITH ESP]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, pressurized brake fluid is supplied to front RH caliper through ABS IN valve.

When front LH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, pressurized brake fluid is supplied to front LH wheel caliper through ABS IN valve.

When rear RH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, pressurized brake fluid is supplied to rear RH wheel caliper through ABS IN valve.

When rear LH wheel caliper pressure increases

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, pressurized brake fluid is supplied to rear LH wheel caliper through ABS IN valve.

When ABS operation starts (when pressure holds)

When front RH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

When front LH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

JPFIC0160GB

Name

Not activated

When pressure holds

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)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Power supply is not supplied (close)

Each caliper (fluid pressure)

—

Pressure holds

BRC-16

< SYSTEM DESCRIPTION >

[WITH ESP]

SYSTEM

When rear RH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the

same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

When rear LH wheel caliper pressure holds

• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At

the same time, because ABS IN valve and ABS OUT vale are closed, fluid pressure holds.

ABS is in operation (when pressure decreases)

When front RH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When front LH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When rear RH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

When rear LH wheel caliper pressure decreases

• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.

Component Parts and Function

JPFIC0161GB

Name

Not activated

When pressure decreases

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)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Power supply is supplied (open)

Each caliper (fluid pressure)

—

Pressure decreases