Subaru Legacy (2005 year). Service manual — part 471

EN(H6DO)(diag)-197

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?

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
Code (DTC).>

Go to step 2.

2

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

Connector & terminal

(E73) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery

short circuit
between main
relay connector
and camshaft
position sensor
connector.

Go to step 3.

3

CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between camshaft
position sensor connector and engine ground.

Connector & terminal

(E73) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 4.

Repair the open or
battery short cir-
cuit between main
relay connector
and camshaft
position sensor
connector.

4

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

Connector & terminal

(E73) No. 2 — (B135) No. 9:
(E73) No. 3 — (B136) No. 35:

Is the resistance less than 1
Ω?

Go to step 5.

Repair the open
circuit between
camshaft position
sensor and ECM.

5

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

Connector & terminal

(E73) No. 2 — Engine ground:

Is the resistance more than 1
M

Ω?

Go to step 6.

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

6

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.

Is the camshaft position sensor
installation bolt tightened
securely?

Go to step 7.

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

7

CHECK CAMSHAFT POSITION SENSOR.
Check waveform of 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)-19,
Crankshaft Posi-
tion Sensor.>

Go to step 8.

8

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM
connector?

Repair the poor
contact in ECM
connector.

Replace the ECM.
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>

EN(H6DO)(diag)-198

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Engine stalls.
• Failure of engine to start

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-03501

B47

E

E2

B21

3

C35

SBF-7

E74

E1

B20

2

E73

B21

E2

1

19

3

B9

*

*

B83

2

1

ECM

B136

B135

B:

C:

48

1

3

4

1

2

5

6

B20

E74

B47

1 2 3

1 2 3 4
5 6 7 8

B83

B136

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

35

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

E73

BATTERY

CAMSHAFT
POSITION
SENSOR RH

CAMSHAFT
POSITION
SENSOR LH

MAIN RELAY

B:

C:

2

B8

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

6
4

: TERMINAL No.
RANDOM ARRANGEMENT

*

1 2 3 4
5 6 7 8
9 10 11 12

14

13

15 16

EN(H6DO)(diag)-199

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?

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
Code (DTC).>

Go to step 2.

2

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

Connector & terminal

(E74) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery

short circuit
between main
relay connector
and camshaft
position sensor
connector.

Go to step 3.

3

CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between camshaft
position sensor connector and engine ground.

Connector & terminal

(E74) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 4.

Repair the open or
battery short cir-
cuit between main
relay connector
and camshaft
position sensor
connector.

4

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

Connector & terminal

(E74) No. 2 — (B135) No. 8:
(E74) No. 3 — (B136) No. 35:

Is the resistance less than 1
Ω?

Go to step 5.

Repair the open
circuit between
camshaft position
sensor and ECM.

5

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

Connector & terminal

(E74) No. 2 — Engine ground:

Is the resistance more than 1
M

Ω?

Go to step 6.

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

6

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.

Is the camshaft position sensor
installation bolt tightened
securely?

Go to step 7.

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

7

CHECK CAMSHAFT POSITION SENSOR.
Check waveform of 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)-20,
Camshaft Position
Sensor.>

Go to step 8.

8

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM
connector?

Repair the poor
contact in ECM
connector.

Replace the ECM.
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>

EN(H6DO)(diag)-200

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BM:DTC P0400 EXHAUST GAS RECIRCULATION FLOW

DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
TROUBLE SYMPTOM:
• Movement performance problem when engine is low speed.
• Erroneous idling
• Movement performance problem

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-03502

E

B47

E18

2

5

1

4

3

6

B21

E2

E76

E77

48

3

10

9

11

8

4

7

6

SBF-7

BATTERY

MAIN RELAY

EGR

VALVE

B134

ECM

B47

3

4

1

2

5

6

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

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

6
4