Re: 2002 Escape electrical
Frankly, I don't know why it stayed running with the battery disconnected. Before the vehicles had computers, that would happen but I always thought that can't now because everything is powered from the 12V battery. I could very well be wrong too.
Your PCM has KAL(Keep Alive Memory) that's always powered but the battery must be connected. That's why they sell these adapters that keep the PCM powered when you replace the 12V battey, I have one that uses the OBD-II port. I've had a battery short out, radio went crazy, power door locks were cycling, etc.
You may have fried your PCM!
'09 Ford Escape Limited, V6, 4WD