Subaru IMPREZA 2002 Service Manual page 305

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
CHECK IF THE WHEELS HAVE TURNED
FREELY FOR A LONG TIME.
I
CHECK TIRE SPECIFICATIONS.
I
CHECK WEAR OF TIRE.
I CHECK TIRE PRESSURE.
Turn the ignition switch to OFF.
I
CHECK INSTALLATION
OF
ABS SENSOR.
Tightening torque:
32 N.m (3.3 kgf-m, 24 fl-lb)
i CHECK ABS SENSOR GAP.
Measure the tone wheel to ABS sensor piece
gap over entire perimeter of the wheel.
0.3
-
0.8 mm (0.012
-
0.031 in)
0.7
-
1.2 mm (0.028
-
0.047 in)
Front wheel
Rear wheel
?
PREPARE OSCILLOSCOPE.
Check
Check if the wheels have been
turned freely for more than one
minute, such as when the vehi-
cle is jacked-up, under full-lock
cornering or when tire is not in
contact with road surface.
Are the tire specifications cor-
rect?
I s
the tire worn excessively?
Is the tire pressure correct?
Are the ABS sensor installation
bolts tightened securely?
Is the gap within the specifica-
tions?
Is an oscilloscope available?
Yes
The ABS is nor-
mal. Erase the
diagnostic trouble
code.
NOTE:
When the wheels
tum freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way, this diag-
nostic trouble code
may sometimes
occur.
Go to step
3 .
Replace the tire.
Go to step 5.
Go to step
6.
Go to step 7.
Go to step 8.
No
30 to step 2.
Replace the tire.
Go to
step 4.
Adjust the tire
pressure.
Tighten the ABS
sensor installation
bolts securely.
Adjust the gap.
NOTE:
Adjust the gap us
ing spacer (Par
No. 26755AAOOO)
If spacers canno
correct the gap, re
place the
won
sensor or wori
tone wheel.
Go to step 9.
ABS-1 19