Subaru Legacy IV (2008 year). Manual - part 940

 

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Subaru Legacy IV (2008 year). Manual - part 940

 

 

VDC(diag)-75

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AK:DTC C0057 ECM COMMUNICATION CIRCUIT

DTC DETECTING CONDITION:
No CAN signal from ECM.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.

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 ECM 

connector?

Repair the connec-
tor.

Go to step 3.

3

CHECK ECM.

Is ECM normal?

Go to step 4.

Replace the ECM.

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 only. 
<Ref. to VDC-10, 
REPLACEMENT, 
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).>

It results from a 
temporary noise 
interference.

VDC(diag)-76

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AL:DTC C0057 ECM CONTROL SYSTEM

DTC DETECTING CONDITION:
Cooperation control prohibition of ECM
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.

NOTE:
Warning lights go off if the cooperation control of ECM returns.

Step

Check

Yes

No

1

CHECK WARNING LIGHT.
Check whether the VDC warning light illumi-
nates after driving for 1 minute or more at a 
speed of 10 km/h or more.

Does the VDC warning light illu-
minate?

Go to step 2.

VDC is normal. 
Perform the Clear 
Memory Mode. 

NOTE:
If cranking opera-
tion is performed
while driving, DTC
may be memo-
rized.

2

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in ECM 

connector?

Repair the connec-
tor.

Go to step 3.

3

CHECK ECM.

Is ECM normal?

Go to step 4.

Replace the ECM.

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 only. 
<Ref. to VDC-10, 
REPLACEMENT, 
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).>

It results from a 
temporary noise 
interference.

VDC(diag)-77

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AM:DTC C0071 STEERING ANGLE SENSOR OFFSET IS TOO BIG

DTC DETECTING CONDITION:
Defective steering angle sensor
TROUBLE SYMPTOM:
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)-78

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK STEERING WHEEL.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Check the steering wheel for deviation from 
center.

Is the deviation from the center 
of steering wheel less than 5°?

Go to step 2.

Perform the cen-
tering adjustment 
of steering wheel.

2

CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Clear the memory. <Ref. to VDC(diag)-23, 
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to 
VDC(diag)-22, Inspection Mode.>
5) 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 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).>

Temporary poor 
contact occurs.

 

 

 

 

 

 

 

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