Subaru Legacy 2004 Service Manual page 3133

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 WHETHER A WHEEL TURNED FREELY OR
NOT.
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 the wheels are not in contact with road
surface.
2 CHECK TIRE SPECIFICATIONS.
Turn the ignition switch to OFF.
3 CHECK WEAR OF TIRE.
4 CHECK TIRE INFLATION PRESSURE.
5 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
6 CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check the ABS wheel speed sensor. <Ref.
to ABS-13, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
7 CHECK ABS WHEEL SPEED SENSOR OR
MAGNETIC ENCODER.
8 CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode. <Ref. to
VDC(diag)-23, PROCEDURE, Inspection
Mode.>
4) Read the DTC.
Check
Did the wheels turn freely?
Are the tire specifications cor-
rect?
Is the tire worn excessively?
Is the tire pressure correct?
Are the ABS wheel speed sen-
sor installation bolts tightened
to 7.5 N'm (0.76 kgf-m, 5.5 ft-
lb)? (For four wheels)
Is the oscilloscope pattern the
same waveform as shown in
the figure when the tire is
rotated? Is the pattern as
shown in the figure displayed
regularly in the oscilloscope
when the tire is slowly rotated
more than one revolution with
even speed?
Are there foreign materials,
breakage or damage in the
protrusion of ABS wheel speed
sensor or magnetic encoder?
Is the same DTC displayed?
VDC(diag)-60
Yes
VDC is normal. Go to step 2.
Erase the memory.
NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way, this diag-
nostic trouble code
may sometimes
occur.
Go to step 3. Replace the tire.
Replace the tire. Go to step 4.
Go to step 5. Adjust the tire
pressure.
Go to step 6. Tighten the ABS
wheel speed sen-
sor installation
bolts.
Go to step 8. Go to step 7.
Remove dirt thor- Go to step 8.
oughly. Replace
the ABS wheel
speed sensor or
magnetic encoder
as a unit with hub
unit bearing if
there is breakage
or damage.
Replace the Go to step 9.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
No