Can I modify ELM327 cable with switch instead of using adapters? For connecting to other computers, not only engine. Any tutorial online? Thanks.

Hello everyone, i'm having hard time figuring out why my Alfa 156 JTD won't connect to Engine ECU. I definetly have correct drivers and all interfaces work ok (tested on other cars). I guess the problem is i'm not getting signal from ECU. Pin 7 in OBD connector is connected to pin 48 in ECU, but I d...