Subaru Legacy IV (2008 year). Manual - part 934

 

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Subaru Legacy IV (2008 year). Manual - part 934

 

 

VDC(diag)-51

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 0.5 

:? Go to step 3.

Repair the 
VDCCM&H/U 
ground harness.

3

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in 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)-23, 
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to 
VDC(diag)-22, Inspection Mode.>
4) 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 5.

5

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC. <Ref. to 
VDC(diag)-34, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

VDC(diag)-52

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:

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)-53

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 0.5 

:? Go to step 2.

Repair the 
VDCCM&H/U 
ground harness.

2

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

nector between the battery, igni-
tion 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 
source apart from 
the sensor har-
ness.

Go to step 5.

5

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23, 
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to 
VDC(diag)-22, Inspection Mode.>
4) Read the DTC. 

Is the same DTC displayed?

Replace the 
VDCCM only. 
<Ref. to VDC-10, 
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)-34, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

VDC(diag)-54

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

X: DTC C0041 PARAMETER SELECTION ERROR

DTC DETECTING CONDITION:
VDCCM parameter selection failure
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 memorized.

Step

Check

Yes

No

1

CHECK VDCCM&H/U REPLACEMENT HIS-
TORY.

Is there replacement history of 
VDCCM alone?

Go to step 2.

Go to step 3.

2

CHECK VDCCM IDENTIFICATION NUMBER.
Check the identification number on the sticker 
attached on the VDCCM side.
AT:

T3 (2.5 L turbo models and OUTBACK 3.0 L 
models)
T7 (Sedan 3.0L with 18 inch tire model)
TA (2.5L non-turbo model and sedan 3.0L 
with 17 inch tire model)

MT:

T4 (2.5L turbo model)
TB (2.5L non-turbo model)

Is the identification number cor-
rect?

Go to step 4.

Replace the 
VDCCM only.

3

CHECK VDCCM&H/U IDENTIFICATION 
NUMBER.
Check the identification number stamped on the 
upper side of the H/U.
AT:

T3 (2.5 L turbo models and OUTBACK 3.0 L 
models)
T7 (Sedan 3.0L with 18 inch tire model)
TA (2.5L non-turbo model and sedan 3.0L 
with 17 inch tire model)

MT:

T4 (2.5L turbo model)
TB (2.5L non-turbo model)

Is the identification number cor-
rect?

Go to step 4.

Replace the 
VDCCM&H/U.

4

CHECK PARAMETER SELECTED FOR VDC-
CM.
<Ref. to VDC(diag)-17, PARAMETER CHECK, 
OPERATION, Subaru Select Monitor.>

Does the parameter registered 
to the VDCCM match with the 
target vehicle?

Replace the 
VDCCM only.

Select and register 
the correct param-
eter. <Ref. to 
VDC(diag)-16, 
PARAMETER 
SELECTION, 
OPERATION, Sub-
aru Select Moni-
tor.>

 

 

 

 

 

 

 

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