Mitsubishi 1989-1993 GALANT Service Manual page 1156

SERVICE BRAKES
No. 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
4
blinks again. (Blinking with the ignition
key in the "ON" position is synchronized
with operation noise of the valve relay.)
varning
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Does the ABS warning light illuminate
when starting to drive the car?
No
Is there one-sided braking, insufficient
braking force or malfunction of ABS
operation?
Yes
Trouble condition
One-sided braking
Insufficient braking force
Decline in ABS function
(Wheels easily lock when there is sud-
den braking.)
ABS sometimes functions even when
there is no sudden braking. (ABS opera-
tion vibration is transmitted.)
l Break in harness for ECU warning
light drive circuit
l Malfunction of ECU
Yes
Trouble with the motor re-
lay, solenoid valve [due to
self test when driving above
6 km/h (4 mph)] or malfunc-
tion of wheel speed sensor
No
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Major causes
Mechanical lock of HU solenoid valve
l
Hydraulic line in HU is clogged.
l
Malfunction in HU solenoid valve op-
l
eration
Hydraulic line in HU is clogged.
l
l Insufficient wheel speed sensor out-
put voltage (sensor malfunction, too
large a gap between sensor rotor or
missing rotor teeth or temporarily
broken wire in sensor harness)
TSB Revision
Major causes
Check HU operation (Refer to
replace HU.
If HU
structural parts for normal
braking. (Refer to P.35-12.)
Check wheel speed sensor
(Refer to P.35-126.) and, if
necessary,
adjust gap or replace rotor.
If tests indicate that there are
no mechanical or electrical
failures, replace the ECU.
Remedy
Check, using flow
chart D. (Refer to
Remedy
is normal, check
replace sensor,