Subaru Legacy 2003 - Page 59

VDC-57
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step Value Yes No
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?
Tightened securely. Go to step 2. Tighten ABS sen-
sor installation
bolts 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?
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)
Go to step 3. Adjust the gap.
N
O
TE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.
3 CHECK OSCILLOSCOPE.
Is an oscilloscope available?
Available. Go to step 4. Go to step 5.
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.>
N
O
TE:
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?
Smooth pattern. Go to step 8. Go to step 5.
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?
Dirt or foreign matter found. Thoroughly
remove dirt or
other foreign mat-
ter.
Go to step 6.
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?
Broken or damaged. Replace ABS sen-
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.>
Go to step 7.