Subaru Legacy IV (2008 year). Service manual — part 146

EN(H4SO)(diag)-187

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK CONDITION OF CRANKSHAFT PO-
SITION SENSOR.
Turn the ignition switch to OFF.

Is the crankshaft position sen-
sor installation bolt tightened
securely?

Go to step 2.

Tighten the crank-
shaft position sen-
sor installation bolt
securely.

2

CHECK CRANK SPROCKET.
Remove the timing belt cover.

Are crank sprocket teeth
cracked or damaged?

Replace the crank
sprocket. <Ref. to
ME(H4SO)-50,
Crank Sprocket.>

Go to step 3.

3

CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cylin-
der block.

Is the timing belt dislocated
from its proper position?

Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4SO)-44,
Timing Belt.>

Replace the crank-
shaft position sen-
sor. <Ref. to
FU(H4SO)-23,
Crankshaft Posi-
tion Sensor.>

EN(H4SO)(diag)-188

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

BB:DTC P0340 CAMSHAFT POSITION SENSOR “A” CIRCUIT (BANK 1 OR SINGLE

SENSOR)

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-92, DTC P0340 CAMSHAFT POSITION SENSOR “A”
CIRCUIT (BANK 1 OR SINGLE SENSOR), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Failure of engine to start

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-04040

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

E15

1

2

13

12

22

24

B21

E2

E15

B134 ECM

12

E

CAMSHAFT

POSITION

SENSOR

1 2

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

EN(H4SO)(diag)-189

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
camshaft position sensor.
3) Measure the resistance of harness between
ECM and camshaft position sensor connector.

Connector & terminal

(B134) No. 12 — (E15) No. 1:
(B134) No. 22 — (E15) 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 in
harness between
the ECM and cam-
shaft position sen-
sor connector
• Poor contact in
ECM connector
• Poor contact of
coupling connector

2

CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR.
Measure the resistance between camshaft
position sensor connector and engine ground.

Connector & terminal

(E15) No. 1 — Engine ground:

Is the resistance 1 M

: or

more?

Go to step 3.

Repair the short
circuit to ground in
harness between
ECM and camshaft
position sensor.

NOTE:
The harness be-
tween both con-
nectors are
shielded. Remove
the shield and re-
pair the ground
short circuit of the
harness circuit.

3

CHECK INSTALLATION CONDITION OF
CAMSHAFT POSITION SENSOR.

Is the camshaft position sensor
installation bolt tightened
securely?

Go to step 4.

Tighten the cam-
shaft position sen-
sor installation bolt
securely.

4

CHECK CAMSHAFT POSITION SENSOR.
1) Remove the camshaft position sensor.
2) Measure the resistance between connector
terminals of camshaft position sensor.

Terminals

No. 1 — No. 2:

Is the resistance between 1 and
4 k

:?

Repair the poor
contact of ECM or
camshaft position
sensor connector.

Replace the cam-
shaft position sen-
sor. <Ref. to
FU(H4SO)-24,
Camshaft Position
Sensor.>

EN(H4SO)(diag)-190

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

BC:DTC P0341 CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/

PERFORMANCE (BANK 1 OR SINGLE SENSOR)

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-94, DTC P0341 CAMSHAFT POSITION SENSOR “A”
CIRCUIT RANGE/PERFORMANCE (BANK 1 OR SINGLE SENSOR), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Failure of engine to start

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-04040

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

E15

1

2

13

12

22

24

B21

E2

E15

B134 ECM

12

E

CAMSHAFT

POSITION

SENSOR

1 2

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