Subaru Legacy (2005 year). Manual - part 342

EN(H4DOTC)(diag)-137

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(H4DOTC)(diag
)-62, 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

(E35) 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

(E35) No. 1 (+) — Engine ground (

−

):

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

Repair the open or 
ground 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

(E35) No. 2 — (B135) No. 8:
(E35) 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

(E35) 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(H4DOTC)(diag)-15, Engine Con-
trol Module (ECM) I/O Signal.>

Is there any abnormality in 
waveform?

Replace the cam-
shaft position sen-
sor. <Ref. to 
FU(H4DOTC)-24, 
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(H4DOTC)-34, 
Engine Control 
Module (ECM).>

EN(H4DOTC)(diag)-138

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AJ:DTC P0350 IGNITION COIL PRIMARY/SECONDARY CIRCUIT

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Engine stalls.
• Idle mixture is out of specifications.

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.

EN(H4DOTC)(diag)-139

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

EN-03520

SBF-6

MAIN SBF

B72

B135

18

17

16

15

ECM

No.12

E

E

6

3

E2

B21

E31

E31

E32

E33

E34

No.1

E32

E33

E34

1
2
3

B21

3

1

2

3

1

2

13

49

14

15

16

3

1

2

3

1

2

IGNITION
SWITCH

IGNITION COIL

No.2

IGNITION COIL

No.3

IGNITION COIL

No.4

IGNITION COIL

B135

B72

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

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

1

3

4 5 6

2

EN(H4DOTC)(diag)-140

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK POWER SUPPLY CIRCUIT OF IGNI-
TION COIL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition coil.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between 
ignition coil connector and engine ground.

Connector & terminal

(E31) No. 3 (+) — Engine ground (

−

):

(E32) No. 3 (+) — Engine ground (

−

):

(E33) No. 3 (+) — Engine ground (

−

):

(E34) No. 3 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 2.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ignition coil and 
ignition switch con-
nector
• Poor contact in 
coupling connector

2

CHECK HARNESS OF ECM AND IGNITION 
COIL GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ignition 
coil connector and engine ground.

Connector & terminal

(E31) No. 2 — Engine ground:
(E32) No. 2 — Engine ground:
(E33) No. 2 — Engine ground:
(E34) No. 2 — Engine ground:

Is the resistance less than 5 
Ω?

Go to step 3.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ignition coil con-
nector and engine 
ground terminal
• Poor contact in 
coupling connector

3

CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
1) Disconnect the connector from ignition coil.
2) Measure the resistance of harness 
between ECM and ignition coil connector.

Connector & terminal

(B135) No. 18 — (E31) No. 1:
(B135) No. 17 — (E32) No. 1:
(B135) No. 16 — (E33) No. 1:
(B135) No. 15 — (E34) No. 1:

Is the resistance less than 1 
Ω?

Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ECM and ignition 
coil connector
• Poor contact in 
coupling connector

4

CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
Measure the resistance of harness between 
ignition coil connector and engine ground.

Connector & terminal:

(E31) No. 1 — Engine ground:
(E32) No. 1 — Engine ground:
(E32) No. 1 — Engine ground:
(E34) No. 1 — Engine ground:

Is the resistance more than 1 
M

Ω?

Repair the poor 
contact in terminal.

Repair the har-
ness and connec-
tor.