ISO 14914: KWP2000 & KWP1281 Specifications

Evening everyone,

I'm still looking for the protocols for communication with engine control units (ECUs). I've found all sorts of random information, but nothing about the request and response formats. Can anyone give me a tip or, better yet, a link where I can find this information?

'Please provide the text you would like me to translate from German to English.'

Jörg.