Subaru Legacy 2003 Service Manual page 3030

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32 ± ± ± ± 10 N·m (3.3 ± ± ± ± 1.0 kgf-m, 24 ± ± ± ± 7 ft-lb)
Are the ABS sensor installation bolts tightened
securely?
2 CHECK ABS SENSOR GAP.
Measure tone wheel to pole piece gap over
entire perimeter of the wheel.
Is the measured value within the specified
range?
3 CHECK OSCILLOSCOPE.
Is an oscilloscope available?
4 CHECK ABS SENSOR SIGNAL.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Remove VDCCM connector cover. <Ref. to
VDC-19, VDCCM Connector Cover.>
4) Connect the oscilloscope to the connector.
5) Turn ignition switch ON.
6) 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 VDCCM
sometimes stores the DTC 29.
Connector & terminal
DTC 22 / (F87) No. 14 (+) — No. 15 ( − − − − ):
DTC 24 / (F87) No. 49 (+) — No. 19 ( − − − − ):
DTC 26 / (F87) No. 18 (+) — No. 46 ( − − − − ):
DTC 28 / (F87) No. 16 (+) — No. 17 ( − − − − ):
Is oscilloscope pattern smooth, as shown in
figure?
5 CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove disc rotor from hub in accordance
with diagnostic trouble code.
Is the ABS sensor pole piece or the tone wheel
contaminated by dirt or other foreign matter?
6 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
Are there broken or damaged in the ABS sen-
sor pole piece or the tone wheel?
Value
Tightened securely.
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.
Smooth pattern.
Dirt or foreign matter found.
Broken or damaged.
VDC-57
VDC (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 5.
Thoroughly Go to step 6.
remove dirt or
other foreign mat-
ter.
Replace ABS sen- Go to step 7.
sor or tone wheel.
Front <Ref. to
VDC-27, Front
ABS Sensor.> and
<Ref. to VDC-29,
Front Tone
Wheel.> Rear
<Ref. to VDC-28,
Rear ABS Sen-
sor.> and <Ref. to
VDC-30, Rear
Tone Wheel.>
No
tone