Subaru Legacy IV (2008 year). Manual — part 526

EN(H6DO)(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(H6DO)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:

3

4

1

2

5

6

1 2

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

B47

B137

E6

E17

E5

E16

E43

E44

1

2

E5

8

42

B47

MAIN RELAY

1

2

3

5

4

6

48

1

2

E16

1

2

E6

10

ECM

BATTERY

SBF-7

B137

9

43

44

FUEL

INJECTOR

No. 1

1

2

E17

1

2

E43

11

45

12

46

1

2

E44

E

B21

E2

13

47

EN-06776

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

FUEL

INJECTOR

No. 2

FUEL

INJECTOR

No. 3

FUEL

INJECTOR

No. 4

FUEL

INJECTOR

No. 5

FUEL

INJECTOR

No. 6

EN(H6DO)(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 pump emit oper-
ating sound?

Check the fuel
pressure. <Ref. to
ME(H6DO)-27,
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 (–):
#5 (E43) No. 2 (+) — Engine ground (–):
#6 (E44) 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) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness between
ECM and fuel injector connector.

Connector & terminal

#1 (B137) No. 8 — (E5) No. 1:
#2 (B137) No. 9 — (E16) No. 1:
#3 (B137) No. 10 — (E6) No. 1:
#4 (B137) No. 11 — (E17) No. 1:
#5 (B137) No. 12 — (E43) No. 1:
#6 (B137) No. 13 — (E44) 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

#1 (B137) No. 8 — Chassis ground:
#2 (B137) No. 9 — Chassis ground:
#3 (B137) No. 10 — Chassis ground:
#4 (B137) No. 11 — Chassis ground:
#5 (B137) No. 12 — Chassis ground:
#6 (B137) No. 13 — 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(H6DO)-28,
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(H6DO)(diag)-
353, INSPEC-
TION, General
Diagnostic Table.>

EN(H6DO)(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-06866

: 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

A3

C6

C16

35

34

52

36

37

D1

EN(H6DO)(diag)-80

Diagnostic Procedure for Subaru Select Monitor Communication

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POWER SUPPLY CIRCUIT.
Connect the SDI (Subaru Diagnostic Interface)
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.