Sorry, I can't paste the wiring diagram here, but here is part of what the shop manual says:
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
TC P0244 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A”
DTC DETECTING CONDITION:
• Immediately at fault recognition
SOLENOID “A” RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>
• Erroneous idling
• Engine stalls.
• Poor driving performance
After repair or replacement of faulty parts, conduct Clear Memory Mode
1 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the relevant
“List of Diagnostic
BTW, you can access many shop manuals at Impreza Manuals | ken-gilbert.com
newest available is '06 I believe. That's where I got the above info.
Anyway, if it is running and boosting OK, then no need to do anything and see if the code comes back. If not, sounds you'll need to replace the boost control solenoid. Should be about $110 from the dealer