Yes. EEC-II (MCU) forward had a self-test. I don't think EEC-1 did but that controlled almost nothing anyway. The older it is, the more limited the code output but by 84 it was getting halfway useful.
10 is a spacer code between current and stored codes if thats an engine-off scan.
111 is all-clear, no codes.
guessing it did 111, 10, then the others? If so key on, engine off is good, space, then you have 3 history codes
172 is right side lean
176 is left side lean
542 is fuel pump circuit fail.
if those are history, I'd clear them and see if it comes back. If this previously had a fuel pump fuse or fuel pump relay failure it could explain all 3 of those codes. Fuel pump circuit monitors voltage being sent to the pump, not so much that the pump is working. Basically if it loses power you get the fault code. Losing power while driving will make everything go lean and the engine will die.
10 is a spacer code between current and stored codes if thats an engine-off scan.
111 is all-clear, no codes.
guessing it did 111, 10, then the others? If so key on, engine off is good, space, then you have 3 history codes
172 is right side lean
176 is left side lean
542 is fuel pump circuit fail.
if those are history, I'd clear them and see if it comes back. If this previously had a fuel pump fuse or fuel pump relay failure it could explain all 3 of those codes. Fuel pump circuit monitors voltage being sent to the pump, not so much that the pump is working. Basically if it loses power you get the fault code. Losing power while driving will make everything go lean and the engine will die.
Comment