Subaru Legacy III (2000-2003 year). Service 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
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.
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
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.
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).>
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
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.
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
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.
Tighten camshaft
position sensor
installation bolt
securely.
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