Hi I came across this thread and yes I understand it's rather old...as id the J1850 PWM protocol that the original post was asking for information on.
I am a mature student looking to do a final year project on embedded systems and the J1850 PWM protocol and it's implementation (as that's what I have on my old Ford Fiesta 2001). I have gathered rather a lot such as the SAE 1850 Doc and various other sources however a lot of the stuff that is referred to is from a website that no longer exists (OBDDiagnotics.com).
Question is does ANYONE have any information from that website or any other of the standards or implementation of the system that I could use please.