Subaru IMPREZA 2002 Service Manual page 235

m
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
CHECK INSTALLATION OF ABS SENSOR.
Turn the ignition switch to OFF.
32 N.m (3.3 kgf-m, 24 ft-lb)
Tightening torque:
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)
Front wheel
Check
Are the ABS sensor installation
bolts tightened securely?
Is the gap within the specifica-
tions?
I
PREPARE OSCILLOSCOPE.
I
CHECK ABS SENSOR SIGNAL.
1)Raise all four wheels off ground.
2)Turn the ignition switch OFF.
3)Connect the oscilloscope to the connector.
4)Turn the ignition switch
ON.
5)Rotate the wheels and measure voltage at
specified frequency. <Ref. to ABS-1 7, WAVE-
FORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the ABS
control module sometimes stores the DTC 29.
Connector & terminal
DTC 22 /
DTC 24 /
DTC26/
DTC28/
(F95) NO. 1 (+)
-
NO. 2 (-):
(F94) NO. 1 (+)
-
NO.
2 (-):
(699) NO. 9 (+)
-
NO.
10 (-):
(699) NO. 4 (+)
-
NO. 5 (-):
CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove the disc rotor or drum from hub in
accordance with diagnostic trouble code.
CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
i
Is an oscilloscope available?
Is the oscilloscope pattern
smooth, as shown in the fig-
ure?
Is the ABS sensor piece or the
tone wheel contaminated by
dirt or other foreign matter?
Are there broken or damaged
in the ABS sensor piece or the
tone wheel?
Yes
30 to step 2.
30 to step 3.
30
to step 4.
30 to step 8.
rhoroughly
'emove dirt or
ither foreign mat-
e r.
3eplace the ABS
sensor or tone
Nheel. Front: <Ref.
:o ABS-14, Front
4BS Sensor.>
3ear: <Ref. to
46s-18, Rear
4BS Sensor.> and
Front: <Ref. to
46s-21, Front
Tone Wheel.>
?ear: <Ref. to
465-22, Rear
Tone Wheel.>
No
7ghten the ABS
iensor installation
lolts securely.
idjust the gap.
JOTE:
idjust the gap us
'lg spacer (Par
do. 26755AA000)
f spacers canno
:orrect the gap, re
)lace worn senso
)r worn tonc
vheel.
io to step 5.
20
to step 7.
io to step 6.
30 to step 7.
ABS-49