Multiecuscan

Hello all,
My engine warning light is turn on. Tried to connect but without luck. The wierd is that i can conect in dasshboard or the body but not in engine. Any ideas why?
I have a Fiat Stilo 1.6 2003.

Still have the problem.
I install a new ecu before 4 years. Is it this something which can cause this problem?
If any expirience member can help me it will be great.