Two good videos about Ford's Electronic Throttle Body. The first explains the source of the failure and the second explains how to perform the Throttle Body Relearn Procedure. Interesting that the Relearn Procedure should be performed whenever the battery has been disconnected.
https://www.youtube.com/watch?v=FDpUo3UPmto
https://www.youtube.com/watch?v=ZNxXM75zJOw
https://www.youtube.com/watch?v=FDpUo3UPmto
https://www.youtube.com/watch?v=ZNxXM75zJOw