Subaru Legacy III (2000-2003 year). Manual - part 143

EN(H4SO)-184

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

AK:DTC P0340 — CAMSHAFT POSITION SENSOR “A” CIRCUIT (BANK 1 OR 

SINGLE SENSOR) —

• 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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection 
Mode.> .
• WIRING DIAGRAM:

EN-01128

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

B135

B21

E15

1 2

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

1

2

20

18

18

7

28

B21

E2

E15

B135 ECM

CAMSHAFT

POSITION

SENSOR

EN(H4SO)-185

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from camshaft posi-

tion sensor.

3) Measure resistance of harness between 

camshaft position sensor connector and 
engine ground.

Connector & terminal

(E15) No. 1 — Engine ground:

Does the measured value exceed the spec-
ified value?

100 k

Ω

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
camshaft position 
sensor and ECM 
connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

Go to step 2.

2

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure resistance of harness between cam-
shaft position sensor connector and engine 
ground.

Connector & terminal

(E15) No. 1 — Engine ground:

Is the measured value less than the specified 
value?

10 

Ω

Repair ground 
short circuit in har-
ness between 
camshaft position 
sensor and ECM 
connector.

NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
ground short circuit
in harness togeth-
er with shield.

Go to step 3.

3

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure resistance of harness between cam-
shaft position sensor connector and engine 
ground.

Connector & terminal

(E15) No. 2 — Engine ground:

Is the measured value less than the specified 
value?

5 

Ω

Go to step 4.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
camshaft position 
sensor and ECM 
connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

4

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
Is the camshaft position sensor installation bolt 
tightened securely?

Tightened securely.

Go to step 5.

Tighten camshaft 
position sensor 
installation bolt 
securely.

5

CHECK CAMSHAFT POSITION SENSOR.
1) Remove camshaft position sensor.
2) Measure resistance between connector ter-

minals of camshaft position sensor.

Terminals

No. 1 — No. 2:

Is the measured value within the specified 
range?

1 - 4 k

Ω

Repair poor con-
tact in camshaft 
position sensor 
connector.

Replace camshaft 
position sensor.  
<Ref. to 
FU(H4SO)-28, 
Camshaft Position 
Sensor.>

EN(H4SO)-186

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

AL:DTC P0341 — CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PER-

FORMANCE (BANK 1 OR SINGLE SENSOR) —

• 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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection 
Mode.> .
• WIRING DIAGRAM:

EN-01128

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

B135

B21

E15

1 2

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

1

2

20

18

18

7

28

B21

E2

E15

B135 ECM

CAMSHAFT

POSITION

SENSOR

EN(H4SO)-187

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor or OBD-II 
general scan tool indicate DTC P0340?

DTC P0340 indicated.

Inspect DTC 
P0340 using “List 
of Diagnostic 
Trouble Code 
(DTC)”. <Ref. to 
EN(H4SO)-83, List 
of Diagnostic 
Trouble Code 
(DTC).>  

Go to step 2.

2

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from camshaft posi-

tion sensor.

3) Measure resistance of harness between 

camshaft position sensor connector and 
engine ground.

Connector & terminal

(E15) No. 1 — Engine ground:

Does the measured value exceed the spec-
ified value?

100 k

Ω

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
camshaft position 
sensor and ECM 
connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

Go to step 3.

3

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure resistance of harness between cam-
shaft position sensor connector and engine 
ground.

Connector & terminal

(E15) No. 1 — Engine ground:

Is the measured value less than the specified 
value?

10 

Ω

Repair ground 
short circuit in har-
ness between 
camshaft position 
sensor and ECM 
connector.

NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
ground short circuit
in harness togeth-
er with shield.

Go to step 4.

4

CHECK HARNESS BETWEEN CAMSHAFT 
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure resistance of harness between cam-
shaft position sensor connector and engine 
ground.

Connector & terminal

(E15) No. 2 — Engine ground:

Is the measured value less than the specified 
value?

5 

Ω

Go to step 5.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
camshaft position 
sensor and ECM 
connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

5

CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
Is the camshaft position sensor installation bolt 
tightened securely?

Tightened securely.

Go to step 6.

Tighten camshaft 
position sensor 
installation bolt 
securely.