Subaru LEGACY 2003 Service Manual page 117

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK THE STEERING WHEEL.
1) Drive the vehicle on a flat road.
2) Stop the vehicle in a straight line.
3) Check the angle of steering wheel.
Is the measured value less than the speci-
fied value?
2 CHECK RUNNING FIELD.
Check if the vehicle was driven on banked
road surfaces or sandy surfaces (not dirt road
surfaces).
Was the vehicle driven on banked road sur-
faces or sandy surfaces (not dirt road sur-
faces)?
3 CHECK POWER SUPPLY OF STEERING AN-
GLE SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from steering angle
sensor.
3) Turn ignition switch to ON.
4) Measure voltage between steering angle
sensor and chassis ground.
Connector & terminal
(B231) No. 4 ( + + + + ) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
4 CHECK OUTPUT VOLTAGE OF VDCCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM.
3) Remove cover for VDCCM connector.
<Ref. to VDC-19, REMOVE, VDCCM Con-
nector Cover.>
4) Connect connector to VDCCM.
5) Turn ignition switch to ON.
6) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 27 ( + + + + ) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
5 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in yaw rate sensor con-
nector?
6 CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure resistance between steering sensor
and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
Is the measured value less than the specified
value?
Value
5°
Driven
10 — 15 V
10 — 15 V
There is poor contact.
0.5 Ω
VDC-115
VDC (DIAGNOSTICS)
Yes
Go to step 2. Perform centering
alignment of steer-
ing.
Driving on banked Go to step 3.
road surfaces or
sandy surfaces
(not dirt road sur-
faces) sometimes
results in a
VDCCM memory
trouble code.
Go to step 6. Go to step 4.
Repair harness Go to step 5.
between yaw rate
sensor and
VDCCM.
Repair or replace Replace VDCCM.
VDCCM connec- <Ref. to VDC-8,
tor. VDC Control Mod-
ule (VDCCM).>
Go to step 7. Repair steering
angle sensor
ground harness.
No