Subaru Legacy IV (2008 year). Manual - part 936

VDC(diag)-59

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

7

CHECK ECM SPECIFICATION.
Check the ECM specification.

Is the specification of ECM 
same as vehicle specification?

Go to step 8.

Replace the ECM. 
<Ref. to 
FU(H4SO)-39,
Engine Control 
Module (ECM).> 
<Ref. to 
FU(H4DOTC)-52, 
Engine Control 
Module (ECM).> 
<Ref. to 
FU(H6DO)-38, 
Engine Control 
Module (ECM).>

8

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.

Go to step 9.

9

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).>

It results from a 
temporary noise 
interference.

Step

Check

Yes

No

VDC(diag)-60

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AB:DTC C0045 TCM MALFUNCTION

DTC DETECTING CONDITION:
Defective TCM
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.

Step

Check

Yes

No

1

CHECK AT SYSTEM.
1) Start the engine.
2) Check the DTC in AT system.

Is DTC of AT system displayed? Repair the AT sys-

tem.

Go to step 2.

2

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.

Go to step 3.

3

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).>

It results from a 
temporary noise 
interference.

VDC(diag)-61

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AC:DTC C0047 CAN COMMUNICATION

DTC DETECTING CONDITION:
CAN communication line circuit is open or shorted.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

VDC00473

1 2 3 4

B310

VDCCM & H/U

25

10

35

B231

B230

2

4

1

1

4

2

3

3

STEERING
ANGLE
SENSOR

YAW RATE & 
LATERAL G 
SENSOR

E

E

B231

SBF-6

MAIN SBF

No.33

E

IGNITION
SWITCH

BATTERY

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 PAIR LINE

TWISTED PAIR LINE

B365

B170

CAN
JOINT
CONNECTOR

4

*

3

*

4

3

*

*

2

1 :

:

*

*

CAN
JOINT
CONNECTOR

TERMINAL No. OPTIONAL 
ARRANGEMENT AMONG 
1, 2, 3,11,12 AND 13

TERMINAL No. OPTIONAL 
ARRANGEMENT AMONG
8, 9, 10, 18, 19 AND 20 

4

3 :

:

*

*

TERMINAL No. OPTIONAL 
ARRANGEMENT AMONG 
1, 2, 5  AND 6 

TERMINAL No. OPTIONAL 
ARRANGEMENT AMONG
3, 4, 7 AND 8 

2

1

* *

2

1

* *

2

1

*

*

TWISTED
PAIR LINE

B170

3 4

5 6

1 2

7 8

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

B365

VDC(diag)-62

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to 
LAN(diag)-27, OPERATION, Read Diagnostic 
Trouble Code (DTC).>

Is there any fault in LAN sys-
tem?

Perform the diag-
nosis according to 
DTC for LAN sys-
tem.

Go to step 2.

2

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in 

VDCCM&H/U connector?

Repair the connec-
tor.

Go to step 3.

3

CHECK OUTPUT OF STEERING ANGLE 
SENSOR.
Connect the Subaru Select Monitor and check 
output of the steering angle sensor.

Does the output signal change? Go to step 4.

Check output of 
the steering angle 
sensor. <Ref. to 
VDC(diag)-81, 
DTC C0071 
STEER ANGLE 
SENSOR OP, 
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code 
(DTC).>

4

CHECK OUTPUT OF YAW RATE & LATERAL 
G SENSOR.
Connect the Subaru Select Monitor and check 
output of the yaw rate & lateral G sensor.

Does the output signal change? Go to step 5.

Check output of 
the yaw rate & lat-
eral G sensor. 
<Ref. to 
VDC(diag)-94, 
DTC C0072 YAW 
RATE SENSOR 
COMMUNICA-
TION, Diagnostic 
Procedure with 
Diagnostic Trouble 
Code (DTC).>

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).>

Temporary poor 
contact occurs.