Depending on the age of the Atom it could be one of the early units that did have injector drives more prone to failure. But generally when the drives failed they wend to a short to ground causing the injector to be stuck on. I would certainly confirm all the loom is 100%. Swapping over to the second ECU will be a big step to proving this. Just make sure there is no short to 12V on that drive before connecting the replacement unit.
rudy shahrin reacted to Simon in 3ur-fe tundra 5.7 injector problems
