Turns over but wont start 2002 nissan altima - 2002 Nissan Altima

Begin troubleshoot your car to the fuel system, does the fuel goes to fuel rail, check the fuel pressure, does it pressurized? if no pressure check the fuel pump or fuel itslf,check the fuse of injectors and coils, also the coil ground, if all ok, try to remove one spark plug wire and observe the high voltage drop while crunking the engine, if spark is ok and fuel is ok, it engine timing problem, if no spark check ignition system voltage on and grounding, if voltage ok, but no spark, check the crankshop position sensor and camshaft sensor.