Subaru LEGACY 2003 Service Manual page 49

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK INSTALLATION OF ABS SENSOR.
Turn ignition switch to OFF.
Are the ABS sensor installation bolts tightened
with the specified torque?
2 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?
3 PREPARE OSCILLOSCOPE.
Is an oscilloscope available?
4 CHECK ABS SENSOR SIGNAL.
1) Lift-up the vehicle.
2) Turn ignition switch OFF.
3) Connect the oscilloscope to the connector.
4) Turn ignition switch 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 ABS
control module 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 as the speci-
fied value?
5 CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove disc rotor or drum from hub in accor-
dance with trouble code.
Is the ABS sensor piece or the tone wheel con-
taminated by mud or other foreign matter?
6 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
Are there broken or damaged in the ABS sen-
sor piece or the tone wheel?
Value
33±10 N·m (3.4±1.0 kgf-m,
25±7 ft-lb)
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 in
figure.
ABS sensor piece or the tone
wheel is not contaminated.
Not broken or damaged.
ABS-47
ABS (DIAGNOSTICS)
Yes
Go to step 2. Tighten ABS sen-
sor installation
bolts securely.
Go to step 3. 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 4. Go to step 5.
Go to step 8. Go to step 7.
Go to step 6. Thoroughly
remove mud or
other foreign mat-
ter.
Go to step 7. 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