Subaru Legacy IV (2008 year). Manual - part 314

EN(H4DOTC)(diag)-77

Diagnostics for Engine Starting Failure

ENGINE (DIAGNOSTICS)

F: FUEL INJECTOR CIRCUIT

CAUTION:
• Check or repair only faulty parts.
• After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(di-
ag)-52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43,
PROCEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-05668

E

#4

1

2

SBF-7

#3

1

2

#2

1

2

B21

#1

1

2

48

54

53

52

51

8

9

10

11

1 2

5
3

6
4

2
1

B21

B137

E5

E5

E2

E6

E6

E16

E16

E17

B47

E17

B47

3

4

1

2

5

6

B137

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

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

MAIN RELAY

ECM

BATTERY

FUEL INJECTOR

EN(H4DOTC)(diag)-78

Diagnostics for Engine Starting Failure

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check each fuel 
injector emits operating sound. Use a sound 
scope or attach a screwdriver to the injector for 
this check.

Does the fuel injector emit 
operating sound?

Check the fuel 
pressure. <Ref. to 
ME(H4DOTC)-25, 
INSPECTION,
Fuel Pressure.>

Go to step 2.

2

CHECK POWER SUPPLY TO EACH FUEL IN-
JECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the voltage between fuel injector 
connector and the engine ground.

Connector & terminal

#1 (E5) No. 2 (+) — Engine ground (–):
#2 (E16) No. 2 (+) — Engine ground (–):
#3 (E6) No. 2 (+) — Engine ground (–):
#4 (E17) No. 2 (+) — Engine ground (–):

Is the voltage 10 V or more?

Go to step 3.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact of
main relay connec-
tor
• Poor contact of
coupling connector

3

CHECK HARNESS BETWEEN ECM AND 
FUEL INJECTOR CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between 
ECM and fuel injector connector.

Connector & terminal

(B137) No. 8 — (E5) No. 1:
(B137) No. 9 — (E16) No. 1:
(B137) No. 10 — (E6) No. 1:
(B137) No. 11 — (E17) No. 1:

Is the resistance less than 1 

:? Go to step 4.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and fuel in-
jector connector
• Poor contact of
coupling connector

4

CHECK HARNESS BETWEEN ECM AND 
FUEL INJECTOR CONNECTOR.
Measure the resistance between ECM and 
chassis ground.

Connector & terminal

(B137) No. 8 — Chassis ground:
(B137) No. 9 — Chassis ground:
(B137) No. 10 — Chassis ground:
(B137) No. 11 — Chassis ground:

Is the resistance 1 M

: or 

more?

Go to step 5.

Repair the short 
circuit to ground in 
harness between 
ECM and fuel 
injector connector.

5

CHECK EACH FUEL INJECTOR.
Measure the resistance between each fuel 
injector terminals.

Terminals

No. 1 — No. 2:

Is the resistance between 5 — 
20 

:?

Go to step 6.

Replace the faulty 
fuel injector. <Ref. 
to FU(H4DOTC)-
38, Fuel Injector.>

6

CHECK POOR CONTACT.
Check for poor contact of the ECM connector.

Is there poor contact in ECM 
connector?

Repair the poor 
contact of ECM 
connector.

Inspection using 
“General Diagnos-
tic Table” <Ref. to 
EN(H4DOTC)(diag)
-370, INSPEC-
TION, General 
Diagnostic Table.>

EN(H4DOTC)(diag)-79

Diagnostic Procedure for Subaru Select Monitor Communication

ENGINE (DIAGNOSTICS)

18.Diagnostic Procedure for Subaru Select Monitor Communication

A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DIAGNOSIS:
Open or short circuit in data link connector
TROUBLE SYMPTOM:
Subaru Select Monitor communication failure
WIRING DIAGRAM:

EN-06954

: TERMINAL No. OPTIONAL ARRANGEMENT

*

No. 13

E

BATTERY

B40

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

B21

1 2 3 4 5 6 7 8 9 10 11

12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33

34

35

42

43

36

37

38

39

48

49

50

51

52

53

54

40

41

44

45

46

47

B40

DATA LINK 

CONNECTOR

4

5

7

16

B122

*

*

1 2 3 4
5 6 7 8

B122

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

B136

C:

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

B134

A:

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

B137

D:

D2

A5

D3

E2

B21

E

ECM

B134

A:

C: B136

D: B137

D7

D1

C6

C16

35

34

40

36

37

EN(H4DOTC)(diag)-80

Diagnostic Procedure for Subaru Select Monitor Communication

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POWER SUPPLY CIRCUIT.
Connect the SDI (Subaru Diagnosis Interface) 
or general scan tool to data link connector.

Does SDI or general scan tool 
turn ON?

Go to step 4.

Go to step 2.

2

CHECK POWER SUPPLY CIRCUIT.
Measure the voltage between data link connec-
tor and chassis ground.

Connector & terminal

(B40) No. 16 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step 3.

Repair the power 
supply circuit.

NOTE:
In this case, repair
the following item:
• Open or ground
short circuit of har-
ness between bat-
tery and data link
connector
• Blown out of fuse
(M/B No. 13)

3

CHECK HARNESS BETWEEN DATA LINK 
CONNECTOR AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between 
data link connector and chassis ground.

Connector & terminal

(B40) No. 4 — Chassis ground:
(B40) No. 5 — Chassis ground:

Is the resistance less than 5 

:? Repair the poor 

contact of data link 
connector.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and data link
connector
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector

4

CHECK HARNESS BETWEEN ECM AND 
DATA LINK CONNECTOR.
1) Disconnect the connector from ECM, TCM, 
VDC CU, airbag CM and body integrated unit.

CAUTION:
When disconnecting the connector from air-
bag control module, always follow the pre-
cautions on AB section. <Ref. to AB-4,
CAUTION, General Description.>
2) Measure the resistance of harness between 
ECM and data link connector.

Connector & terminal

(B136) No. 16 — (B40) No. 7:

Is the resistance less than 1 

:? Go to step 5.

Repair the open 
circuit of harness 
between ECM and 
data link connec-
tor.

5

CHECK HARNESS BETWEEN ECM AND 
DATA LINK CONNECTOR.
Measure the resistance between data link con-
nector and chassis ground.

Connector & terminal

(B40) No. 7 — Chassis ground:

Is the resistance 1 M

: or 

more?

Repair the poor 
contact in the ECM 
or data link con-
nector.

Repair the ground 
short circuit of har-
ness between 
ECM and data link 
connector.