So my f4i died a couple months ago mid ride and had to get it towed back home and I'm trying to see what's wrong with it. Fuel pump primes, cranks, sparks and I can visibly see the injects spurt gas.
So far here's what I've tried to do to diagnose the issue.

-Replace fuel pressure regulator
-Replace Battery with lithium (14.4v)
-Check fuses (All are and have continuity)
-Test ignition pulse generator (around 500 ohms)
-Bypass BAS
-Bypass Kickstand sensor
-Bypass clutch switch
-Test fuel cut relay and engine stop relay (Both are clicking when cranking the bike)
-Brand new spark plugs (all 4 are sparking)
-Compression test is good
-New gas
-When trying to read diagnostics the FI light doesn't blink it just stays on
-Both lowbeam and highbeam work properly, relays are good
-Test ignition, 9v is going in the pink wire
-New oil and filter

At this point I'm gonna draw blood scratching my head, the only thing I can think of is the ECU dying. When I first bought the bike the headlight wiring harness was all mangled up and sometimes it would short and blow a fuse so that might've messed with the ECU somehow but after replacing the harness the bike ran for a couple of months before dying like this. If anyone has a 2002 f4i ECU for sale or any tips that would be appreciated.

 

If the ecu is providing petrol and a spark what do you think that it’s not doing that indicates failure?

 

Man if I had a clue I would’ve checked it. I’m at wits end and its the last thing that may the issue that I can’t really test. I’ve read on forums with issues like these and once they replace the ecu their bike is good and thats what I’m hoping for at this point.