Subaru IMPREZA GD 2007 Series Manual page 289

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and camshaft position sensor.
3) Measure the resistance of harness between
the ECM and camshaft position sensor connec-
tor.
Connector & terminal
(B134) No. 12 — (E15) No. 1:
(B134) No. 22 — (E15) No. 2:
2 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR.
Measure the resistance between camshaft
position sensor connector and engine ground.
Connector & terminal
(E15) No. 1 — Engine ground:
3 CHECK INSTALLATION CONDITION OF
CAMSHAFT POSITION SENSOR.
4 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 less than 1 Ω? Go to step 2.
Is the resistance 1 MΩ or
more?
Is the camshaft position sensor
installation bolt tightened
securely?
Is the resistance between 1 —
4 kΩ?
EN(H4SO)(diag)-180
Yes No
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
the harness be-
tween the ECM
and camshaft posi-
tion sensor
• Poor contact in
ECM connector
• Poor contact of
coupling connector
Go to step 3.
Repair short cir-
cuit of the harness
to ground between
the ECM and cam-
shaft position sen-
sor.
NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
short circuit of the
harness to ground
with shield.
Go to step 4. Tighten the cam-
shaft position sen-
sor installation bolt
securely.
Repair the poor Replace the cam-
contact of the ECM shaft position sen-
or camshaft posi- sor. <Ref. to
tion sensor con- FU(H4SO)-24,
nector. Camshaft Position
Sensor.>