Page 2 of 3

Re: M365 Pro Problem - Error 40 - Battery

Posted: Mon Jul 22, 2019 10:22 pm
by Andrew Harding
SUCCESS! For now... soldered and re-crimped the blue connector last night and just flew up my hill (10-15mins) at full throttle with my 95kg arse and NO overheating, no error 40... case temp never got above 55 degrees which isn't too bad? The hill is steep and prolonged as well. Will re-crimp and solder all connectors when I get a chance.

Re: M365 Pro Problem - Error 40 - Battery

Posted: Wed Aug 07, 2019 5:41 am
by razorblader
The problem is the stock FW has the motor constant set too high on the Xiaomi Pro in sports mode, it allows for a constant power delivery of 900 - 1000 Watts under load which is too high for the motor cables, the motor and the battery in the long run.

A custom FW with the motor constant set to 750 - 800 Watts will prolong the battery and motor life span and lessen the inherent overheating tendency of the PRO model.

Re: M365 Pro Problem - Error 40 - Battery

Posted: Fri Aug 09, 2019 2:43 pm
by Hacjob
Hi, I had an issue today with my Pro version which has not resolved itself. I rode the scooter home no problem, turned it off, and now the scooter simply won't turn on at all. I measured the voltage from the battery which measured 36.1V, which means battery should be fine as it was at around 45% when rode it last. I also noticed the burn mark around the blue wire, I'm thinking my main controller is toast, but is there any way to check whether it's the controller or dashboard that is toast?

Re: M365 Pro Problem - Error 40 - Battery

Posted: Mon Aug 12, 2019 7:59 pm
by alasano
Another blue burnt wire here. Everything stock firmware, weak kers and wasn't event riding uphill or downhill.

My symptom is different though, my motor vibrates really hard when kicking off and accelerating. It's like it's breaking and accelerating at the same time or something. The wheel can be turned by hand but there is a lot of resistance. W

When I disconnect the middle brown wire between yellow and blue, the wheel can be turned smoothly.

No error codes, no issues connecting or turning it on.

Any ideas on how to fix it or what it could be? My warranty is still intact so I don't want to take it apart if not needed.

Would love to know if there's a schematic of the board somewhere.

Re: M365 Pro Problem - Error 40 - Battery

Posted: Tue Aug 13, 2019 3:59 am
by michi_gecko
It seems that the controller is defective. One of the transistors is burned and has a short circuit.

I think this could happen if you use KERS with full battery or when you drive faster. Or maybe just bad components

Re: M365 Pro Problem - Error 40 - Battery

Posted: Tue Aug 13, 2019 8:57 pm
by alasano
michi_gecko wrote:
Tue Aug 13, 2019 3:59 am
It seems that the controller is defective. One of the transistors is burned and has a short circuit.

I think this could happen if you use KERS with full battery or when you drive faster. Or maybe just bad components
You are correct - I posted a picture here : viewtopic.php?p=14030#p14030

Re: M365 Pro Problem - Error 40 - Battery

Posted: Sat Aug 17, 2019 12:59 pm
by Hacjob
Soooooo....turns out my controller wasn't toast after all. I managed to turn on the scooter by shorting the black (ground) and the green (40V power) pins on the 4-pin connector on the controller (while the battery was connected). The controller turned on, and after I connected the rest of the cables everything was good and scooter was working, even the dashboard. However, I can't turn it off, so it leads be to believe there is at least something wrong with the dashboard or the 4-pin cable soldered to it... Need to investigate further, but at least its working. Too bad I already ordered a new controller for $46, buy hey it's always nice with spare parts I guess To view images REGISTER or LOGIN for full access.

Re: M365 Pro Problem - Error 40 - Battery

Posted: Fri Jan 03, 2020 6:57 pm
by Fraizer
michi_gecko wrote:
Sun Jun 16, 2019 10:36 am
Hello,

For two weeks I have the M365 PRO Scooter, which is really nice.
But I experience two Problems or strange behaviour.

1. Error 40:
Seems to be quite rare, because there is not much to find over Google.
After going uphill in "S" Mode (sometimes also "D") this error jumps in very soon.
The Display shows the "40" in red, and the scooter stops. If turned off and on again, I can continue driving at once.
The App says Case Temperature above 90 Degrees Celcius which equals to 194 Degrees Farenheit.
BUT, it does not seem so hot really. It feels a little bit warmer than my hand.

2. Battery Status:
The Battery seems to regenerate. After driving 2 Miles I get a reading of e.g. 60 %.
But I can see the mAh count going up while standing. It even went up, when I had the Wheel spinning in the air.
After maybe 1-2 hours the reading says minimum 5 % more, than after I have stopped. Sometimes even 10-15 % more.

So my question: Is that normal? Doesnt seem so to me.
Should I send it back, or try to fix it by myself?

In general: How is the quality of new Xiaomi Scooters?
great michi_gecko

thank you alot for that fix To view images REGISTER or LOGIN for full access.


do you saw other issues on the Pro ? To view images REGISTER or LOGIN for full access.

Re: M365 Pro Problem - Error 40 - Battery

Posted: Fri Feb 14, 2020 9:08 am
by john michaels
alasano wrote:
Mon Aug 12, 2019 7:59 pm
Another blue burnt wire here. Everything stock firmware, weak kers and wasn't event riding uphill or downhill.

My symptom is different though, my motor vibrates really hard when kicking off and accelerating. It's like it's breaking and accelerating at the same time or something. The wheel can be turned by hand but there is a lot of resistance. W

When I disconnect the middle brown wire between yellow and blue, the wheel can be turned smoothly.

No error codes, no issues connecting or turning it on.

Any ideas on how to fix it or what it could be? My warranty is still intact so I don't want to take it apart if not needed.

Would love to know if there's a schematic of the board somewhere.
I have exactly the same problem. Did you get anywhere with it?

Re: M365 Pro Problem - Error 40 - Battery

Posted: Fri Feb 14, 2020 10:41 am
by michi_gecko
The problem with the burn marks on the cable shoe is standard. Take new ones, crimp it better or also solder the crimping connection.

The other problem with the motor could be some burned traces on the PCB or a burned FET. If the motor turns freely with disconnected cables on the ESC, then you know where the problem is. FET can be exchanged or new ESC.