I'm working on a homebrew interface for my 2004 Mustang (including eventaully adding some sort of heads-up display). Can anyone suggest any good documents to read on the PWM protocol and the Ford messages. Also, does anyone have a schemtic for a PWM interface, other then using the Elm chip interface? The only homebrew OBDII interface I've found so far was for imports like VWs.
*Edit: I forgot to mention, even though some of the 2004 Fords have CAN, I'm going to be stuck with PWM.
Thanks,
Mike