Subaru 2004 LEGACY, Service Manual

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VDC(diag)-99
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK STEERING WHEEL.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Check the steering wheel for deviation from
center. Is the deviation from the center
of steering wheel less than 5
°
?
Go to step 2. Perform the cen-
tering adjustment
of steering wheel.
2 CHECK DRIVING PLACE.
Check if the vehicle ran the road with banks or
sandy surface (which does not mean a dirt
road). Did the vehicle run the road
with banks or sandy surface
(which does not mean a dirt
road)? VDCCM&H/U may
record DTC when
the vehicle ran the
road with banks or
sandy surface
(which does not
mean a dirt road). Go to step 3.
3 CHECK OUTPUT OF STEERING ANGLE
SENSOR WITH SUBARU SELECT MONI-
TOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the steering angle sensor output dis-
played on display. Does the steering angle sensor
output value on the display
vary in accordance with steer-
ing operation when turning the
steering wheel to the right or
left? Go to step 4. Replace the steer-
ing angle sensor.
4 CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Erase the memory.
4) Perform the inspection mode.
5) Read the DTC. Is the same DTC displayed? Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).> Go to step 5.
5 CHECK OTHER DTC DETECTION. Is any other DTC displayed? Perform the diag-
nosis according to
DTC. Temporary poor
contact occurs.