I have a 2001 Chevy Blazer, I've had a service engine light for a short time and I decided to take care of it today. Had two codes, the first I fixed and the second was the P0410 "Secondary Air Injection Failure". I checked the 30 amp fuse, it was not blown, I then started the truck and put my hand on the air pump and it was operating. Any ideas on what else I can check?

Clear the code and see if it comes back.