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Nissan Note E12. Manual - part 80

SYSTEM

BRC-11

< SYSTEM DESCRIPTION >

[ABS]

BRC

ABS Function Starts Operating (Pressure Holds)

Front RH brake caliper

• Since the ABS IN valve and the ABS OUT valve are closed, the front RH brake caliper, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the front RH brake caliper.

Front LH brake caliper

• Since the ABS IN valve and the ABS OUT valve are closed, the front LH brake caliper, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the front LH brake caliper.

Rear RH wheel cylinder

• Since the ABS IN valve and the ABS OUT valve are closed, the rear RH wheel cylinder, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the rear RH wheel cylinder.

Rear LH wheel cylinder

• Since the ABS IN valve and the ABS OUT valve are closed, the rear LH wheel cylinder, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the rear LH wheel cylinder.

JSFIA0680GB

Name

Not activated

During pressure holds

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Each brake caliper and each wheel cylinder
(fluid pressure)

—

Pressure holds

BRC-12

< SYSTEM DESCRIPTION >

[ABS]

SYSTEM

ABS Function Operating (Pressure Decreases)

Front RH brake caliper

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the front RH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the master cylinder by the pump.

Front LH brake caliper

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the front LH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the master cylinder by the pump.

Rear RH wheel cylinder

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear RH

wheel cylinder is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the master cylinder by the pump.

Rear LH wheel cylinder

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear LH

wheel cylinder is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the master cylinder by the pump.

Component Parts and Function

JSFIA0681GB

Name

Not activated

During pressure decreases

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

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 brake caliper and each wheel cylinder
(fluid pressure)

—

Pressure decreases

SYSTEM

BRC-13

< SYSTEM DESCRIPTION >

[ABS]

BRC

CONDITIONS FOR WARNING LAMP ILLUMINATION

Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.

Component

Function

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).

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 decreas-
es when decreasing pressure of brake caliper and wheel cylinder.

Condition (status)

ABS warning lamp

Brake warning lamp

Ignition switch OFF

OFF

For approx. 1 second after the ignition switch
is turned ON

Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration)

OFF

After engine starts

OFF

When parking brake operates (parking brake
switch ON)

OFF

When brake fluid is less than the specified
level (brake fluid level switch ON)

OFF

ABS function is malfunctioning

OFF

EBD function is malfunctioning

BRC-14

< SYSTEM DESCRIPTION >

[ABS]

SYSTEM

ABS : ABS Function

INFOID:0000000009365062

SYSTEM DIAGRAM

• By preventing wheel lock through brake force (brake fluid pressure) control that is electronically controlled by

detecting wheel speed during braking, stability during emergency braking is improved so that obstacles can

be easily bypassed by steering operation.

• During braking, control units calculate wheel speed and pseudo-vehicle speed, and transmit pressure

increase, hold or decrease signals to actuator portion according to wheel slip status.

• The following effects are obtained by preventing wheel lock during

braking.

- Vehicle tail slip is prevented during braking when driving straight.

- Understeer and oversteer tendencies are moderated during brak-

ing while cornering.

- Obstacles may be easily bypassed by steering operation during

braking.

• CONSULT can be used to diagnose the system.

• Fail-safe function is adopted. When a malfunction occurs in ABS

function, the control is suspended for ABS function. However, EBD

function operates normally. Refer to

BRC-16, "ABS : Fail-safe"

INPUT SIGNAL AND OUTPUT SIGNAL

AWFIA0808GB

JPFIC0140GB

Content .. 78 79 80 81 ..