At the moment, don't worry about the 31. It will show up if there is no solenoid plugged in.
Tell us how your boost is being controlled? You stated you have the factory Y hosing.
One leg should go to the compressor housing, one to the actuator, and the third leg should go to the wastegate solenoid. You have no solenoid, so where does the third leg go? Is there a bleed valve attatched to it? Or what?
