Suzuki Grand Vitara 1998, Service Manual

Page: 347 / 801

YH4
GRAND
VITARA
1. Diagnosis connector
(6 pins connector)
2. Ground terminal
3. Diag. switch terminal
4. Service wire
5E1-6 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
ABS HYDRAULIC UNIT/CONTROL MODULE
ASSEMBLY
ABS control module is a component of ABS hydrauli unit / control
module assembly and has the following functions.
Self-Diagnosis Function
ABS control module diagnoses conditions of the system compo-
nent 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 below.
1) When ignition switch is turned ON, “ABS” warning lamp lights for
2 seconds to check its bulb and circuit.
2) When no abnormality has been detected (the system is in good
condition), “ABS” warning lamp turns OFF after 2 seconds.
3) When the vehicle starts to move after the ignition switch is turned
ON (more than one wheel speed sensor signals are inputted),
solenoid valves and motor of ABS hydraulic unit operate once
one after another for electrical check.
During this check, motor operation sound may be heard but that
means nothing abnormal.
4) 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.
5) When Diag. switch terminal of diagnosis connector (monitor
connector) is grounded, the abnormal area is output as DTC. It
is indicated by flashing of “ABS” warning lamp. (Refer to the
table below. )
ABS WARNING LAMP
SYSTEM CONDITION
Diag. switch
terminal is not
grounded
Diag. switch
terminal is
grounded
In good condi-
No trouble in
the past
OFF DTC 12
g
tion at present
Trouble occur-
red in the past
OFF History DTC
Abnormality
exists at
No trouble in
the past
ON Current DTC
exists at
present
Trouble occur-
red in the past
ON
Current and
history DTCs
For procedure to clear all DTC’s, refer to the item “Diagnostic
Trouble Code Clearance” in this section.
Also ABS control module turns ON EBD warning lamp (brake warn-
ing lamp) depending on the trouble that detected by the module and
EBD warning lamp does not indicate DTC as well as “ABS” warning
lamp.
Fail-Safe Function
When an abnormality occurs (an abnormal DTC is detected), ABS
control module turns OFF the fail-safe relay which supplies power
to ABS hydraulic unit. Thus, with ABS not operating, brakes func-
tion just like the brake system of the vehicle not equipped with ABS.