Subaru Legacy IV (2008 year). Service manual - part 584

EN(H6DO)(diag)-309

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL 
FLOW CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and 
oil flow control solenoid valve.
3) Measure the resistance of harness between 
ECM and oil flow control solenoid valve.

Connector & terminal

(B137) No. 15 — (E68) No. 1:
(B137) No. 14 — (E68) No. 2:

Is the resistance less than 1 

:? Go to step 2.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
the harness be-
tween the ECM
and oil flow control
solenoid valve
connector
• Poor contact of
coupling connector

2

CHECK HARNESS BETWEEN ECM AND OIL 
FLOW CONTROL SOLENOID VALVE.
Measure the resistance between ECM and 
chassis ground.

Connector & terminal

(B137) No. 15 — Chassis ground:
(B137) No. 14 — Chassis ground:

Is the resistance 1 M

: or 

more?

Go to step 3.

Repair the short 
circuit to ground in 
harness between 
ECM and oil flow 
control solenoid 
valve connector.

3

CHECK OIL FLOW CONTROL SOLENOID 
VALVE.
Measure the resistance between oil flow control 
solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance between 6 — 
12 

:?

Repair the poor 
contact of ECM 
and oil flow control 
solenoid valve con-
nector.

Replace the oil 
flow control sole-
noid valve. <Ref. to 
ME(H6DO)-55,
Camshaft.>

EN(H6DO)(diag)-310

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DW:DTC P2093 INTAKE CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT 

HIGH (BANK 2)

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-186, DTC P2093 INTAKE CAMSHAFT POSITION ACTU-
ATOR CONTROL CIRCUIT HIGH (BANK 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling

CAUTION:
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, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-06882

B21

E2

B137

E68

14

2

1

28

27

15

ECM

OIL FLOW CONTROL

SOLENOID VALVE LH

E68

1 2

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

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

EN(H6DO)(diag)-311

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DX:DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN (BANK 1)

NOTE:
Refer to DTC P2097 for diagnostic procedure. <Ref. to EN(H6DO)(diag)-312, DTC P2097 POST CATALYST
FUEL TRIM SYSTEM TOO RICH (BANK 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL 
FLOW CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and 
oil flow control solenoid valve.
3) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B137) No. 15 (+) — Chassis ground (–):
(B137) No. 14 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Go to step 2.

Repair the short 
circuit to power in 
harness between 
ECM and oil flow 
control solenoid 
valve connector.

2

CHECK HARNESS BETWEEN ECM AND OIL 
FLOW CONTROL SOLENOID VALVE.
Measure the resistance of harness between 
ECM and oil flow control solenoid valve connec-
tor.

Connector & terminal

(B137) No. 15 — (E68) No. 1:
(B137) No. 14 — (E68) No. 2:

Is the resistance less than 1 

:? Go to step 3.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
the harness be-
tween the ECM
and oil flow control
solenoid valve
connector
• Poor contact of
coupling connector

3

CHECK OIL FLOW CONTROL SOLENOID 
VALVE.
Measure the resistance between oil flow control 
solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance between 6 — 
12 

:?

Repair the poor 
contact of ECM 
and oil flow control 
solenoid valve con-
nector.

Replace the oil 
flow control sole-
noid valve. <Ref. to 
ME(H6DO)-55,
Camshaft.>

EN(H6DO)(diag)-312

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DY:DTC P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH (BANK 1)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-189, DTC P2097 POST CATALYST FUEL TRIM SYS-
TEM TOO RICH (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

CAUTION:
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, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

SBF-5

BATTERY

E

E3

B22

B47

1

2

3

5

4

6

MAIN RELAY

E3

B22

8

 : TERMINAL No. OPTIONAL ARRANGEMENT 
  AMONG 1, 2, 5 AND 6

*

3

4

5

6

1

2

B47

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B22

3 4

1 2

E47

E24

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

22 23

11 12 13 14 15

24 25

26

16 17

18 19 20 21

27

28 29

30 31

B137

D:

1 2 3 4
5 6 7 8

B138

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

29 30 31

32 33

34 35

B135

B:

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:

B11

2

E24

FRONT 

OXYGEN (A/F) 

SENSOR LH

3

4

B10

1

B7

B6

C2

C3

B8

4

1

3

B9

ECM

B135

B:

B134

A:

B137

D:

B136

C:

D3

A3

D2

D1

D7

A5

35

34

52

36

37

B21

E2

E

E

EN-06867

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

2

E47

FRONT 

OXYGEN (A/F) 

SENSOR RH

5

6

7

4

2

1

3

B138

*

*

B1