d15bfi

Hey guys i seem to be getting a cel code 16. I am assuming by the research i have done its the main relay but i want to be 100% sure on this that its not the fuel pump or injectors dirty or short in wiring or something like that. Is there a way to figure this out other than replacing the relay? It doesn't seem to not want to start or anything but it comes on after warmed up, clear it in hondata and it comes back after a bit.