Subaru Legacy 2002 Service Manual page 2578

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
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.
2 CHECK RUNNING FIELD.
Check if the vehicle was driven on banked
road surfaces or sandy surfaces (not dirt road
surfaces).
3 CHECK POWER SUPPLY OF STEERING
ANGLE 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:
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-17, REMOVE, VDCCM Connec-
tor 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:
5 CHECK POOR CONTACT IN CONNEC-
TORS.
6 CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure resistance between steering sensor
and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
7 CHECK HARNESS OF STEERING ANGLE
SENSOR.
1) Connect connector to steering angle sen-
sor.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
(F87) No. 81 — No. 83:
8 CHECK STEERING ANGLE SENSOR.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the diagnostic trouble code.
Step
Is the angle of steering
wheel within 5°?
Was the vehicle driven on
banked road surfaces or
sandy surfaces (not dirt
road surfaces)?
Is the voltage between 10
and 15 V?
Is the voltage between 10
and 15 V?
Is there poor contact in
yaw rate sensor connector?
Is the resistance less than
0.5 Ω?
Is the resistance 120±6 Ω? Repair harness
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
VDC-119
Check Yes
Go to step 2.
Driving on banked
road surfaces or
sandy surfaces
(not dirt road sur-
faces) sometimes
results in a
VDCCM memory
trouble code.
Go to step 6.
Repair harness
between yaw rate
sensor and
VDCCM.
Repair or replace
VDCCM connec-
tor.
Go to step 7.
between steering
angle sensor and
VDCCM.
Go to step 10.
VDC (Diagnostics)
No
Perform centering
alignment of
steering.
Go to step 3.
Go to step 4.
Go to step 5.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Repair steering
angle sensor
ground harness.
Go to step 8.
Go to step 9.