Stevie's is one of the last non-immobiliser ECUs and the same as my 2000 M900.
The more advanced (complicated) ECU came along later in 2002 when everything went electronic including the speedo.
As Luddite points out, a 2004 will definitely be all electronic with immobiliser and needs the red key and code card.
The early simple ECU has less idiot lights on the dash and the oil pressure warning light is in the rev-counter.
__________________
|