Subaru 2009 IMPREZA Service Manual page 531

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND OIL
SWITCHING SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and oil switching solenoid valve.
3) Measure the resistance between ECM and
oil switching solenoid valve.
Connector & terminal
(B137) No. 31 — (E68) No. 1:
(B137) No. 30 — (E68) No. 2:
2 CHECK HARNESS BETWEEN ECM AND OIL
SWITCHING SOLENOID VALVE.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B137) No. 31 — Chassis ground:
(B137) No. 30 — Chassis ground:
3 CHECK OIL SWITCHING SOLENOID VALVE.
Measure the resistance between oil switching
solenoid valve terminals.
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 resistance 6 — 12 ?
EN(H4SO)(diag)-114
Yes No
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
switching solenoid
valve connector
• Poor contact of
coupling connector
Go to step 3. Repair the ground
short circuit of har-
ness between
ECM and oil
switching solenoid
valve connector.
Repair the poor Replace the oil
contact of ECM switching solenoid
and oil switching valve. <Ref. to
solenoid valve con- ME(H4SO)-93, Oil
nector. Switching Solenoid
Valve.>
and oil