eBike Repair - Unresponsive Motor - Electronics Diagnostics and Reverse Engineering (v. 1hr)

For almost one year and 15,000 kilometers I had enjoyed my eBike as a delivery courier. I originally purchased this new electric bicycle from a popular department store's international marketplace. Moma Bikes e26: https://momabikes.eu/products/electri.... One day while returning home from work as a courier, the motor suddenly became unresponsive in ordinary circumstances for no clear reason. Since the battery and all other electronics seemed to function properly, a diagnosis of the situation began by analyzing the main power line from the battery to the controller, then to the motor. This process gave rise to weeks of unpaid learning, ordering of new parts, accessories, tools, and a diagnostic device. I also had to learn the technical language in polish. Mostly generic components had to be researched! The fast 8x version of this video can be viewed here:    • eBike Repair - Unresponsive Motor - Electr...   (More links at bottom) The most challenging was using AI to approximate the knowledge of the inner workings of elusive proprietary hardware, electrical voltage measurements and software application settings. In the rapid 8x speed video version, there is a normal-speed moment showing the re-soldered wire on the motor circuitry which seemed to bring back the correct continuity (at the 24 minute mark in the 1 hour version) and voltage measurements with a meter in manual motion. The installation of a new throttle also activated the motor (previously there was no throttle) and in turn unveiled the possibility that there may be a problem with the pedal assist sensor (PAS). Most of the connectors and pins from the controller needed replacement. This involved wire stripping, crimping, customizing, soldering, glueing, and water proofing based on electrical specifications. Within the display application custom settings (LCD software), AI was used to edu-guess numerical settings and calculation approximations. For example, despite having a certain amount of magnets inside the motor and PAS, only other numbers entered into the software actually enabled the motor. This is because the motor, as a component from another design, expects certain electrical signals that are different than the other components are designed for by other companies with different standards. Another setting described in the instruction manual for the LCD was wrongly written as having certain numerical values in kilometers (per hour) instead of percentages of current (available power). The public and free AI model ChatGPT-5.3 was used as assisting intelligence, sometimes with image uploads of parts. The following is what it had to say once the bicycle started to regain full functionality: "You basically solved the hardest part of mixed eBike systems, matching signal characteristics between mixed components." Previously for help I had asked the seller, the department store, an electric bike shop, an amateur electronics master, eBike courier colleagues, and ordinary (non eBike shops). I was told all sorts of conflicting information. The main help desk said that this kind of diagnostic process is handled by sending the bike across several countries back to the seller in an undefined amount of time and for unknown costs - not possible for my situation as a bike courier. At some point I realized that the work I was doing to fix it is more than they do at repair shops - so I began applying for a job at shops but they said I do not have what it takes. I did learn that they mostly do obvious fixes there, such as ordering high quality parts for specific big brands while using top tools with clear instructions. No thinking or solving of anything as I was trying to do because it is not worth their time at the business level. In the end I learned a lot but it cost me half the price of my eBike and two months of lost work. I had to rent another bike temporarily, find temporary work elsewhere and go through the consequences across various dimensions. I hope this helps other people with their decisions regarding eBike repairs. For my Moma e26 eBike, the following new components were installed with custom physical solutions and application settings: LCD display, Controller, Throttle: Zestaw kontrolera silnika bezszczotkowego do roweru elektrycznego, 24 V, 36 V, 48 V, 250 W, 350 W, kontroler 17a, S866, wyświetlacz LCD, przepustnica, 8 czujników magnetycznych. https://www.amazon.pl/dp/B0BW97NNHL Pedal Assist Sensor (PAS) The seller sent me a new one for free, because originally I thought this was the issue. front and back lights: https://allegro.pl/oferta/2k-lampa-pr... https://allegro.pl/oferta/2k-xc-172e-...