Please add FIAT test connector image at http://pinouts.ru/CarElectronics/fiat_test.shtml
It uses 3 pin IP67 Amp Superseal Series connector. Female on vehicle, male on diagnostic cable.
Description of connectors is here: http://export.rsdelivers.com/product/te-connectivity/282105-1/ip67-3-way-tab-housing/3141261.aspx