Subaru Legacy (2005 year). Manual — part 479

EN(H6DO)(diag)-229

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CP:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

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.

EN-03490

BATTERY

IGNITION
SWITCH

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

B72

B6

B5

D16

A6

D2

A7

B12

D3

D7

D1

B19

D14

No.12

B47

E2

B21

ECM

E

E

3

6

B134

B135

A:

D: B137

B:

B4

52

37

36

34

12

3

4

1

2

5

6

B47

No.13

B1

35

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

B135

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

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

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

B72

1

3

4 5 6

2

A:

B:

D:

SBF-5

A4

A5

54

3
5

6
4

1
2

TO OXYGEN SENSOR

EN(H6DO)(diag)-230

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

Step

Check

Yes

No

EN(H6DO)(diag)-231

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CQ: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, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-02514

B21

E2

B134

E67

28

2

1

24

23

E67

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

EN(H6DO)(diag)-232

ENGINE (DIAGNOSTICS)

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 resistance between ECM and
oil flow control solenoid valve.

Connector & terminal

(B134) No. 18 — (E67) No. 1:
(B134) No. 28 — (E67) No. 2:

Is the resistance less than 1
Ω?

Go to step 2.

Repair the open
circuit of harness
between ECM and
oil flow control
solenoid valve
connector.

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

2

CHECK OIL FLOW CONTROL SOLENOID
VALVE.
1) Remove the oil flow control solenoid valve
connector.
2) Measure the resistance between oil flow
control solenoid valve terminals.

Terminal

No. 1 — No. 2:

Is the resistance 6 — 12

Ω?

Repair the poor
contact in ECM
and oil flow con-
trol solenoid valve.

Replace the oil
flow control sole-
noid valve. <Ref.
to ME(H6DO)-79,
Oil Flow Control
Solenoid Valve.>