Nissan Silvia. Instruction — part 88
Purpose
NMBR0089
The Anti-Lock Brake System (ABS) consists of electronic and hydraulic components. It allows for control of
braking force so locking of the wheels can be avoided.
1) Improves proper tracking performance through steering wheel operation.
2) Eases obstacle avoidance through steering wheel operation.
3) Improves vehicle stability.
Operation
NMBR0090
I
When the vehicle speed is less than 10 km/h (6 MPH) this system does not work.
I
The Anti-Lock Brake System (ABS) has a self-test function. The system turns on the ABS warning lamp
for 1 second each time the ignition switch is turned “ON”. After the engine is started, the ABS warning lamp
turns off. The system performs a test the first time the vehicle reaches 6 km/h (4 MPH). A mechanical noise
may be heard as the ABS performs this self-test. This is a normal part of the self-test feature. If a mal-
function is found during this check, the ABS warning lamp will stay on.
I
While driving, a mechanical noise may be heard during ABS operation. This is a normal condition.
ABS Hydraulic Circuit
NMBR0091
SBR862C
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
DESCRIPTION
ABS
Purpose
BR-35
System Components
NMBR0092
SBR797E
SBR124B
System Description
NMBR0093
SENSOR
NMBR0093S01
The sensor unit consists of a gear-shaped sensor rotor and a sen-
sor element. The element contains a bar magnet around which a
coil is wound. The front sensors are installed on the front spindles
and the rear sensors are installed on the final drive. As the wheel
rotates, the sensor generates a sine-wave pattern. The frequency
and voltage increase(s) as the rotating speed increases.
SBR798E
JBR799E
CONTROL UNIT
NMBR0093S02
The control unit computes the wheel rotating speed by the signal
current sent from the sensor. Then it supplies a DC current to the
actuator solenoid valve. It also controls ON-OFF operation of the
solenoid valve relay and motor relay. If any electrical malfunction
should be detected in the system, the warning lamp is turned on.
In this condition, the ABS will be deactivated, and the vehicle’s
brake system reverts to normal operation.
DESCRIPTION
ABS
System Components
BR-36
JBR800E
ABS ACTUATOR
NMBR0093S03
The ABS actuator contains:
I
An electric motor and pump
I
Two relays
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Six solenoid valves, each inlet and outlet for
— LH front
— RH front
— Rear
This component controls the hydraulic circuit and increases, holds
or decreases hydraulic pressure to all or individual wheels. The
ABS actuator and electric unit is serviced as an assembly.
ABS Actuator Operation
NMBR0093S0301
Inlet solenoid
valve
Outlet solenoid
valve
Normal brake operation
OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is directly
transmitted to caliper via the inlet solenoid valve.
ABS operation
Pressure hold
ON (Closed)
OFF (Closed)
Hydraulic circuit is shut off to hold the caliper
brake fluid pressure.
Pressure
decrease
ON (Closed)
ON (Open)
Caliper brake fluid is sent to reservoir via the out-
let solenoid valve. Then it is pushed up to the
master cylinder by pump.
Pressure increase OFF (Open)
OFF (Closed)
Master cylinder brake fluid pressure is transmitted
to caliper.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
DESCRIPTION
ABS
System Description (Cont’d)
BR-37
Component Parts and Harness Connector
Location
NMBR0094
JBR801E
DESCRIPTION
ABS
Component Parts and Harness Connector Location
BR-38
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