2003 Nissan Sentra Turns over won't start

Car died after making a slow corner it just died. I had to have it towed home so I could work on it there for a would not start back up. I don't get any spark from the ignition coil pack Plug wires, The fuel pump is not priming the fuel relay just clicks. Found a bad crank shaft position sensor replaced it. Checked fuses and relays The car seems to be getting voltage where it is supposed to. Code reader says it failure in communication with ECU. Started checking ECU the parts we checked seemed okay do not know what else to do or what could be the cause of the problem alarm system has been removed prior to it dying in not restoring