Sorry about short reply. Was busy. To elaborate...
Many things can cause no spark. If your not reading any voltage at coilpacks igniter ect. I would start by checking power to ecu. Then continuity from pin outs on ecu to cas, coils ect to make sure no wires have broken in the loom (I've had a cas wire need to be re run once (and that caused no spark.
This is after your general checks like spark plugs, leads ect. Also check if fuel pump is priming when you crank. If not I would say ecu power. If yes then another electrical issue like above. Also try clean all your plugs to make sure you get continuity. I've had problems on ca18's (Nissan) where nock sensor has failed stopping spark. If all this is still not picking up any issues and you have continuity with everything I'd put the fault down to hardware like ecu, cas, ect. But before spending money buying a new coil pack or cas or ecu I'd check wiring with multimeter first as it won't cost you anything but time to check