Hitta angående ECU så nu vet jag. :-)
Bra sida me förkortningar annars.
http://en.wikipedia.org/wiki/Engine_Control_Unit
An Engine Control Unit (ECU) also known as Engine Management System (EMS) is an electronic system which controls various aspects of an internal combustion engine's operation.
http://en.wikipedia.org/wiki/Electronic_control_unit
In automotive electronics, an electronic control unit (ECU) is an embedded system that controls one or more of the electrical subsystems in a vehicle.