Bafang M620 Throttle Stopped

Matteo2023

1 µW
Joined
Mar 20, 2023
Messages
3
Location
London
Hi everyone,

sorry, if this question was already asked and answered, but couldn’t find anything regarding this.

I do have a Seroxat with uart type M620. I have replaced a Magura e-brake sensor so far, and replaced dpc18 to a bluetooth display with navigation. (I did put back dpc18 to test if the issue can be elinimated). Also, equipped Supernova front and rear lights, and installed a step up buck with them.

Somewhere, at some point, I have lost the throttle function. It was working, and can’t remember since when it stopped, as I wasn’t really using it. I have replaced the thumb throttle, tried with unplugged e-brakes, but no success. The new throttle is compatible, for 100%, as well as the old one was working flawlessly back in the days. PAS is working, luckily, like before, and I have zero error codes.


Could anybody give me some help? Could I have messed up the controller? I wouldn’t like to swap it until I can’t try any other possibilities.


Your help is really appreciated, in advance, thanks a lot!
 
I would start by measuring the voltages on the throttle power and signal lines vs. the ground line. This is hard with the Higo connectors but you may be able to find contact points inside the throttle if you take apart the housing. Another way is to carefully split open the cable jacket to get access to the individual wires inside and pierce the insulation with needle points.
 
If you have tried a new throttle and/or a different harness cable to the motor...or tried another plug in the harness to the throttle with no joy, I wouldn't rule out a controller firmware issue. Communication with bluetooth display versus DPC-18, throttle programming might have gotten lost in the shuffle. Bafang makes a configuration tool aka an app to go into the controller settings. Might be worth a lot. My sense is your controller setting might have gotten tweaked when you moved away from the DPC-18 with bluetooth and a setting changed in the firmware of your controller to turn the throttle signal off.
 
This is hard with the Higo connectors but you may be able to find contact points inside the throttle if you take apart the housing. Another way is to carefully split open the cable jacket to get access to the individual wires inside and pierce the insulation with needle points.

Another possibility is to make custom jumper cables like these shown below to allow (somewhat) easy and non-invasive access to voltage measurements.


lNfF2Y2.jpg


As seen in this thread...


Regards,
T.C.
 
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