I have a 99 SE Limited and i wanted to try the self diagnosis, so i get to the ECU and the dial says "ENGINE IDLE SPEED" Why Doesnt it say self diagnosis???? Correct me if i'm wrong..but isnt the dial on the side of the ECU suppost to be for the self diagnosis??? Thanx!

 

is it a screw for a flat head? if it is .. stick the flat head in it and read the code

 

it's flat head...but the label says..ENGINE IDLE SPEED i dont know if i wanna mess with that??