Subaru Legacy IV (2008 year). Manual - part 564

EN(H6DO)(diag)-229

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

(E73) 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 — (E73) No. 2:
(B134) No. 22 — (E73) 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 in
harness between
the ECM and cam-
shaft position sen-
sor connector
• 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

(E73) No. 2 — Engine ground:

Is the resistance 1 M

: or 

more?

Go to step 4.

Repair short cir-
cuit to ground in 
harness between 
ECM and camshaft 
position sensor 
connector.

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

(E73) No. 2 (+) — Engine ground (–):

Is the voltage 5 V or more?

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

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(H6DO)(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(H6DO)-22,
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(H6DO)(diag)-230

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

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

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-102, 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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-06876

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

E2

B21

3

22

SBF-7

E74

E1

B20

E73

1

3

11

2

1

ECM

B134

1

3

4

1

2

5

6

B20

E74

B47

1 2 3

B134

E73

BATTERY

MAIN RELAY

2

21

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

2

6

48

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

CAMSHAFT

POSITION

SENSOR LH

CAMSHAFT

POSITION

SENSOR RH

EN(H6DO)(diag)-231

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

(E74) 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 — (E74) No. 2:
(B134) No. 22 — (E74) 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 in
harness between
the ECM and cam-
shaft position sen-
sor connector
• 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

(E74) No. 21 — Engine ground:

Is the resistance 1 M

: or 

more?

Go to step 4.

Repair short cir-
cuit to ground in 
harness between 
ECM and camshaft 
position sensor 
connector.

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

(E74) No. 21 (+) — Engine ground (–):

Is the voltage 5 V or more?

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

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(H6DO)(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(H6DO)-22,
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(H6DO)(diag)-232

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CB:DTC P0400 EXHAUST GAS RECIRCULATION FLOW

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-103, DTC P0400 EXHAUST GAS RECIRCULATION
FLOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Movement performance problem when engine is low speed.
• Improper idling
• Movement performance problem

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:

E

B47

E18

2

5

1

4

3

6

B21

E2

E76

E77

48

3

4

7

6

SBF-7

B134

ECM

B47

3

4

1

2

5

6

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

10

E76

E77

21

32

33

22

B21

E2

E18

1

3

4 5 6

2

1 2

3 4

5

6

7

8

9

10

E77

MAIN RELAY

BATTERY

EGR VALVE

6
4

9

10

8

20

EN-06877

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