Subaru LEGACY 2006 Manual page 135

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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 connector from 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 OIL SWITCHING SOLENOID VALVE.
1) Remove the oil switching solenoid valve
connector.
2) Measure the resistance between oil switch-
ing solenoid valve terminals.
Terminals
No. 1 — No. 2:
Check
Is the resistance less than 1
Ω?
Is the resistance between 6
and 12 Ω?
EN(H4SO)(diag)-98
Yes No
Go to step 2. Repair the open
circuit of harness
between ECM and
oil switching sole-
noid valve connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and oil switch-
ing solenoid valve
connector
• Poor contact of
coupling connector
Repair the poor Replace the oil
contact of ECM switching solenoid
and oil switching valve. <Ref. to
solenoid valve. ME(H4SO)-83, Oil
Switching Sole-
noid Valve.>