I assume you plug into the connector and then turn on the key? My interface has a red LED that powers up when the plug is connected, without the key being turned on incidentally. Check your settings on FiatECUscan and set the latency setting to as low as it will go I think it is 1? Mine didn't work before I changed this! Check your interface appears as a USB device in Device manager and assign the same COM port in the software. Then it's just a case of choosing the right ECU. Have you got the latest version 2.7 something? I tend to use versions 1.6 and 2.0 as I find the latest version sometimes gets the rpm wrong on graphs and lists. Obviously the latest version supports more modules, like body etc. Hope this helps?