Subaru 2009 IMPREZA Service Manual page 1532

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
oil flow control solenoid valve.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 15 (+) — Chassis ground (–):
(B137) No. 14 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE CON-
NECTOR.
Measure the resistance of harness between
ECM and oil flow control solenoid valve connec-
tor.
Connector & terminal
(B137) No. 15 — (E37) No. 1:
(B137) No. 14 — (E37) No. 2:
3 CHECK OIL FLOW CONTROL SOLENOID
VALVE.
Measure the resistance between oil flow control
solenoid valve terminals.
Terminals
No. 1 — No. 2:
DM:DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN (BANK 1)
Refer to DTC P2097 for diagnostic procedure. <Ref. to EN(H4DOTC)(diag)-312, DTC P2097 POST CATA-
LYST FUEL TRIM SYSTEM TOO RICH (BANK 1), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
Check
Is the voltage less than 1 V?
Is the resistance less than 1 ? Go to step 3.
Is the resistance 6 — 12 ?
EN(H4DOTC)(diag)-311
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Repair the short
circuit to power in
harness between
ECM and oil flow
control solenoid
valve connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and oil flow
control
valve connector
• Poor contact of
coupling connector
Repair the poor Replace the oil
contact of ECM flow control sole-
and oil flow control noid valve. <Ref. to
solenoid valve con- ME(H4DOTC)-61,
nector. Camshaft.>
solenoid