SERVICE BRAKES
Anti-lock Braking
System Troubleshooting
No.
4
Trouble condition
After the ignition key is turned to the
“ON” position, it blinks once and then
illuminates when it is turned to the
“START” position. When the key is
returned to the “ON” position, the light
blinks again. (Blinking with the ignition
key in the “ON” position is synchronized
with operation noise of the valve relay.)
ight
gnition
ACC.
Major causes
l
Break in harness for ECU warning
light drive circuit
l
Malfunction of ECU
CONTINUED FROM PREVIOUS PAGE
Does the ABS warning light illuminate
Yes
Trouble with the motor
when starting to drive the car?
lay, solenoid valve [due to
self test when driving above
6 km/h (4
or malfunc-
No
tion of wheel speed sensor
Is there one-sided braking, insufficient
No
braking force or malfunction of ABS
operation?
I
Y e s
Trouble condition
One-sided braking
Insufficient braking force
Decline in ABS function
Major causes
l
Mechanical lock of HU solenoid valve
l
Hydraulic line in HU is clogged.
l
Malfunction in HU solenoid valve
(Wheels easily lock when there is
eration
den braking.)
l
Hydraulic line in HU is clogged.
ABS sometimes functions even when
l
Insufficient wheel speed sensor
there is no sudden braking. (ABS
put voltage (sensor malfunction,
tion vibration is transmitted.)
large a gap between sensor rotor or
missing rotor teeth or temporarily
broken wire in sensor harness)
l
Malfunction of ABS ECU
Remedy
Check, using flow
chart D. (Refer to
Remedy
Check HU operation (Refer to
and, if necessary,
replace HU.
If HU is normal, check
structural parts for normal
braking. (Refer to
Check wheel speed sensor
(Refer to
and, if
necessary.
replace sensor,
adjust gap or replace rotor.
If tests indicate that there are
no mechanical or electrical
failures, replace the ECU.
TSB Revision
Summary of Contents for 1989 Galant
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