Infiniti G20 (P11). Manual — part 115
System Components
NCBR0086
SBR470E
SBR124B
System Description
NCBR0087
SENSOR
NCBR0087S01
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 sensor is installed on the back side of the brake
rotor. Sine-wave current is generated by the sensor as the wheel
rotates. The frequency and voltage increase(s) as the rotating
speed increases.
SBR860E
CONTROL UNIT
NCBR0087S02
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
valve relay and motor relay. If any electrical malfunction should be
detected in the system, the control unit causes the warning lamp
to light up. In this condition, the ABS will be deactivated by the
control unit, and the vehicle’s brake system reverts to normal
operation.
SBR176E
ABS ACTUATOR AND ELECTRIC UNIT
NCBR0087S03
The ABS actuator and electric unit contains:
I
An electric motor and pump
I
Two relays
I
Eight solenoid valves, each inlet and outlet for
— LH front
— RH front
— LH rear
— RH rear
I
ABS control unit
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
ST
RS
BT
HA
SC
EL
IDX
DESCRIPTION
ABS
System Components
BR-35
This components controls the hydraulic circuit and increases, holds
or decreases hydraulic pressure to all or individual wheels. The
ABS actuator and electric unit are not disassemble.
ABS Actuator Operation
NCBR0087S0301
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 outlet
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.
DESCRIPTION
ABS
System Description (Cont’d)
BR-36
Component Parts and Harness Connector
Location
NCBR0088
SBR475E
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
ST
RS
BT
HA
SC
EL
IDX
DESCRIPTION
ABS
Component Parts and Harness Connector Location
BR-37
Schematic
NCBR0089
TBR182
DESCRIPTION
ABS
Schematic
BR-38
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