Subaru Legacy 2003 Service Manual page 3120

DIAGNOSTICS CHART WITH SELECT MONITOR
Step
1 CHECK IF THE WHEELS HAVE TURNED
FREELY.
Check if the wheels have been turned freely for
more than one minute, such as when the vehi-
cle is jacked-up, under full-lock cornering or
when tire is not in contact with road surface.
2 CHECK TIRE SPECIFICATIONS.
Are the tire specifications correct?
3 CHECK WEAR OF TIRE.
Is the tire worn excessively?
4 CHECK TIRE PRESSURE.
Is the tire pressure correct?
5 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
33 ± ± ± ± 10 N·m (3.3 ± ± ± ± 1.0 kgf-m, 24 ± ± ± ± 7 ft-lb)
Are the ABS sensor installation bolts tightened
securely?
6 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?
7 CHECK OSCILLOSCOPE.
Is an oscilloscope available?
8 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, REMOVE, 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
(F49) No. 14 (+) — No. 15 ( − − − − ) (Front RH):
(F49) No. 49 (+) — No. 19 ( − − − − ) (Front LH):
(F49) No. 18 (+) — No. 46 ( − − − − ) (Rear RH):
(F49) No. 16 (+) — No. 17 ( − − − − ) (Rear LH):
Is oscilloscope pattern smooth, as shown in
figure?
Value
Turned freely over 1 minutes.
Turned freely over 1 minutes.
Worn excesiblely.
Correct tire pressure.
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.
VDC-147
VDC (DIAGNOSTICS)
Yes
The VDC is nor- Go to step 2.
mal. Erase the
diagnostic trouble
code.
NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or under full-
lock cornering
locked in full, this
trouble code may
sometimes occur.
Go to step 3. Replace tire.
Replace tire. Go to step 4.
Go to step 5. Adjust tire pres-
sure.
Go to step 6. Tighten ABS sen-
sor installation
bolts securely.
Go to step 7. 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 8. Go to step 9.
Go to step 12. Go to step 9.
No
tone