Subaru Legacy IV (2008 year). Manual — part 1182

LAN(diag)-62

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

3

CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.

Is the DTC displayed a current
malfunction?

Go to step 5.

Go to step 4.

4

CHECK CURRENT DATA.
Using the Subaru Select Monitor, display
engine speed and vehicle speed signal from
ECM, TCM, VDC/ABS and body integrated unit
under the same conditions and compare data.

Do all data values match?

Temporary poor
contact occurs.
Perform the Clear
Memory operation.

Go to step 5.

5

CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connectors.

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 55 — 65

:?

(Specification 60

:)

Go to step 8.

Go to step 6.

6

CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connectors.

Connector & terminal

(B280) No. 20 — No. 30:

Is the resistance 115 — 125

:?

(End resistance or main wiring
harness is open.)

Go to step 7.

If the resistance is
1 M

: or larger, a

line related to the
body integrated
unit is open. Repair
the open circuit of
harness or replace
harness.

7

CHECK ECM.
Read the DTC of ECM using the Subaru Select
Monitor. <Ref. to EN(H6DO)(diag)-43, SUB-
ARU SELECT MONITOR (NORMAL MODE),
OPERATION, Read Diagnostic Trouble Code
(DTC).>

Are there any DTCs other than
one for “CAN communication”?

Perform the diag-
nosis according to
DTC. <Ref. to
EN(H6DO)(diag)-
43, SUBARU
SELECT MONI-
TOR (NORMAL
MODE), OPERA-
TION, Read Diag-
nostic Trouble
Code (DTC).>

Go to step 8.

8

CHECK BODY INTEGRATED UNIT.
1) Connect all the control module connectors.
2) Check the data of “body integrated unit data
received” on the current data display of ECM
using Subaru Select Monitor.

Is the “ON” displayed?

Go to step 9.

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

9

CHECK BODY INTEGRATED UNIT.
Check the data of “body integrated unit counter
update” on the data display of ECM.

Is the “ON” displayed?

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

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

Step

Check

Yes

No

LAN(diag)-63

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

N: DTC U1222 CAN-HS TCM NO-RECEIVE DATA

DTC DETECTING CONDITION:
TCM has error, harness between the main harness splice and TCM is open or shorted, connectors are not
connected securely, or the terminal has poor crimping.
TROUBLE SYMPTOM:
• Malfunction indicator light illuminates.
• “Er HC” is displayed in odo/trip meter. (Except for meter with MID)
WIRING DIAGRAM:

LAN00382

B40

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

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

B231

1 2 3 4

A: B54

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

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

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

B301

4 5 6 7 8 9

16 17 18 19 20

2 3

1

21 22 23 24 25 26

10 11

13

14

12

15

C: B136

B:

B55

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

2

3

B230

YAW RATE

SENSOR

B231

2

1

STEERING

ANGLE

SENSOR

VDCCM & H/U

B310

35

10

ECM

B136

27

35

B30

B20

BODY

INTEGRATED UNIT

B280

B:

6

14

B170

B365

B40

CAN JOINT
CONNEC-
TOR

CAN JOINT
CONNECTOR

DATA LINK

CONNECTOR

2

*

1

*

2

*

1

*

3

*

4

*

2

*

1

*

2

*

1

*

2

*

1

*

2

*

1

*

3

*

4

*

3

*

4

*

VDC

VDC

VDC

VDC

ABS

ABS

ABS

ABS

ABSCM & H/U

B301

26

11

VDC

ABS

ABS

TCM

B54

A:

4AT MODEL

5AT MODEL

B21

B20

A18

A17

B55

B:

VDC

*

1

*

2

*

3

*

4

: WITHOUT VDC

ABS

VDC

: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 3, 11, 12 AND 13
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 8, 9, 10, 18, 19 AND 20
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 5 AND 6
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 3, 4, 7 AND 8

: WITH VDC

LAN(diag)-64

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK DTC.
Connect the Subaru Select Monitor and read all
DTCs.

