Subaru Legacy (2005 year). Service manual — part 811

VDC(diag)-109

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AY:DTC C0072 YAW RATE SENSOR POWER/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)-110

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK YAW RATE & LATERAL G SENSOR
POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from yaw rate &
lateral G sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between yaw rate &
lateral G sensor and chassis ground.

Connector & terminal

(B230) No. 3 (+) — Chassis ground (

−

):

Is the voltage 10 — 15 V?

Go to step 4.

Go to step 2.

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 yaw
rate & lateral G
sensor and
VDCCM&H/U.

Go to step 3.

3

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-

nector?

Correct or replace
the connector.

Go to step 10.

4

CHECK GROUND CIRCUIT OF YAW RATE &
LATERAL G SENSOR.
Measure the resistance between yaw rate &
lateral G sensor and chassis ground.

Connector & terminal

(B230) No. 6 — Chassis ground:

Is the resistance less than 0.5
Ω?

Go to step 7.

Go to step 5.

5

CHECK GROUND CIRCUIT OF VDCCM&H/U.
Measure the resistance between VDCCM&H/U
and chassis ground.

Connector & terminal

(B310) No. 16 — Chassis ground:

Is the resistance less than 0.5
Ω?

Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.

Go to step 6.

6

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-

nector?

Correct or replace
the connector.

Go to step 10.

7

CHECK YAW RATE & LATERAL G SENSOR
HARNESS.
1) Disconnect the connector from VDCCM&H/
U.
2) Measure the resistance between
VDCCM&H/U and yaw rate & lateral G sensor.

Connector & terminal

(B310) No. 28 — (B230) No. 4:

Is the resistance less than 0.5
Ω?

Go to step 8.

Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.

8

CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.

Connector & terminal

(B310) No. 28 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 9.

Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.

9

CHECK YAW RATE & LATERAL G SENSOR.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Check the signal pattern of oscilloscope
between VDCCM&H/U connector terminals.
<Ref. to VDC(diag)-15, WAVEFORM, MEA-
SUREMENT, Control Module I/O Signal.>

Connector & terminal

(B310) No. 2 — No. 16:
(B310) No. 28 — No. 16:

Is the oscilloscope pattern the
same waveform as shown in
the figure?

Go to step 10.

Replace the yaw
rate & lateral G
sensor.

VDC(diag)-111

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

10

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?

Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step 11.

11

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC.

Temporary poor
contact occurs.

Step

Check

Yes

No

VDC(diag)-112

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AZ:DTC C0072 YAW RATE SENSOR REFERENCE

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