penright 
My 06 GP with 94,000 miles threw a P0411 code, Issue with secondary air flow. I cleared it, drove the rest of the day. Drove to work the next day about 45 miles. Then when I went to lunch it came back. I just replaced a bad battery 3 days before the first code. I have done some searching on this forum and the web in general. I think I have a 30,000 foot picture of the system, but do have a few questions before I dig under the hood.
Here is my understanding of the system. I may be merging wrong make and years so correct me if wrong.
There is a electric air pump that pumps air through a one way check valve, through a control valve into the exhaust before O2 sensors. The air pump power is switched through a relay. The system self checks by commanding the pump on and control valve open and waiting for the O2 sensors to read the swing.
Questions:
1) Where is the relay? The 1 of 2 post I found on the forum the guy was looking for it. It sounded like he found it around where the air pump is, but some thought it was a relay in the fuse block.
2) Is there a check valve? My hose seems to run from the air pump to the control valve. Am I missing something?
3) When does/ What event causes the system self test? Cold or hot? Why did it work before a whole day before there was a problem?
4) Most of the write ups on the control valve was vacuum, mine looks electrically controlled. How can it be tested? I am assuming a solenoid, if so which pin fires it and when?
5) Is the battery thing a clue or coincidence?