Is there any DTC other than for
the body integrated unit?

Perform the diag-
nosis according to
the DTC of other
control modules.

Go to step 2.

2

CHECK DTC.
Check the DTC displayed in the body integrated
unit.

Is the DTC displayed a current
malfunction?

Check the connec-
tion of harness
connectors. Go to
step 3.

Go to step 3.

3

CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.

Is the DTC displayed a current
malfunction?

Go to step 5.

Go to step 4.

4

CHECK CURRENT DATA.
Using the Subaru Select Monitor, display
engine speed and vehicle speed signal from
ECM, TCM, VDC/ABS and body integrated unit
under the same conditions and compare data.

Do all data values match?

Temporary poor
contact occurs.
Perform the Clear
Memory operation.

Go to step 5.

5

CHECK HARNESS.
1) Disconnect the TCM connector (B54 or
B55).
2) Measure the resistance between harness
connector terminals.

Connector & terminal

4AT model:

(B54) No. 17 — No. 18:

5AT model:

(B55) No. 20 — No. 21:

Is the resistance 1 M

: or

more?

Open circuit in
related lines of
TCM. Repair the
open circuit of har-
ness or replace
harness.

Go to step 6.

6

CHECK TCM.
Read the DTC of the TCM using Subaru Select
Monitor. <Ref. to 5AT(diag)-18, OPERATION,
Subaru Select Monitor.>

Is DTC other than “CAN com-
munication” displayed?

Perform the diag-
nosis according to
DTC.

Go to step 7.

7

CHECK BODY INTEGRATED UNIT.
1) Connect all the control module connectors.
2) Check the data of “body integrated unit data
received” on the current data display of ECM
using Subaru Select Monitor.

Is the “ON” displayed?

Go to step 8.

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

8

CHECK BODY INTEGRATED UNIT.
Check the data of “body integrated unit counter
update” on the data display of ECM.

Is the “ON” displayed?

Replace the TCM.
<Ref. to 4AT-61,
REMOVAL, Trans-
mission Control
Module (TCM).>
<Ref. to 5AT-60,
REMOVAL, Trans-
mission Control
Module (TCM).>

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

LAN(diag)-65

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

O: DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA

DTC DETECTING CONDITION:
Defective VDC/ABSCM. (If error is in the main harness, DTC P0600 High-speed CAN circuit is input at the
same time.
TROUBLE SYMPTOM:
• ABS warning light and VDC warning light come on.
• “Er HC” is displayed in odo/trip meter. (Except for meter with MID)
WIRING DIAGRAM:

LAN00382

B40

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

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

B231

1 2 3 4

A: B54

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

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

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

B301

4 5 6 7 8 9

16 17 18 19 20

2 3

1

21 22 23 24 25 26

10 11

13

14

12

15

C: B136

B:

B55

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

2

3

B230

YAW RATE

SENSOR

B231

2

1

STEERING

ANGLE

SENSOR

VDCCM & H/U

B310

35

10

ECM

B136

27

35

B30

B20

BODY

INTEGRATED UNIT

B280

B:

6

14

B170

B365

B40

CAN JOINT
CONNEC-
TOR

CAN JOINT
CONNECTOR

DATA LINK

CONNECTOR

2

*

1

*

2

*

1

*

3

*

4

*

2

*

1

*

2

*

1

*

2

*

1

*

2

*

1

*

3

*

4

*

3

*

4

*

VDC

VDC

VDC

VDC

ABS

ABS

ABS

ABS

ABSCM & H/U

B301

26

11

VDC

ABS

ABS

TCM

B54

A:

4AT MODEL

5AT MODEL

B21

B20

A18

A17

B55

B:

VDC

*

1

*

2

*

3

*

4

: WITHOUT VDC

ABS

VDC

: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 3, 11, 12 AND 13
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 8, 9, 10, 18, 19 AND 20
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 5 AND 6
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 3, 4, 7 AND 8

: WITH VDC