Subaru Legacy (2005 year). Service manual - part 1045

LAN(diag)-59

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

O: DTC B0221 CAN-HS ECM NO-RECEIVE DATA

DTC DETECTING CONDITION:
Defective ECM. (If error is in the main harness, DTC P0600 High-speed CAN circuit is input simultaneously.)
TROUBLE SYMPTOM:
• Malfunction indicator light illuminates.
• “Er HC” 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

LAN(diag)-60

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

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

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 55 — 65 

Ω?

Read the DTC of 
ECM. Perform the 
diagnosis accord-
ing to DTC. <Ref. 
to EN(H4SO 
2.0)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4SO 
2.5)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4DOTC)(diag
)-24, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.> 
<Ref. to 
EN(H6DO)(diag)-
26, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.>

Go to step 2.

2

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

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 115 — 125 
Ω?

Go to step 3.

∞ Ω Related line of 
body integrated 
module is open 
when. Repair or 
replace the open 
circuit of harness.

LAN(diag)-61

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

3

CHECK HARNESS.
1) Disconnect the ECM connector.
2) Measure the resistance between harness 
connector terminals.

Connector & terminal

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?

Go to step 4.

Go to step 5.

4

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?

Read the DTC of 
ECM. Perform the 
diagnosis accord-
ing to DTC. <Ref. 
to EN(H4SO 
2.0)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4SO 
2.5)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4DOTC)(diag
)-24, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.> 
<Ref. to 
EN(H6DO)(diag)-
26, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.>

End resistance is 
open. 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).>

Step

Check

Yes

No

LAN(diag)-62

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

5

CHECK HARNESS.
1) Disconnect the ECM connector.
2) Measure the resistance between ECM con-
nector and chassis ground.

Connector & terminal
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 — Chassis ground:
(B136) No. 14 — Chassis ground:

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

(B137) No. 18 — Chassis ground:
(B137) No. 26 — Chassis ground:

Is the resistance less than 10 
Ω?

Repair or replace 
the short circuit of 
harness.

Go to step 6.

6

CHECK HARNESS.
1) Disconnect the body integrated module 
(B280), ECM (B136, B137), TCM (B54), ABS 
(B301)/VDC (B310) CM connectors.
2) Measure the input voltage between body 
integrated module connector and chassis 
ground while turning the ignition switch to ON.

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 
the harness.

Read the DTC of 
ECM. Perform the 
diagnosis accord-
ing to DTC. <Ref. 
to EN(H4SO 
2.0)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4SO 
2.5)(diag)-25, 
READ DIAGNOS-
TIC TROUBLE 
CODE (DTC) FOR 
ENGINE (NOR-
MAL MODE), 
OPERATION, 
Subaru Select 
Monitor.> <Ref. to 
EN(H4DOTC)(diag
)-24, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.> 
<Ref. to 
EN(H6DO)(diag)-
26, READ DIAG-
NOSTIC TROU-
BLE CODE (DTC) 
FOR ENGINE 
(NORMAL 
MODE), OPERA-
TION, Subaru 
Select Monitor.>

Step

Check

Yes

No