Multiecuscan

Hi,
Is this program useble for american cars?

As long as it is a supported model, yes

Does somebody know a program like EPER for american cars?

In the US you are better off with regards to parts lookup for later Fiats.

See: https://www.moparrepairconnect.com/
and: https://catalog.moparrepairconnect.com/

The ZAR doesnot recognize in these sites