Subaru Legacy (2005 year). Manual — part 810
VDC(diag)-105
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
• RHD model
VDC00247
30
29
13
B231
E
2
4
1
3
B310
B310
VDCCM & H/U
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
1 2 3 4
B231
TWISTED WIRE
STEERING
ANGLE SENSOR
VDC(diag)-106
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK POWER SUPPLY FOR STEERING
ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from steering
angle sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 4 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
2
CHECK OUTPUT VOLTAGE OF VDCCM&H/
U.
Measure the voltage between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 30 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
Repair the har-
ness between
steering angle
sensor and
VDCCM&H/U.
3
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector?
Correct or replace
the connector.
4
CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure the resistance between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
Is the resistance less than 0.5
Ω?
Repair ground cir-
cuit in the steering
angle sensor.
5
CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Perform the clear memory mode.
4) Perform the inspection mode.
5) Read the DTC.
Is the same DTC displayed?
6
CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the steering angle sensor.
3) Perform the clear memory mode.
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 and Hydraulic
Control Unit
(VDCCM&H/U).>
7
CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Perform the clear memory mode.
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 and Hydraulic
Control Unit
(VDCCM&H/U).>
8
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Temporary poor
contact occurs.
9
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Original steering
angle sensor mal-
function
VDC(diag)-107
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AX:DTC C0072 YAW RATE SENSOR OUTPUT
DTC DETECTING CONDITION:
Defective yaw rate sensor
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
VDC00222
28
2
1
30
3
16
6
B312
B347
4
2
1
3
5
6
B230
1
B230
B310
VDCCM & H/U
1
3
4 5 6
2
B312
1 2
B310
E
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
YAW RATE &
LATERAL G SENSOR
VDC(diag)-108
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
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).
2
CHECK YAW RATE & LATERAL G SENSOR
INSTALLATION.
Is the yaw rate & lateral G sen-
sor installation bolt tightened to
7.5 N
⋅m (0.76 kgf-m, 5.5 ft-lb)?
Tighten the yaw
rate & lateral G
sensor installation
bolt.
3
CHECK OUTPUT OF YAW RATE & LATER-
AL G SENSOR WITH SUBARU SELECT
MONITOR.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Select {Current Data Display & Save} in
Subaru Select Monitor.
4) Read the yaw rate output displayed on dis-
play.
Is the reading indicated on
monitor display
−4 — 4 deg/s?
Replace the yaw
rate & lateral G
sensor.
4
CHECK OUTPUT OF STEERING ANGLE
SENSOR WITH SUBARU SELECT MONI-
TOR.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Select {Current Data Display & Save} in
Subaru Select Monitor.
4) Read the steering angle sensor output dis-
played on display.
Is the reading indicated on
monitor display
−5 — 5°?
Perform the cen-
tering adjustment
of steering wheel.
5
CHECK YAW RATE & LATERAL G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Perform the clear memory mode.
4) Perform the inspection mode.
5) Read the DTC.
Is the same DTC displayed?
6
CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the yaw rate & lateral G sensor.
3) Perform the clear memory mode.
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 and Hydraulic
Control Unit
(VDCCM&H/U).>
7
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Temporary poor
contact occurs.
8
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Malfunction is
found in original
yaw rate & lateral
G sensor.
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