Secondary Air Injection System

My air injector pump whines very loudly on startup for about 30 sec. It will also act up during driving for 10 sec intervals. I had it replaced in March and it was fine until November. It keeps throwing the Po410 engine malfunction code. What could be causing this recurring problem? Did I fix the wrong part? Car runs well, but the whine is frustrating and embarrassing. HELP!.......Please.

Here, read through this thread it may help you:

http://www.automotiveforums.com/vbulletin/showthread.php?t=924974