Subaru Legacy 2004 Service Manual page 581

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from camshaft
position sensor.
3) Measure the resistance of harness
between camshaft position sensor connector
and engine ground.
Connector & terminal
(E15) No. 1 — Engine ground:
2 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure the resistance of harness between
camshaft position sensor connector and
engine ground.
Connector & terminal
(E15) No. 1 — Engine ground:
3 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR AND ECM CONNEC-
TOR.
Measure the resistance of harness between
camshaft position sensor connector and
engine ground.
Connector & terminal
(E15) No. 2 — Engine ground:
4 CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
5 CHECK CAMSHAFT POSITION SENSOR.
1) Remove the camshaft position sensor.
2) Measure the resistance between connector
terminals of camshaft position sensor.
Terminals
No. 1 — No. 2:
Check
Is the resistance more than
100 k&?
Is the resistance less than 10
&?
Is the resistance less than 5
&?
Is the camshaft position sensor
installation bolt tightened
securely?
Is the resistance 1 — 4 k&?
EN(H4SO 2.0)(diag)-149
ENGINE (DIAGNOSTICS)
Yes
Repair the har- Go to step 2.
ness and connec-
tor.
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 the 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
the ground short
circuit in harness
with shield.
Go to step 4. Repair the har-
ness and connec-
tor.
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 the cam-
shaft position sen-
sor installation bolt
securely.
Repair the poor Replace the cam-
contact in cam- shaft position sen-
shaft position sen- sor. <Ref. to
sor connector. FU(H4SO 2.0)-22,
Camshaft Position
Sensor.>
No