Edc17c49 fiat can be read effortlessly using the PCMtuner V1.2.7. There’s no necessity to modify the transistor. This has been tested across various EDC17 versions, especially C49 FAL. While some users recommend 13.5v 3 AMP as the power supply, others find it challenging to get any reading. However, it’s crucial to understand that the tool isn’t the issue here. and your wiring is not the suggested diagram for FAL which wont help either..

try these if you must.  these control GPT – MMBT2222A, so no point in changing others.
For a clearer understanding, please refer to the attached visuals illustrating the connection of the cable to PCMtuner and its subsequent operation: