Throttle Disassembly

[BlitsBoer]

Hi Guys,

I have an eScooter with a suspected faulty hall sensor in the throttle. When coming to a stop and reapplying throttle the scooter does not respond. Only after a few twists does the power come back. It never loses power once it's going. I've disconnected the throttle, but for the life of me can't get it completely apart to check. It seems to be held together with plastic tabs. Any suggestions on how to get it open whilst not breaking it simultaneously?

 

[amberwolf]

Don't take the throttle apart yet. They're often very difficult to reassemble in a working fashion.

A sensor problem would almost always result in a non-working system at all times, not just at the specific time of stopping.


First check the voltage output on the throttle signal wire at the controller. Multimeter set to 20VDC, red lead on throttle signal wire, black lead on ground (or battery negative). If it changes voltage normally even when the problem is happening (very likely) it is not faulty; something else in the system is causing the problem. If at the moment of the problem it's voltage does not change and actually goes to zero volts (instead of around 1v it would usually have when not in use), check the 5v supply wire to the throttle from the controller. If that is not around 5v, then check the battery voltage to the controller.


The first most likely fault is an ebrake sensor being "sticky", which takes a moment to release itself after you let go of the brake lever.

The next most likely fault is a controller problem, where it is sensing an overload or undervoltage or overtemperature or a motor sensor fault, etc, and is temporarily shutting down.

A slim possibility is a loose magnet in the throttle, but these don't usually self-realign to working condition just by twisting the throttle repeatedly, so unlikely.