It would either indicate that the ECU or MCU is recieving an out of range signal for engine speed when compared to other sensor inputs. If the ECU or MCU has a bad connection or poor ground it could be that its not sinking an input to ground allowing for a false logic high input from the speed sensor.That is crazy. It says the engine speed is abnormal but the fix is to check the ECU and MCU wiring.
So what exactly is it abnormal engine speed or a wiring issue making it think engine speed is abnormal.
Seems weird. What if the engine speed really was abnormal how is the wiring fixing that.
Interesting for sure.
One of the advantages we had was test equipment for every LRU and SRU.Unless it tests out fine then it would have saved you $120 on a part you didn't need.
But I get it. Easier to change the parts because it isn't really even possible to fully test it NOR it's connection to the wiring.
My friends 2019 with 300 miles on it is still in the shop 5 weeks now and no further along than when dropped off other than they now know a new MCU
did not fix it.
They are still trying parts. The $600 MCU didn't fix the issue. They are going to install a shift actuator next.
If Yamaha can't pick the right part then this could get really expensive trying to fix yourself. Not much different it doesn't seem as they are just swapping in parts until it works again. Lol. Good thing it is on their dime but a $28,000 machine sitting in the shop eating up driving and warranty time is still costing money.