Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 549

VDC(diag)-95

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

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

Connector & terminal

(B230) No. 1 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step

2.

Repair the yaw rate
& G sensor power
supply circuit.

2

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

Connector & terminal

(B230) No. 4 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

3.

Repair the yaw rate
& G sensor ground
circuit.

3

CHECK YAW RATE & G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
5) Read the DTC.

Is the same DTC displayed?

Replace the yaw
rate & G sensor.
<Ref. to VDC-20,
Yaw Rate and G
Sensor.>

Go to step

4.

4

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-48, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

VDC(diag)-96

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AR:DTC C0072 CHANGE RANGE OF YAW RATE SENSOR SIGNAL IS TOO BIG

DTC DETECTING CONDITION:

Defective yaw rate sensor

TROUBLE SYMPTOM:

VDC does not operate.

WIRING DIAGRAM:

Vehicle dynamics control system <Ref. to WI-67, Vehicle Dynamics Control System.>

Step

Check

Yes

No

1

INTERVIEW CUSTOMERS.
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).

Go to step

2.

2

CHECK YAW RATE & G SENSOR INSTAL-
LATION.

Is the yaw rate & G sensor
installation bolt tightened to 7.5
N·m (0.76 kgf-m, 5.5 ft-lb)?

Go to step

3.

Tighten the yaw
rate & G sensor
installation bolt.

VDC00702

1 2 3 4

B310 VDCCM & H/U

25

10

35

B231

B230

2

4

1

3

1

4

2

3

STEERING

ANGLE

SENSOR

YAW RATE &

G SENSOR

E

B231

SBF-6

MAIN SBF

No.33

E

IGNITION SWITCH

BATTERY

E

B310

4 5 6 7 8 9

26 27 28 29 30

2 3

1

31 32 33 34 35 36

10 11

14 15 16 17 18 19

37 38 39 40

12 13

41 42 43 44 45 46

20 21

23 24

22

25

B230

1

2

3

4

TWISTED P

AIR LINE

TWISTED P

AIR LINE

TWISTED PAIR LINE

VDC(diag)-97

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

3

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

Connector & terminal

(B230) No. 1 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step

4.

Repair the yaw rate
& G sensor power
supply circuit.

4

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

Connector & terminal

(B230) No. 4 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

5.

Repair the yaw rate
& G sensor ground
circuit.

5

CHECK OUTPUT OF YAW RATE & G SEN-
SOR WITH SUBARU SELECT MONITOR.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Select “Current Data Display & Save” on the
Subaru Select Monitor. <Ref. to VDC(diag)-19,
READ CURRENT DATA, OPERATION, Subaru
Select Monitor.>
4) Read the «Yaw Rate Sensor Output» dis-
played on display.

Is the reading indicated on
monitor display –4 — 4 deg/s?

Go to step

6.

Replace the yaw
rate & G sensor.
<Ref. to VDC-20,
Yaw Rate and G
Sensor.>

6

CHECK YAW RATE & G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
5) Read the DTC.

Is the same DTC displayed?

Go to step

7.

Go to step

8.

7

CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the yaw rate & G sensor. <Ref. to
VDC-20, Yaw Rate and G Sensor.>
3) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
5) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM only.
<Ref. to VDC-12,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step

9.

8

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-48, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

9

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-48, List
of Diagnostic Trou-
ble Code (DTC).>

Malfunction is
found in original
yaw rate & G sen-
sor.

Step

Check

Yes

No

VDC(diag)-98

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AS:DTC C0072 YAW RATE SENSOR COMMUNICATION

DTC DETECTING CONDITION:

Communication failure between yaw rate sensor and VDCCM

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>

VDC00702

1 2 3 4

B310 VDCCM & H/U

25

10

35

B231

B230

2

4

1

3

1

4

2

3

STEERING

ANGLE

SENSOR

YAW RATE &

G SENSOR

E

B231

SBF-6

MAIN SBF

No.33

E

IGNITION SWITCH

BATTERY

E

B310

4 5 6 7 8 9

26 27 28 29 30

2 3

1

31 32 33 34 35 36

10 11

14 15 16 17 18 19

37 38 39 40

12 13

41 42 43 44 45 46

20 21

23 24

22

25

B230

1

2

3

4

TWISTED P

AIR LINE

TWISTED P

AIR LINE

TWISTED PAIR LINE