Subaru Legacy (2005 year). Manual - part 799

VDC(diag)-61

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

VDC00309

MAIN SBF

SBF-6

No.33

B310

B310

E

E

6

14

VDCCM & H/U

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

BATTERY

GENERATOR

IGNITION
SWITCH

VDC(diag)-62

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from 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. 14 (+) — Chassis ground (

−

):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the power 
supply circuit.

2

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

Connector & terminal

(B310) No. 6 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Go to step 3.

Repair the 
VDCCM&H/U 
ground harness.

3

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

nector between generator, bat-
tery and VDCCM&H/U?

Repair the con-
nector.

Go to step 4.

4

CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Perform the 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.

Temporary poor 
contact occurs.

VDC(diag)-63

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Z: DTC C0041 VDC CONTROL MODULE MALFUNCTION

DTC DETECTING CONDITION:
Defective VDCCM&H/U
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate.
• VDC does not operate.
WIRING DIAGRAM:

VDC00217

VDCCM & H/U

6

B310

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

VDC(diag)-64

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AA:DTC C0042 POWER VOLTAGE MALFUNCTION

DTC DETECTING CONDITION:
Defective VDCCM&H/U power voltage
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD may not operate.
• VDC does not operate.

NOTE:
Warning lights go off if voltage returns.

Step

Check

Yes

No

1

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

Connector & terminal

(B310) No. 6 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Go to step 2.

Repair the 
VDCCM&H/U 
ground harness.

2

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

nectors between battery, igni-
tion switch and VDCCM&H/U?

Repair the con-
nector.

Go to step 3.

3

CHECK SOURCES OF SIGNAL NOISE.

Are the radio wave devices and 
electric components installed 
correctly?

Go to step 4.

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

4

CHECK SOURCES OF SIGNAL NOISE.

Are noise sources (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 the connectors.
2) Perform the clear memory mode.
3) Perform the 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 6.

6

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC. <Ref. to 
VDC(diag)-38, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.