We don't have that model in the U.S., but diagnosis should be similar with other Nissan products.
No error messages means that diagnostics will have to start with the basics. The car powers the (+) side of the coils and switches the (-) side on and off to fire the spark.
The crankshaft position sensor triggers the ECU to fire the coil spark at the correct time. See if the ECU is at least seeing the crank sensor pulse.
Battery and ignition switch power to the ECU and good grounds must be present.
If you disconnect a spark plug coil connector or an engine sensor and then crank the engine, it should induce an error code and light the 'ck eng' light. See if the ECU is able to do this, then erase the code.
These aren't the particular service manuals for the car, but the diagnostic steps may be similar. Nissan may use the same wire colors on all its models:
http://pdf.textfiles.com/manuals/AUTOMOBILE/NISSAN/maxima/2000/ec.pdf
or
http://pdf.textfiles.com/manuals/AUTOMOBILE/NISSAN/FX/2004.0_FX45-35/ec.pdf
Sometimes when an ECU goes into 'protection' mode from a short, it has to be reset with a battery disconnect after the short is repaired. The the ECU will resume proper operation if it senses that the short has been removed. Has this been tried?