Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 547

VDC(diag)-87

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AM:DTC C0071 CHANGE RANGE OF STEERING ANGLE SENSOR IS TOO BIG

DTC DETECTING CONDITION:

Defective steering angle sensor

TROUBLE SYMPTOM:

VDC does not operate.

Step

Check

Yes

No

1

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

Go to step

2.

2

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)-88

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AN:DTC C0071 STEER ANGLE SENSOR OP

DTC DETECTING CONDITION:

Signal does not come from steering angle 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

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?

Go to step

2.

Repair the steering
angle sensor
power supply cir-
cuit.

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)-89

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

2

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 10

?

Go to step

3.

Repair ground cir-
cuit in the steering
angle sensor.

3

CHECK STEERING ANGLE SENSOR HAR-
NESS.
1) Disconnect the connector from the
VDCCM&H/U.
2) Measure the resistance between
VDCCM&H/U and steering angel sensor.

Connector & terminal

(B231) No. 1 — (B310) No. 10:
(B231) No. 2 — (B310) No. 35:

Is the resistance less than 1 ? Go to step

4.

Repair the harness
between the steer-
ing angle sensor
and VDCCM&H/U.

4

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 10 or more? Go to step

5.

Repair the harness
between the steer-
ing angle sensor
and VDCCM&H/U.

5

CHECK STEERING ANGLE 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

6.

Go to step

7.

6

CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the steering angle sensor. <Ref. to
VDC-22, Steering Angle 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

8.

7

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.

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).>

Original steering
angle sensor mal-
function

Step

Check

Yes

No

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VDC(diag)-90

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AO:DTC C0071 STEERING ANGLE SENSOR 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.

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