How do you know if you have a bad ecu?

when you've checked everything else and its all good

other trick is to find a known good ecu of the same year and plug it in, if the car runs your old ecu is toast

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!