Hello Haynes it's been a while since I posted here! As I mentioned in a previous post I purchased an '01 Chevy S10 a few months ago! The service engine soon light has been coming on the last month or so, I pulled up the codes and got a P0410 which is for the secondary air injection system. I replaced the secondary air/smog pump and cleared the codes. A couple days later the light came on again still throwing out P0410. I checked the 30 amp maxi fuse on the passenger side fender well by the battery using my digital multimeter and it's getting continuity. I checked the smog pump this morning when I first started the truck and it didn't seem to be running. Could it be the relay? If so how do I check it? Please help!