Subaru LEGACY 2003 Service Manual page 98

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
9 CHECK ABS SENSOR GAP.
Measure tone wheel to ABS sensor piece gap
over entire perimeter of the wheel.
Is the measured value within the specified
range?
10 PREPARE OSCILLOSCOPE.
Is an oscilloscope available?
11 CHECK ABS SENSOR SIGNAL.
1) Lift-up the vehicle.
2) Turn ignition switch to OFF.
3) Connect the oscilloscope to the connector.
4) Turn ignition switch to ON.
5) Rotate wheels and measure voltage at
specified frequency. <Ref. to ABS-15,
WAVEFORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the AB-
SCM&H/U sometimes stores the trouble code
29.
Connector & terminal
DTC 22 / LHD: (F45) No. 11 (+) — No. 12
( − − − − ):
RHD: (F2) No. 12 (+) — No. 13 ( − − − − ):
DTC 24/LHD: (F45) No. 8 (+) — No. 9 ( − − − − ):
RHD: (F2) No. 15 (+) — No. 16 ( − − − − ):
DTC 26 / (F55) No. 5 (+) — No. 6 ( − − − − ):
DTC 28 / (F55) No. 1 (+) — No. 4 ( − − − − ):
Is the measured value same with the speci-
fied value?
12 CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove disc rotor from hub in accordance
with diagnostic trouble code.
Is the ABS sensor piece or the tone wheel con-
taminated by mud or other foreign matter?
13 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
Are there broken or damaged in the ABS sen-
sor piece or the tone wheel?
Step Value
Front wheel 0.3 — 0.8 mm
(0.012 — 0.031 in) and Rear
wheel 0.44 — 0.94 mm
(0.0173 — 0.0370 in)
Available.
Oscilloscope pattern is as
shown in figure.
ABS sensor piece or the tone
wheel is not contaminated.
No broken or damaged.
ABS-96
Yes
Go to step 10. Adjust the gap.
NOTE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn
wheel.
Go to step 11. Go to step 12.
Go to step 15. Go to step 12.
Go to step 13. Thoroughly
remove dirt or
other foreign mat-
ter.
Go to step 14. Replace ABS sen-
sor or tone wheel.
Front: <Ref. to
ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
and Front: <Ref.
to ABS-19, Front
Tone Wheel.>
Rear: <Ref. to
ABS-20, Rear
Tone Wheel.>
No
tone