Subaru Legacy 2004 Service Manual page 3172

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.
2 CHECK DRIVING PLACE.
Check if the vehicle ran the road with banks or
sandy surface (which does not mean a dirt
road).
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.
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.
5 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the deviation from the center
of steering wheel less than 5"?
Did the vehicle run the road
with banks or sandy surface
(which does not mean a dirt
road)?
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?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-99
Yes
Go to step 2. Perform the cen-
tering adjustment
of steering wheel.
VDCCM&H/U may Go to step 3.
record DTC when
the vehicle ran the
road with banks or
sandy surface
(which does not
mean a dirt road).
Go to step 4. Replace the steer-
ing angle sensor.
Replace the Go to step 5.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC.
No