Subaru 2009 IMPREZA Service Manual page 612

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
camshaft position sensor.
3) Measure the resistance of harness between
ECM and camshaft position sensor connector.
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 terminals
of camshaft position sensor.
Terminals
No. 1 — No. 2:
Check
Is the resistance less than 1 ? Go to step 2.
Is the resistance 1 M or
more?
Is the camshaft position sensor
installation bolt tightened
securely?
Is the resistance between 1 and
4 k ?
EN(H4SO)(diag)-195
ENGINE (DIAGNOSTICS)
Yes No
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and camshaft
position
connector
• Poor contact of
ECM connector
• Poor contact of
coupling connector
Go to step 3. Repair the short
circuit to ground in
harness between
ECM and camshaft
position sensor.
NOTE:
The harness be-
tween both con-
nectors
shielded. Remove
the shield and re-
pair the
short circuit of the
harness circuit.
Go to step 4. Tighten the cam-
shaft position sen-
sor installation bolt
securely.
Repair the poor Replace the cam-
contact of ECM or shaft position sen-
camshaft position sor. <Ref. to
sensor connector. FU(H4SO)-28,
Camshaft Position
Sensor.>
sensor
are
ground