Subaru Legacy (2005 year). Service manual - part 1043

LAN(diag)-51

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK TCM.
1) Disconnect the TCM connector (B54).
2) Perform the clear memory of body inte-
grated module. <Ref. to LAN(diag)-20, CLEAR 
MEMORY MODE, OPERATION, Subaru 
Select Monitor.>
3) Read DTC of body integrated module.

Is DTC B0202 displayed on 
Subaru Select Monitor?

Go to step 2.

Replace the TCM. 
<Ref. to 4AT-142, 
Transmission Con-
trol Device.> <Ref. 
to 5AT-61, Trans-
mission Control 
Module (TCM).>

2

CHECK STEERING ANGLE SENSOR.
1) Disconnect the steering angle sensor con-
nector (B231).
2) Perform the clear memory mode of body 
integrated module. <Ref. to LAN(diag)-20, 
CLEAR MEMORY MODE, OPERATION, Sub-
aru Select Monitor.>
3) Read DTC of body integrated module.

Is DTC B0202 displayed on 
Subaru Select Monitor?

Go to step 3.

Replace the steer-
ing angle sensor. 
<Ref. to VDC-17, 
REPLACEMENT, 
Steering Angle 
Sensor.>

3

CHECK BODY INTEGRATED MODULE.
1) Disconnect the body integrated module 
connector (B280).
2) Read the data between VDC/ABSCM and 
ECM.
Check item:
• Engine speed
• Average front wheel speed (value on con-
stant driving)

Engine speed, front wheel 
speed is correctly communi-
cated. (Appears same value)

Replace the body 
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

Go to step 4.

4

CHECK HARNESS.
1) Disconnect the body integrated module 
connector.
2) Measure the resistance between body inte-
grated module connector terminals.

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 55 — 65 

Ω?

Go to step 10.

Go to step 5.

5

CHECK HARNESS.
1) Disconnect the body integrated module 
connector.
2) Measure the resistance between body inte-
grated module connector terminals.

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 115 — 125 
Ω?

Go to step 7.

Go to step 6.

6

CHECK HARNESS.
1) Disconnect the harness connector of body 
integrated module.
2) Measure the resistance between body inte-
grated module connector terminals.

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance more than 30 
M

Ω?

Open harness on 
related line of body 
integrated mod-
ule. Repair or 
replace the open 
circuit of harness.

Go to step 7.

7

CHECK HARNESS.
1) Disconnect the VDC/ABSCM connector.
2) Measure the resistance between harness 
connector terminals.

Connector & terminal

ABS

(B301) No. 11 — No. 26:

VDC

(B310) No. 13 — No. 29:

Is the resistance 115 — 125 
Ω?

Go to step 8.

Go to step 9.

LAN(diag)-52

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

8

CHECK VDC/ABSCM.
1) Disconnect the VDC/ABSCM connector.
2) Measure the resistance between VDC/
ABSCM terminals.

Terminals

ABS

No. 11 — No. 26:

VDC

No. 13 — No. 29:

Is the resistance 115 — 125 
Ω?

Go to step 9.

Open harness in 
end resistance of 
VDC/ABSCM. 
Replace the VDC/
ABSCM. <Ref. to 
ABS-6, ABS Con-
trol Module and 
Hydraulic Control 
Unit (ABSCM&H/
U).> <Ref. to VDC-
7, VDC Control 
Module and 
Hydraulic Control 
Unit (VDCCM&H/
U).>

9

CHECK ECM.
1) Disconnect the ECM connector.
2) Measure the resistance between ECM ter-
minals.

Terminals

2.0 L SOHC RHD model, 2.5 L (KA) RHD 
model, 2.0 L LHD model and 2.5 L (KS) 
LHD model

(B136) No. 13 — No. 14:

Except for 2.0 L SOHC RHD and 2.5 L 
(KA) RHD model, 2.5 L (EC, K4) LHD mod-
el, 3.0 L LHD model

(B137) No. 18 — No. 26:

Is the resistance 115 — 125 
Ω?

Repair or replace 
the open circuit of 
harness connec-
tor.

