Subaru Legacy IV (2008 year). Manual - part 341

EN(H4DOTC)(diag)-185

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

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

SENSOR)

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-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(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-05677

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

B47

1

2

4

6

3

5

E

3

22

SBF-7

E35

E2

B21

2

E36

1

3

11

2

1

B134

3

4

1

2

5

6

E36

B47

1 2 3

B134

E35

21

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

5

48

2

13

MAIN RELAY

BATTERY

INTAKE

CAMSHAFT
POSITION
SENSOR LH

INTAKE

CAMSHAFT
POSITION
SENSOR RH

ECM

EN(H4DOTC)(diag)-186

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POWER SUPPLY OF CAMSHAFT 
POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the cam-
shaft position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between camshaft 
position sensor connector and engine ground.

Connector & terminal

(E36) No. 1 (+) — Engine ground (–):

Is the voltage 10 V or more?

Go to step 2.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit or
short circuit to
ground in harness
between main re-
lay connector and
camshaft position
sensor connector
• Poor contact of
coupling connector

2

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

Connector & terminal

(B134) No. 11 — (E36) No. 2:
(B134) No. 22 — (E36) No. 3:

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 camshaft posi-
tion sensor
• Poor contact of
coupling connector

3

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

Connector & terminal

(E36) No. 2 — Engine ground:

Is the resistance 1 M

: or 

more?

Go to step 4.

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

4

CHECK HARNESS BETWEEN ECM AND 
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the voltage between camshaft posi-
tion sensor connector and engine ground.

Connector & terminal

(E36) No. 2 (+) — Engine ground (–):

Is the voltage 5 V or more?

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

Go to step 5.

5

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.

Is the camshaft position sensor 
installation bolt tightened 
securely?

Go to step 6.

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

6

CHECK CAMSHAFT POSITION SENSOR.
Check the waveform of the camshaft position 
sensor. <Ref. to EN(H4DOTC)(diag)-17, 
Engine Control Module (ECM) I/O Signal.>

Is there any abnormality in 
waveform?

Replace the cam-
shaft position sen-
sor. <Ref. to 
FU(H4DOTC)-33, 
Camshaft Position 
Sensor.>

Repair the follow-
ing item.
• Poor contact in 
ECM connector
• Poor contact of 
camshaft position 
sensor connector
• Poor contact of 
coupling connector

EN(H4DOTC)(diag)-187

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

BB:DTC P0345 CAMSHAFT POSITION SENSOR “A” CIRCUIT (BANK 2)

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-93, DTC P0345 CAMSHAFT POSITION SENSOR “A”
CIRCUIT (BANK 2), 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(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-05677

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

B47

1

2

4

6

3

5

E

3

22

SBF-7

E35

E2

B21

2

E36

1

3

11

2

1

B134

3

4

1

2

5

6

E36

B47

1 2 3

B134

E35

21

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

5

48

2

13

MAIN RELAY

BATTERY

INTAKE

CAMSHAFT
POSITION
SENSOR LH

INTAKE

CAMSHAFT
POSITION
SENSOR RH

ECM

EN(H4DOTC)(diag)-188

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POWER SUPPLY OF CAMSHAFT 
POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the cam-
shaft position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between camshaft 
position sensor connector and engine ground.

Connector & terminal

(E35) No. 1 (+) — Engine ground (–):

Is the voltage 10 V or more?

Go to step 2.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit or
short circuit to
ground in harness
between main re-
lay connector and
camshaft position
sensor connector
• Poor contact of
coupling connector

2

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

Connector & terminal

(B134) No. 21 — (E35) No. 2:
(B134) No. 22 — (E35) No. 3:

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 camshaft posi-
tion sensor
• Poor contact of
coupling connector

3

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

Connector & terminal

(E35) No. 2 — Engine ground:

Is the resistance 1 M

: or 

more?

Go to step 4.

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

4

CHECK HARNESS BETWEEN ECM AND 
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the voltage between camshaft posi-
tion sensor connector and engine ground.

Connector & terminal

(E35) No. 2 (+) — Engine ground (–):

Is the voltage 5 V or more?

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

Go to step 5.

5

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.

Is the camshaft position sensor 
installation bolt tightened 
securely?

Go to step 6.

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

6

CHECK CAMSHAFT POSITION SENSOR.
Check the waveform of the camshaft position 
sensor. <Ref. to EN(H4DOTC)(diag)-17, 
Engine Control Module (ECM) I/O Signal.>

Is there any abnormality in 
waveform?

Replace the cam-
shaft position sen-
sor. <Ref. to 
FU(H4DOTC)-33, 
Camshaft Position 
Sensor.>

Repair the follow-
ing item.
• Poor contact in 
ECM connector
• Poor contact of 
camshaft position 
sensor connector
• Poor contact of 
coupling connector