Subaru Legacy (2005 year). Service 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.