The by-wire throttle that was malfunctioning in September has come back again, so I've been maintaining it. This time I'm almost sure I got to the root cause, so I'll leave this as a reminder.
In the end, it turned out that the cause of the sticking was not the adjustment of the slider tensioner on the grip that I did last time, but the sticking caused by this spring deteriorating and interfering with the case.
There are traces of rubbing, and the dimensions (within the width of the spring rod) match the actual amount of catching (1mm) when the throttle is opened slightly.
The light blue area is chamfered to prevent interference when opening the throttle, but not the one going back. If the root of the spring wire gets caught here, it can cause the throttle to not close all the way by a few tenths of a millimeter when returning the throttle. If the problem is minor, it will be felt as a snag, and if it gets worse, the throttle will not return and the car will go into cruise control 😁 So I chamfered the part with the red arrow.
This is probably just a phenomenon of the spring and the part that hooks it being worn or deformed due to deterioration, so I shaved the body of the magnet side and also stuffed sponge into the arrow part that hooks the spring to prevent the spring from going deeper.
As an added bonus, I stuffed the joint between the throttle grip and the controller with sponge to reduce the play to almost zero, because I hate throttle grip play. That's how delicate it is!
I'm really glad that I was able to clear up some of the issues I was having with the previous emergency treatment.
This is the first time for the manufacturer to use this by-wire, and even though the clearance was obtained in the design, they didn't calculate that it would go wrong due to use and deterioration. I really hope this blog will help improve the quality of this 🐮
Also, I think this bi-wire throttle grip is used in other cars as well, so if you have 40,000km on your car and you feel something is wrong, you may want to question it. However, as I mentioned before, this part is designated by the manufacturer as a non-disassembly part (in the event of an abnormality, all parts must be replaced), so if you disassemble it, please do so at your own risk.