Open harness in 
end resistance of 
ECM. Replace the 
ECM. <Ref. to 
FU(H4SO 2.0)-34, 
Engine Control 
Module (ECM).> 
<Ref. to FU(H4SO 
2.5)-37, Engine 
Control Module 
(ECM).> <Ref. to 
FU(H4DOTC)-34, 
Engine Control 
Module (ECM).> 
<Ref. to 
FU(H6DO)-34, 
Engine Control 
Module (ECM).>

10

CHECK HARNESS.
1) Disconnect the body integrated module 
connector.
2) Measure the resistance between body inte-
grated module connector and chassis ground.

Connector & terminal

(B280) No. 20 — Chassis ground:
(B280) No. 30 — Chassis ground:

Is the resistance less than 10 
Ω?

Repair or replace 
the ground short 
circuit of the har-
ness.

Go to step 11.

11

CHECK HARNESS.
1) Disconnect the body integrated module 
connector.
2) Measure the voltage between body inte-
grated module connector and chassis ground.

Connector & terminal

(B280) No. 20 (+) — Chassis ground (

−

):

(B280) No. 30 (+) — Chassis ground (

−

):

Is the voltage more than 6 V?

Repair or replace 
the short circuit of 
harness.

Go to step 12.

12

CHECK DTC.
Read the DTC of ECM using Subaru Select 
Monitor. <Ref. to EN(H4SO 2.0)(diag)-25, 
READ DIAGNOSTIC TROUBLE CODE (DTC) 
FOR ENGINE (NORMAL MODE), OPERA-
TION, Subaru Select Monitor.> <Ref. to 
EN(H4DOTC)(diag)-24, READ DIAGNOSTIC 
TROUBLE CODE (DTC) FOR ENGINE (NOR-
MAL MODE), OPERATION, Subaru Select 
Monitor.>

Is DTC other than “CAN com-
munication” displayed on Sub-
aru Select Monitor?

Perform the diag-
nosis according to 
DTC.

Go to step 13.

Step

Check

Yes

No

LAN(diag)-53

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

13

CHECK DTC.
Read the DTC of VDC/ABSCM using Subaru 
Select Monitor. <Ref. to ABS(diag)-15, READ 
DIAGNOSTIC TROUBLE CODE (DTC), 
OPERATION, Subaru Select Monitor.> <Ref. to 
VDC(diag)-16, READ DIAGNOSTIC TROU-
BLE CODE (DTC), OPERATION, Subaru 
Select Monitor.>

Is DTC other than “CAN com-
munication” displayed on Sub-
aru Select Monitor?

Perform the diag-
nosis according to 
DTC.

Go to step 14.

14

CHECK DTC.
Read the DTC of TCM using Subaru Select 
Monitor. <Ref. to 4AT(diag)-16, READ DIAG-
NOSTIC TROUBLE CODE (DTC), OPERA-
TION, Subaru Select Monitor.> <Ref. to 
5AT(diag)-17, READ DIAGNOSTIC TROUBLE 
CODE (DTC), OPERATION, Subaru Select 
Monitor.>

Is DTC other than “CAN com-
munication” displayed on Sub-
aru Select Monitor?

Perform the diag-
nosis according to 
DTC.

Replace the body 
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

Step

Check

Yes

No

LAN(diag)-54

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

L: DTC B0211 CAN-HS ECM DATA ABNORMAL

DTC DETECTING CONDITION:
Defective data from ECM.
TROUBLE SYMPTOM:
“Er HC” or “Er EG” is displayed in odo/trip meter.
WIRING DIAGRAM:

LAN00114

B20

B30

TWISTED WIRE

BODY INTEGRATED

MODULE

B280

B:

ECM

B137

D:

C14

C13

D26

D18

B136

C:

ABSCM & H/U
VDCCM & H/U

TCM

B280

B:

5

4

6 7

8

2

1

9

3

10

22

23

11 12 13 14 15

24 25

26 27

16 17 18

28 29

19 20

21

30

B137

5

6

7

8

2

1

9

4

3

10

22 23

11 12 13 14 15

24 25

26

16 17

18 19 20 21

27

28 29

30 31

D:

*

1

*

2

B136

5

6

7 8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31

35

C:

1

*

: 2.0 L SOHC RHD MODEL;
  2.5 L (KA) RHD MODEL;
  2.0 L LHD MODEL;
  2.5 L (KS) LHD MODEL

2

*

: EXCEPT FOR 2.0 L SOHC 
  RHD AND 2.5 L (KA) RHD
  MODEL;
  2.5 L (EC, K4) LHD MODEL;
  3.0 L LHD MODEL