You need to find out what version of ECU that you have. I doubt you're mefi5 like my 2008. I'd think either mefi 3 or 4? It will likely say on your ECU. If not there is a pic on the rinda.com site if you're entering info like you were gonna buy an overpriced diacom tech mate pro

This one would get to you quick and does 1-4, which is what I'm pretty sure you have.
CodeMate Tester - MEFI Code Reader - 3851088 https://a.co/d/66nHWXM

But ideas is you wanna shoot the parts cannon at your boat like I have for years:

Ignition switch
Kill switch
Cap & rotor
Ignition coil
Ignition relay and/or Starter relay
Plug wires

Engines need 3 things: air, spark, fuel. Figure out why it seems you're not getting spark.

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