Just put new battery plus engine works fine

"Won't start" can mean a lot of different things, but since you replaced the battery, my guess is the engine cranks normally but doesn't start and run. Try holding the gas pedal down 1/4". When that works, go out and drive it with two feet on the pedals. Drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. That will meet the conditions for the Engine Computer to relearn "minimum throttle". Once that is done, it will know when it has to be in control of idle speed.