Nissan Versa Sedan. Manual — part 105
SYSTEM
BRC-13
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VALVE OPERATION (VDC AND TCS FUNCTIONS)
The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-
ipers by operating each valve.
VDC and TCS Functions are Operating (Pressure Increases)
Component
Signal description
Steering angle sensor
Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
ECM
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM
Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.
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
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
JSFIA0670GB
Name
Not activated
Pressure increases
Cut valve 1
Power supply is not supplied (open)
Power supply is supplied (close)
Cut valve 2
Power supply is not supplied (open)
Power supply is supplied (close)
Suction valve 1
Power supply is not supplied (close)
Power supply is supplied (open)
Suction valve 2
Power supply is not supplied (close)
Power supply is supplied (open)
ABS IN valve
Power supply is not supplied (open)
Power supply is not supplied (open)
BRC-14
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
Front RH brake caliper
• Brake fluid is conveyed to the pump from the master cylinder through suction valve 1 and is pressurized by
the pump operation. The pressurized brake fluid is supplied to the front RH brake caliper through the ABS IN
valve. For the left caliper, brake fluid pressure is maintained because the pressurization is unnecessary. The
pressurization for the left caliper is controlled separately from the right caliper.
Front LH brake caliper
• Brake fluid is conveyed to the pump from the master cylinder through suction valve 2 and is pressurized by
the pump operation. The pressurized brake fluid is supplied to the front LH brake caliper through the ABS IN
valve. For the right caliper, brake fluid pressure is maintained because the pressurization is unnecessary.
The pressurization for the right caliper is controlled separately from the left caliper.
Rear RH wheel cylinder
• Brake fluid is conveyed to the pump from the master cylinder through suction valve 2 and is pressurized by
the pump operation. The pressurized brake fluid is supplied to the rear RH wheel cylinder through the ABS
IN valve. For the left wheel cylinder, brake fluid pressure is maintained because the pressurization is unnec-
essary. The pressurization for the left wheel cylinder is controlled separately from the right wheel cylinder.
Rear LH wheel cylinder
• Brake fluid is conveyed to the pump from the master cylinder through suction valve 1 and is pressurized by
the pump operation. The pressurized brake fluid is supplied to the rear LH wheel cylinder through the ABS
IN valve. For the right wheel cylinder, brake fluid pressure is maintained because the pressurization is
unnecessary. The pressurization for the right wheel cylinder is controlled separately from the left wheel cylin-
der.
VDC and TCS Functions Start Operating (Pressure Holds)
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
Name
Not activated
Pressure increases
JSFIA0677GB
SYSTEM
BRC-15
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Front RH brake caliper
• Since the cut valve 1 and the suction valve 1 are closed, the front RH brake caliper, master cylinder, and res-
ervoir are blocked. This maintains fluid pressure applied on the front RH brake caliper. The pressurization for
the left caliper is controlled separately from the right caliper.
Front LH brake caliper
• Since the cut valve 2 and the suction valve 2 are closed, the front LH brake caliper, master cylinder, and res-
ervoir are blocked. This maintains fluid pressure applied on the front LH brake caliper. The pressurization for
the right caliper is controlled separately from the left caliper.
Rear RH wheel cylinder
• Since the cut valve 2 and the suction valve 2 are closed, the rear RH wheel cylinder, master cylinder, and
reservoir are blocked. This maintains fluid pressure applied on the rear RH wheel cylinder. The pressuriza-
tion for the left wheel cylinder is controlled separately from the right wheel cylinder.
Rear LH wheel cylinder
• Since the cut valve 1 and the suction valve 1 are closed, the rear LH wheel cylinder, master cylinder, and
reservoir are blocked. This maintains fluid pressure applied on the rear LH wheel cylinder. The pressuriza-
tion for the right wheel cylinder is controlled separately from the left wheel cylinder.
VDC and TCS Functions Operating (Pressure Decreases)
Name
Not activated
Pressure holds
Cut valve 1
Power supply is not supplied (open)
Power supply is supplied (close)
Cut valve 2
Power supply is not supplied (open)
Power supply is supplied (close)
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 wheel cylinder (fluid
pressure)
—
Pressure holds
JSFIA0678GB
BRC-16
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
Front RH brake caliper
• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are
open, the fluid pressure applied on the front RH brake caliper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valve 1. The pressurization for the right caliper is con-
trolled separately from the left caliper.
Front LH brake caliper
• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are
open, the fluid pressure applied on the front LH brake caliper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valve 2. The pressurization for the left caliper is con-
trolled separately from the right caliper.
Rear RH wheel cylinder
• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are
open, the fluid pressure applied on the rear RH wheel cylinder is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valve 2. The pressurization for the right wheel cylinder
is controlled separately from the left wheel cylinder.
Rear LH wheel cylinder
• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are
open, the fluid pressure applied on the rear LH wheel cylinder is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valve 1. The pressurization for the left wheel cylinder is
controlled separately from the right wheel cylinder.
Component Parts and Function
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.
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 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
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).
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