ABS NISSAN ALMERA 2001 User Guide

System ComponentsNJBR0086
SBR758E
SBR124B
System DescriptionNJBR0087SENSORNJBR0087S01The 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.
SBR759E
CONTROL UNITNJBR0087S02The 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 UNITNJBR0087S03The ABS actuator and electric unit contains:
+An electric motor and pump
+Two relays
+Eight solenoid valves, each inlet and outlet for
Ð LH front
Ð RH front
Ð LH rear
Ð RH rear
+ABS control unit
DESCRIPTIONABS
System Components
BR-50

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 OperationNJBR0087S0301
Inlet solenoid
valveOutlet 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 operationPressure hold ON (Closed) OFF (Closed)Hydraulic circuit is shut off to hold the caliper brake
fluid pressure.
Pressure
decreaseON (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
increaseOFF (Open) OFF (Closed)Master cylinder brake fluid pressure is transmitted
to caliper.
DESCRIPTIONABS
System Description (Cont'd)
BR-51

Component Parts and Harness Connector
Location
NJBR0088
SBR765E
DESCRIPTIONABS
Component Parts and Harness Connector Location
BR-52

Schematic/SedanNJBR0089
HBR131
DESCRIPTIONABS
Schematic/Sedan
BR-53

Wiring Diagram Ð ABS Ð/SedanNJBR0090
HBR122
DESCRIPTIONABS
Wiring Diagram Ð ABS Ð/Sedan
BR-54

HBR132
DESCRIPTIONABS
Wiring Diagram Ð ABS Ð/Sedan (Cont'd)
BR-55

HBR103
DESCRIPTIONABS
Wiring Diagram Ð ABS Ð/Sedan (Cont'd)
BR-56

HBR123
DESCRIPTIONABS
Wiring Diagram Ð ABS Ð/Sedan (Cont'd)
BR-57

Schematic/HatchbackNJBR0137
NBR428
DESCRIPTIONABS
Schematic/Hatchback
BR-58

Wiring Diagram Ð ABS Ð/HatchbackNJBR0138MODELS WITH SELF-DIAGNOSIS FUNCTION (DATA
LINK CONNECTOR TERMINAL NO. 9)
NJBR0138S01
HBR106
DESCRIPTIONABS
Wiring Diagram Ð ABS Ð/Hatchback
BR-59