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Discussion Starter · #1 ·
My old ECU was fried, and this morning I installed a new one that came. Now, my bike cranks perfectly fine, but doesn't seem to start. It started and ran perfectly fine prior to the issues on the old ECU. I also just replaced the starter relay with a cheap one I got off ebay (but i dont hear any weird clicking sounds, so I don't think its failing.) My battery voltage is 12.9V right now. Diag mode shows that my kickstand sensor and clutch sensor are okay, my lean angle sensor is near 0 when the bike is straight up. Fuel pump voltage is 11.9V. Checked d61 and there are are no new error codes after I cleared the ones from the previous owner.

I read it might be a bad fuel pump (it was working before),
a bad starter motor (maybe from trying to start it a bunch),
the powercommander 5 installed,
or possibly the cheap Chinese relay I bought

Anyone got some ideas? Thanks!
 

· I miss my R1
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Battery is the #1 thing to check. Even if you've replaced it, there's lots of posts on here and other forums about new batteries not necessarily being "good" batteries.

If you have a multimeter, measure the voltage while cranking, if it's dropping much below 12v it's likely the battery.
 

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Discussion Starter · #5 ·
Battery is the #1 thing to check. Even if you've replaced it, there's lots of posts on here and other forums about new batteries not necessarily being "good" batteries.

If you have a multimeter, measure the voltage while cranking, if it's dropping much below 12v it's likely the battery.
Yeah, just checked. The battery is good. I also just tried jump starting it with the car, which didn't work either.
 

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Discussion Starter · #8 ·
Pull a plug check for spark if good spray carb cleaner into the intake if it starts bad fuel pump or injector isn't getting a signal
Sorry for the late reply, I'm gonna check that next week. I checked diag mode, and d:20 (sidestand switch) and d:21 (neutral switch) always says OFF, instead of ON. I was testing it in gear like I'm supposed to as well, but I'm confused. Shouldn't it not crank at all if these were OFF?
 

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Discussion Starter · #9 ·
Solved the issue. 3 diodes in the fuel pump relay/starter cut off relay assembly were blown. Opened the relay, replaced the diodes with new ones, and runs amazing now. I wasn't aware that this could be the issue, because it wasn't throwing any codes...
 
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