OBD socket wiring not working

[1981t25gti]

hello,i have a mk3 golf AGG engine fitted to my 1981 vw camper ,  does anybody know if my OBD socket will work on a rolling road with only ports numbers 7 K line , ground and port 16 live wired up , it works with a computer to read any faults , but when i went to get it tuned on a rolling road the machine coulndt find the ECU, does it need any more info , any help would be great

cheers

[Screech16v]

If you can read codes then its talking to the ECU ,maybe it doesnt like the tuners equipment

[itavaltalainen]

rolling road might be OBD2 and not support KKL protocol VW use on OBD1

[1981t25gti]

thanks for thr replies , just remebered that his machine couldnt find an AGG engine on his list ??, thought that was a bit strange