I know Chuckster has previously mentioned failures of these ECMs. Hopefully he will describe the failure mode. I have not read about a lot of failures in the last couple of years except for ignored over volt condition and one guy who's friend started disconnecting battery wires while the bike was running.Yes, STVA/ stepping motor, and yes again I meant to say secondary throttle plates flutter back and forth. I saw a post by Chuckster saying that he saw hundreds of ECU's fail on 06/07 models, so even thou I never had charging issues I decided to check my voltage regulator. It passed the inspection as per Suzuki shop manual, however it has to small holes in the back of it. Possibly its on its way out and it damage my ECU
Glad you got it fixed and thanks for posting the resolution.As promised here is an update. In my case the ECU was the problem. I installed a used one and the problem went away. I also got a Ricks R/R just to be sure cause I still can't understand what caused the ECU to fail. Here is a little fact:
Suzuki R/R output at idle 14.4V, 5K RPM 15.48V.
Rick's R/R output at idle 14.45V, 5K RPM still 14.45V. Those are the values I took from my bike and Rick's R/R works much better. It is very possible that O.E R/R when very hot at high RPM spikes the voltage past 15.5V. I'm thinking of adding a "volt gauge " to the bike in the near future.
Thanks for all your input and help.
Same problem as mentioned above. STVA checks out good abot 7.4ohms then checked the stps also good readings open and closed butterflies. What I'm wondering is if it's possible to use an ecu from an 09 an long as you get the wiring harness for that year also? Because the ecu for 06-07 gsxr 750 seems to be hard to come by.Has to be a 2006 or 2007 ECU. There's really no way to diagnose it other than swapping it with a known good. It's more of a process of elimination to get to that point, which you've already done. It's just a hypothesis and I really don't know the pathology, how much of an over-volt it takes to cause the damager, or any other details. Only a lot of history and testing to show the STVA is good, and reports that the bike just suffered from other electrical issues. Just a lot of reasons to think the ECU is the issue.
The other issue I've seen is a STPS that has cross faulted. Usually that causes a different behavior that a fluttering. I would say your ECU is the faulty component.