The software trw2scan is the only freely available tool being able to communicate with airbags ECUs using the TRW2 protocol. This kind of ECUs is found in many cars built by Fiat until the late 90s (Fiat, Alfa Romeo, Lancia,...).

The software is used together with script files that define the communication details that are different from car to car.

The usage syntax is:

trw2scan scriptfile

Hardware

trw2scan works with USB KKL-adapters based on FTDI's FT232 chip. There are many sources found on the web, one is stated below.

To be able to connect to the GTV ph 1 (ECU 60625181) the L-line must NOT be connected. You need to modify either your KKL-adapter or the OBD2 16-pin to Fiat 3-pin adapter cable for this purpose.

ECUs known to be supported

ECU number	Cars
60631206	Alfa 145/146
60625181	Alfa GTV phase 1 (Make sure L-line is not connected!)

Safety Issues

It is strongly recommended NOT to use this software while the airbags ar connected to the ECU! For disconnecting follo the procedure proposed in the respective workshop manual. E.g. disconnect the battery and wait for 10 minutes before disconnecting the airbag.

Airbags should be replaced by 3.3Ohm "dummy" resistors in order to prevent the ECU from detecting the missing airbags.

Disclaimer

Working on car electronics may cause severe damage and danger and has to be done by qualified personnel using qualified equipment and software.

trw2scan is no qualified tool suited to perform car repairs. The software is intended only for educational purposes demonstrating on board diagnosis protocols. The usage together with devices that are connected to car electronics or airbags is not recommended. The software is provided "as is" without warranty of any kind. Any liability for damages caused by using the software is excluded.