Subaru Legacy (2005 year). Service manual — part 809
VDC(diag)-101
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)-102
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 HAR-
NESS.
1) Disconnect the connector from VDCCM&H/
U.
2) Measure the resistance between
VDCCM&H/U and steering angle sensor.
Connector & terminal
(B231) No. 1 — (B310) No. 29:
(B231) No. 2 — (B310) No. 13:
Is the resistance less than 0.5
Ω?
Repair the har-
ness between
steering angle
sensor and
VDCCM&H/U.
6
CHECK GROUND SHORT CIRCUIT OF
STEERING ANGLE SENSOR HARNESS.
Measure the resistance between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 1 — Chassis ground:
(B231) No. 2 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the har-
ness between
steering angle
sensor and
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?
8
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).>
VDC(diag)-103
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AW:DTC C0071 STEERING ANGLE SENSOR POWER SUPPLY MALFUNCTION
DTC DETECTING CONDITION:
Defective steering angle sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
NOTE:
• Warning light does not illuminate though problem is detected.
• The ABS and VDC operate normally if voltage returns.
9
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).>
10
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Temporary poor
contact occurs.
11
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Original steering
angle sensor mal-
function
Step
Check
Yes
No
VDC(diag)-104
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
• LHD model
VDC00327
30
29
13
B231
B234
E
2
4
1
3
3
1
4
2
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
B234
3 4
5 6
1 2
7 8
B352
3
1
4
2
B352
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