Nissan Note E12. Manual — part 80
SYSTEM
BRC-11
< SYSTEM DESCRIPTION >
[ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
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)
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 supplied (close)
ABS OUT valve
Power supply is not supplied (close)
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)
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 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]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
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
OFF
For approx. 1 second after the ignition switch
is turned ON
ON
ON
Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration)
OFF
OFF
After engine starts
OFF
OFF
When parking brake operates (parking brake
switch ON)
OFF
ON
When brake fluid is less than the specified
level (brake fluid level switch ON)
OFF
ON
ABS function is malfunctioning
ON
OFF
EBD function is malfunctioning
ON
ON
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
.
INPUT SIGNAL AND OUTPUT SIGNAL
AWFIA0808GB
JPFIC0140GB
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