Subaru Legacy (2005 year). Manual - part 349

EN(H4DOTC)(diag)-165

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check DTC using 
“List of Diagnostic 
Trouble Code 
(DTC)”. <Ref. to 
EN(H4DOTC)(diag
)-62, List of Diag-
nostic Trouble 
Code (DTC).>

Go to step 2.

2

CHECK HARNESS BETWEEN STARTER 
RELAY AND ECM.
1) Disconnect the connectors from starter 
relay and ECM.
2) Measure the resistance of harness 
between ECM and chassis ground.

Connector & terminal

(B135) No. 32 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Repair the ground 
short circuit 
between starter 
motor and ECM.

Repair the poor 
contact in ECM 
connector.

EN(H4DOTC)(diag)-166

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BD:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03519

B72

BATTERY

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

No.13

SBF-5

B72

TO FRONT OXYGEN(A/F) SENSOR

D16

A6

A7

B1

B4

D7

B12

D1

D2

D3

B5

B6

B19

D14

No.12

B47

E2

B21

2

1

4

6

5

3

ECM

E

E

3

6

B134

B135

B137

A:

B:

D:

54

35

36

12

34

3

4

1

2

5

6

B47

B21

B134

A:

B137

D:

B135

B:

IGNITION
SWITCH

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

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

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

37

1

3

4 5 6

2

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

EN(H4DOTC)(diag)-167

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B135) No. 19 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Repair the poor 

contact in ECM 
connector.

Go to step 2.

2

CHECK HARNESS BETWEEN ECM AND 
MAIN FUSE BOX CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness 
between ECM and chassis ground.

Connector & terminal

(B135) No. 19 — Chassis ground:

Is the resistance less than 10 
Ω?

Repair the ground 
short circuit of har-
ness between 
ECM connector 
and battery termi-
nal.

Go to step 3.

3

CHECK FUSE No. 13.

Is the fuse blown out?

Replace the fuse.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ECM and battery
• Poor contact in 
ECM connector
• Poor contact in 
battery terminal

EN(H4DOTC)(diag)-168

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BE:DTC P2088 INTAKE CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT 

LOW (BANK 1)

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-01960

B21

E2

B134

E38

28

2

1

24

23

E38

B21

1 2

18

B134

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

ECM

OIL FLOW CONTROL 

SOLENOID VALVE RH

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