2003 Nissan Pulsar

2003 Nissan Pulsar 4 cyl Two Wheel Drive Automatic

hi

I have a Nissan Pulsar LX.
it does not seem to start and a mechanic said that it is proberly the ecu.
all the electricals in the car still work but there is no spark going to the spark plugs and the battery is fully charged and there seems to be no blown fuses,
do you have any idea what it maybe?

Thank You Very Much