LT-01 displays 55mph

[KIWI in FL]

I'm working on a wolf warrior x with an LT-01 display. When you turn it on the display shows 00 (as expected) for about one second and then the 00 changes to 55 mph. This happens while it is idle and stays 55 whenever you're riding it. Everything seems to work otherwise and the P settings are correct. It is set to bump start and it does need a bump start before it will accelerate. Ideas as to why?

 

[jetpackjbd]

Try checking the wiring for your throttle. It’s possible it has some weird dead zone that’s reading as 55MPH, maybe? One time my bike showed 62MPH when I first turned it on, but went to 0 a few seconds later, like the opposite of your problem. It hasn’t done that again though so I can’t provide any diagnosis to it. My scooter’s potentiometer has dead zones in the throttle that read weird, which makes me think that might be related to your issue.

I’d check the solder for a loose connection, read the potentiometer ohms with a multimeter when you turn it, and look for corrosion. Sometimes just disconnecting an reconnecting wires fixed things top.

EDIT: ignore this, I confused throttle with speed sensors

 

[amberwolf]

A speedometer doesn't read the throttle.

It reads the wheel speed sensor. That might be in the motor for a hubmotor, or a separate frame mounted sensor.

Most of the displays for systems like this get the speed signal in the serial data from the controller, so if the speedo shows something incorrect, it's almost certainly incorrect at the controller, *or* it's an error code (as the speedo is the largest part of the display on most of these, so it is usually used for error codes to make sure the user sees them).


So a throttle problem won't have anything to do with a wrong speed indication, and vice-versa. Especially if it's when stopped.


Additionally, not many systems use potentiometer throttles anymore, they use hall sensors (this display/throttle unit uses a hall sensor, there are disassembly pics in various threads around here), so there's no ohms to measure, just volts when it is powered on and operating. (ohms in a pot throttle is only measurable when the throttle is completely disconnected from all the other electronics, and has no power to it)

 

[jetpackjbd]

A speedometer doesn't read the throttle.

It reads the wheel speed sensor. That might be in the motor for a hubmotor, or a separate frame mounted sensor.

Most of the displays for systems like this get the speed signal in the serial data from the controller, so if the speedo shows something incorrect, it's almost certainly incorrect at the controller, *or* it's an error code (as the speedo is the largest part of the display on most of these, so it is usually used for error codes to make sure the user sees them).


So a throttle problem won't have anything to do with a wrong speed indication, and vice-versa. Especially if it's when stopped.


Additionally, not many systems use potentiometer throttles anymore, they use hall sensors (this display/throttle unit uses a hall sensor, there are disassembly pics in various threads around here), so there's no ohms to measure, just volts when it is powered on and operating. (ohms in a pot throttle is only measurable when the throttle is completely disconnected from all the other electronics, and has no power to it)

Oops, I don’t know how I forgot how a speedometer works.

 

[Bbbbrass]

Also, are you sure it’s not going 55?

 

[jetpackjbd]

Also, are you sure it’s not going 55?

That’s definitely one advantage of EVs, can’t idle at 55 in an ICE!

 

[KIWI in FL]

I changed P2 (motor magnetic pole setting) to some other number, and then back to 30 (the default). That fixed it.