Nissan Sentra. Instruction — part 158
SYSTEM
BRC-19
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
ABS Function Operating (Pressure Increases)
Front RH brake caliper
• Brake fluid is supplied to the front RH brake caliper from the master cylinder through the cut valve 1 and the
ABS IN valve. Since the suction valve 1 and the ABS OUT valve is closed, the fluid does not flow into the
reservoir. The amount of brake fluid supplied to the front RH brake caliper from the master cylinder is con-
trolled according to time that the ABS IN valve is not energized (time that the ABS IN valve is open).
Front LH brake caliper
• Brake fluid is supplied to the front LH brake caliper from the master cylinder through the cut valve 2 and the
ABS IN valve. Since the suction valve 2 and the ABS OUT valve is closed, the fluid does not flow into the
reservoir. The amount of brake fluid supplied to the front LH brake caliper from the master cylinder is con-
trolled according to time that the ABS IN valve is not energized (time that the ABS IN valve is open).
Rear RH brake caliper/wheel cylinder
• Brake fluid is supplied to the rear RH brake caliper/wheel cylinder from the master cylinder through the cut
valve 2 and the ABS IN valve. Since the suction valve 2 and the ABS OUT valve is closed, the fluid does not
flow into the reservoir. The amount of brake fluid supplied to the rear RH brake caliper/wheel cylinder from
the master cylinder is controlled according to time that the ABS IN valve is not energized (time that the ABS
IN valve is open).
Rear LH brake caliper/wheel cylinder
ALFIA0335GB
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)
—
Pressure increases
BRC-20
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
• Brake fluid is supplied to the rear LH brake caliper/wheel cylinder from the master cylinder through the cut
valve 1 and the ABS IN valve. Since the suction valve 1 and the ABS OUT valve is closed, the fluid does not
flow into the reservoir. The amount of brake fluid supplied to the rear LH brake caliper/wheel cylinder from
the master cylinder is controlled according to time that the ABS IN valve is not energized (time that the ABS
IN valve is open).
Brake Release
Front RH brake caliper
• Brake fluid is supplied to the front RH brake caliper through the return check valve of the ABS IN valve and
the cut valve 1, and returns to the master cylinder.
Front LH brake caliper
• Brake fluid is supplied to the front LH brake caliper through the return check valve of the ABS IN valve and
the cut valve 2, and returns to the master cylinder.
Rear RH brake caliper/wheel cylinder
• Brake fluid is supplied to the rear RH brake caliper/wheel cylinder through the return check valve of the ABS
IN valve and the cut valve 2, and returns to the master cylinder.
Rear LH brake caliper/wheel cylinder
• Brake fluid is supplied to the rear LH brake caliper/wheel cylinder through the return check valve of the ABS
IN valve and the cut valve 1, and returns to the master cylinder.
ALFIA0338GB
Name
Not activated
During brake release
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)
—
Pressure decreases
SYSTEM
BRC-21
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Component Parts and Function
CONDITIONS FOR INDICATOR LAMP ILLUMINATION
• Turns ON when VDC and TCS functions are switched to non-operational status (OFF) by VDC OFF switch.
• Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
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).
Cut valve 1
Cut valve 2
Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2
Supplies the brake fluid from master cylinder to the pump.
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.
Pressure sensor
Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Condition (status)
VDC OFF indicator lamp
SLIP indicator 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
When VDC OFF switch is ON (VDC function
and TCS function are OFF)
ON
OFF
VDC function is malfunctioning
OFF
ON
TCS function is malfunctioning
OFF
ON
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
VDC function is malfunctioning
OFF
OFF
TCS function is malfunctioning
OFF
OFF
ABS function is malfunctioning
ON
OFF
EBD function is malfunctioning
ON
ON
BRC-22
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
VDC/TCS/ABS : VDC Function
INFOID:0000000009757818
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
• Side slip or tail slip may occur while driving on a slippery road or intending an urgent evasive driving maneu-
ver. VDC function detects side slip status using each sensor when side slip or tail slip is about to occur and
improves vehicle stability by brake control and engine output control during driving.
• In addition to ABS function, EBD function and TCS function, target side slip amount is calculated according
to steering operation amount from steering angle sensor. By comparing this information with vehicle side slip
amount that is calculated from information from yaw rate/side G sensor and wheel sensor, vehicle driving
conditions (conditions of understeer or oversteer) are judged and vehicle stability is improved by brake force
control on all 4 wheels and engine output control.
• VDC function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case,
VDC OFF indicator lamp turns ON.
• Control unit portion automatically improves driving stability by performing brake force control as well as
engine output control, by transmitting drive signal to actuator portion according to difference between target
side slip amount and vehicle side slip amount
Brake limited slip differential (BLSD) function
is malfunctioning
OFF
OFF
VDC function is operating
OFF
OFF
TCS function is operating
OFF
OFF
Condition (status)
ABS warning lamp
Brake warning lamp
AWFIA0807GB
JSFIA0672GB
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