Well, if the ugly one works and the other two do not, then the problem is two of your ecu's are bad and it isn't the one that's ugly.

I would look at the 5 pin connector and make sure the female connections are not loose on the ecu pins, if not then the ecu is bad.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.