Subaru 2009 IMPREZA Service Manual page 1493

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2 CHECK DRAIN HOSE.
Check the drain hose for clogging.
3 CHECK DRAIN VALVE OPERATION.
1) Turn the ignition switch to OFF.
2) Connect the delivery (test) mode connector
at the lower portion of instrument panel (on the
driver's side).
3) Turn the ignition switch to ON.
4) Operate the drain valve.
NOTE:
Drain valve can be operated using the Subaru
Select Monitor. For the procedures, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(H4DOTC)(diag)-55, Compulsory
Valve Operation Check Mode.>
Check
Is there clogging in the drain
hose?
Does the drain valve operate? Repair the poor
EN(H4DOTC)(diag)-272
Yes No
Check the appropri- Go to step 2.
ate DTC using the
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4DOTC)(diag)
-83, List of Diagnos-
tic Trouble Code
(DTC).>
Replace the drain Go to step 3.
hose.
Replace the drain
contact of ECM valve. <Ref. to
connector. EC(H4DOTC)-22,
Drain Valve.>