Suzuki Liana RH413, Service Manual

Page: 504 / 1302

4E-2 ABS:
General Description
ABS Construction
S3RH0A4501001
The ABS (Antilock Brake System) controls the fluid
pressure applied to the wheel cylinder of each brake
from the master cylinder so that each wheel is not locked
even when hard braking is applied.
This ABS has also the following function.
While braking is applied, but before ABS control
becomes effective, braking force is distributed between
the front and rear so as to prevent the rear wheels from
being locked too early for better stability of the vehicle.
The main component parts of this ABS include the
following parts in addition to those of the conventional
brake system.
• Wheel speed sensor which senses revolution speed
of each wheel and outputs its signal.
• ABS warning lamp which lights to inform abnormality
when system fails to operate properly.
• ABS hydraulic unit / control module assembly is
incorporated ABS control module, ABS hydraulic unit
(actuator assembly), fail-safe relay (transistor), pump
motor relay (transistor) and G sensor (for 4WD model
only).
– ABS control module which sends operation signal
to ABS hydraulic unit to control fluid pressure
applied to each wheel cylinder based on signal
from each wheel speed sensor so as to prevent
wheel from locking.
– ABS hydraulic unit which operates according to
signal from ABS control module to control fluid
pressure applied to wheel cylinder of each 4
wheels.
– Fail-safe relay (transistor) which supplies power to
solenoid valve in ABS hydraulic unit.
– Pump motor relay (transistor) which supplies power
to pump motor in ABS hydraulic unit.
– G sensor which detects vehicle deceleration speed
in ABS hydraulic unit. (for 4WD model only)
This ABS is equipped with Electronic Brake force
Distribution (EBD) system that controls a fluid pressure
of rear wheels to best condition, which is the same
function as that of proportioning valve, by the signal from
wheel sensor independently of change of load due to
load capacity and so on. And if the EBD system fails to
operate properly, the brake warning lamp lights to inform
abnormality.
ABS Hydraulic Unit / Control Module Assembly
Description
S3RH0A4501002
ABS control module is a component of ABS hydraulic
unit / control module assembly and has the following
functions.
Self-Diagnosis Function
ABS control module diagnoses conditions of the system
component parts (whether or not there is any
abnormality) all the time and indicates the results
(warning of abnormality occurrence and DTC) through
the ABS warning lamp as described.
• When ignition switch is turned ON, ABS warning lamp
lights for 2 seconds to check its circuit.
• When no abnormality has been detected (the system
is in good condition), ABS warning lamp turns OFF
after 2 seconds.
• When an abnormality in the system is detected, ABS
warning lamp lights and the area where that
abnormality lies is stored in the memory of EEPROM
in ABS control module.
I3RH0A450008-01