91 sidekick 4dr 4x4 16v 1.6l manual transmission (mpi)
Roger. Thanks. Is there anywhere you would start first? Short of replacing every wire on that 5v ref circuit.
find the ref wire at the ecm and remove it from the plug, then probe the pin the wire was connected to to confirm ecm is outputting 5V with key on, then work out from there. If there's a short on the ref line anywhere, the voltage will drop to 0V at the ecm.Bex,
I don’t get 5v at back of ecu on the ref wire with the tps unhooked or hookedSo I assume it’s one of the other wires getting cross feed with 12v and shorting it out like gv said
So you are saying that you DO have the 5v reference coming directly out of the ECU. So, your issue is somewhere in the harness wiring, presumably.Also....
One more. I backprobed every pin on the ecu and checked it against the fsm and they all read good. If I was getting 12v somewhere I shouldn’t because of a chaffed wire shouldn’t I have seen something out of whack somewhere? Too high a voltage on one of the ref lines??