Subaru 2009 IMPREZA Service Manual page 643

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 29 (+) — Chassis ground (–):
2 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
Check
Is the voltage 10 V or more?
Is the resistance less than 1 ? Replace the purge
EN(H4SO)(diag)-226
Yes No
Repair the short Go to step 2.
circuit to power in
the harness
between ECM and
purge control sole-
noid valve connec-
tor.
Repair the poor
control solenoid contact of ECM
valve. <Ref. to connector.
EC(H4SO)-9,
Purge Control
Solenoid Valve.>