Subaru Legacy 2002 Service Manual page 2519

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (Diagnostics)
No.
1 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32±10 N·m (3.3±1.0 kgf-m, 24±7 ft-lb)
2 CHECK ABS SENSOR GAP.
Measure tone wheel to pole piece gap over
entire perimeter of the wheel.
Specifications
Front wheel
0.3 — 0.8 mm (0.012 — 0.031 in)
Rear wheel
0.44 — 0.94 mm (0.0173 — 0.0370 in)
3 CHECK OSCILLOSCOPE.
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-17, 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 (−):
5 CHECK CONTAMINATION OF ABS SEN-
SOR OR TONE WHEEL.
Remove disc rotor or drum from hub in accor-
dance with diagnostic trouble code.
6 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
7 CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Step
Are the ABS sensor instal-
lation bolts tightened
securely?
Is the gap within the speci-
fications?
Is an oscilloscope avail-
able?
Is oscilloscope pattern
smooth, as shown in fig-
ure?
Is the ABS sensor pole
piece or the tone wheel
contaminated by dirt or
other foreign matter?
Are there broken or dam-
aged in the ABS sensor
pole piece or the tone
wheel?
Is the runout less than 0.05
mm (0.0020 in)?
VDC-60
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 8.
Thoroughly
remove dirt or
other foreign mat-
ter.
Replace ABS sen-
sor or tone wheel.
Front <Ref. to
VDC-28, Front
ABS Sensor.> and
<Ref. to VDC-30,
Front Tone
Wheel.> Rear
<Ref. to VDC-29,
Rear ABS Sen-
sor.> and <Ref. to
VDC-31, Rear
Tone Wheel.>
Go to step 8.
No
Tighten ABS sen-
sor installation
bolts securely.
Adjust the gap.
NOTE:
Adjust the gap
using spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap,
replace worn sen-
sor or worn tone
wheel.
Go to step 5.
Go to step 5.
Go to step 6.
Go to step 7.
Repair tone
wheel. Front <Ref.
to VDC-30, Front
Tone Wheel.>
Rear <Ref. to
VDC-31, Rear
Tone Wheel.>