o.k., went to the junkyard & found a pathfinder with a vg30 engine like mine, i could not tell what year, but it was a first. gen. this ECU has a '53' stamped on top, mine has a '10'. connections look dry, so i try to start the truck, & nothing. I try to check codes on this junkyard ECU<, & it doesn't light up at all, it is just totally dead? I put my old one back in, & the same codes-- 3 green flashes, a long puse, & then 1 red flash. So my question is, did i just happen to pick a dead ECU? do the numbers (53 vs. 10) mean anything? also, this truck was an automatic, mine is a stick-- does that matter? sorry for the rambling, but my frustration is rising. thanks again for any input