heres a diagram for ya

 

i got the code P0411 then i got p2431 secondary air injection system air flow.
I believe it means the electric air pump is faulty and needs to be replaced? am i right? if so can someone please tell me or send me a pic as to where this pump is located on my 06 trailblazer.

I'm just a girl trying to fix her truck by myself cuz i can't a afford a mechanic.

Am i in the right track here boys?

Daniela