SERVICE BRAKES
Anti-lock Braking System Troubleshooting
Check flow connected with wheel speed
sensor
NOTE:
When checking with an oscilloscope. first measure voltage
variations in the wheel speed sensor output. (Refer to
Is the resistance value of the wheel speed
sensor part, which the displayed diagnos-
Malfunction of wheel speed
R e p l a c e w h e e l s p e e d
sensor
sensor.
tic trouble code indicates, normal?
Standard value:
Yes
I s t h e
connector normal?
speed sensor
Repair harness.
Standard value:
1.2
broken.
Yes
the standard value for the
g a p b e t w e e n t h e w h e e l
speed sensor and rotor,
which the output diagnostic
trouble
code
indicates,
within the range?
m m
.
Yes
Yes
Check the output of each
wheel speed sensor with an
oscilloscope, including the
wave form. (Refer to mea-
surement of wheel speed
sensor output voltage varia-
tions on
Is the out-
put voltage for each wheel
speed sensor over the stand-
ard value and is the wave
form normal?
Yes
No
R e c h e c k i f b e l o w t h e
standard value or if the
sensor has a poor wave
form. Replace sensor or
rotor.
C a n t h e a b n o r m a l i t y b e
found even if the sensor
harness and connection be-
tween sensor harness and
body harness are bent and
stretched?
All the above checks are
normal. There is a
tion of ABS ECU when this
d i a g n o s t i c t r o u b l e c o d e
reoccurs often.
R e p l a c e t h e
and check that the
trouble code does
not reoccur.
TSB Revision
Summary of Contents for 1989 Galant
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