Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 541

VDC(diag)-63

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK VDCCM&H/U INPUT VOLTAGE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Run the engine at idle.
4) Measure the voltage between VDCCM&H/U
connector and chassis ground.

Connector & terminal

(B310) No. 28 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step

2.

Repair the power
supply circuit.

2

CHECK VDCCM&H/U GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between
VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 25 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

3.

Repair the
VDCCM&H/U
ground harness.

3

CHECK POOR CONTACT OF CONNEC-
TORS.

Is there poor contact of connec-
tor between generator, battery
and VDCCM&H/U?

Repair the connec-
tor.

Go to step

4.

4

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM&H/U.
<Ref. to VDC-8,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step

5.

5

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)-64

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

W: DTC C0041 ECM

DTC DETECTING CONDITION:

Defective VDCCM&H/U

TROUBLE SYMPTOM:

• ABS does not operate.

• EBD does not operate.

• VDC does not operate.

WIRING DIAGRAM:

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

VDCCM & H/U

25

B310

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

VDC00464

VDC(diag)-65

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK VDCCM&H/U GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Measure the resistance between
VDCCM&H/U and chassis ground.

Connector & terminal

(B310) No. 25 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

2.

Repair the
VDCCM&H/U
ground harness.

2

CHECK POOR CONTACT OF CONNEC-
TORS.

Is there poor contact of the
connector between the battery,
ignition switch and
VDCCM&H/U?

Repair the connec-
tor.

Go to step

3.

3

CHECK CAUSE OF SIGNAL NOISE.

Are the radio wave devices and
electronic components
installed correctly?

Go to step

4.

Install the radio
wave devices and
electronic compo-
nents properly.

4

CHECK CAUSE OF SIGNAL NOISE.

Is there a noise source (such as
an antenna) installed near the
sensor harness?

Install the noise
sources apart from
sensor harness.

Go to step

5.

5

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) 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

6.

6

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)-66

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

X: DTC C0041 PARAMETER SELECTION ERROR

DTC DETECTING CONDITION:

VDCCM parameter selection error

TROUBLE SYMPTOM:

• ABS does not operate.

• EBD does not operate.

• VDC does not operate.
NOTE:

When the VDCCM or VDCCM&H/U is replaced, this DTC may be stored.

Step

Check

Yes

No

1

CHECK VDCCM&H/U REPLACEMENT HIS-
TORY.

Is there history of VDCCM
replacement by itself?

Go to step

2.

Go to step

3.

2

CHECK VDCCM IDENTIFICATION SYMBOL.
Check the identification symbol of the seal
attached on the side of the VDCCM. <Ref. to
VDC-2, SPECIFICATION, General Descrip-
tion.>

Is the identification symbol cor-
rect?

Go to step

4.

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

3

CHECK VDCCM&H/U IDENTIFICATION
SYMBOL.
Check the identification symbol stamped on the
upper part of the H/U. <Ref. to VDC-2, SPECI-
FICATION, General Description.>

Is the identification symbol cor-
rect?

Go to step

4.

Replace the
VDCCM&H/U.
<Ref. to VDC-8,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

4

CHECK PARAMETER SELECTED IN VDC-
CM.
<Ref. to VDC(diag)-21, PARAMETER CHECK,
OPERATION, Subaru Select Monitor.>

Does the parameter registered
in the VDCCM match the rele-
vant vehicle?

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

Select and register
the correct param-
eter. <Ref. to
VDC(diag)-21,
PARAMETER
SELECTION,
OPERATION, Sub-
aru Select Moni-
tor.>