Subaru Legacy 2003 Service Manual page 582

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
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?
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?
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?
4 CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
Is the camshaft position sensor installation bolt
tightened 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?
Value
100 kΩ
10 Ω
5 Ω
Tightened securely.
1 - 4 kΩ
EN(H4SO)-185
ENGINE (DIAGNOSTICS)
Yes
Repair harness Go to step 2.
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
Repair ground Go to step 3.
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. 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 5. Tighten camshaft
position sensor
installation bolt
securely.
Repair poor con- Replace camshaft
tact in camshaft position sensor.
position sensor <Ref. to
connector. FU(H4SO)-28,
Camshaft Position
Sensor.>
No