Here was my original post:
Stock 2017 7-speed. Nothing has changed, as far as settings, parts, modifications, etc. Pedal assist was working fine then quit. Riding along on flat smooth road, and suddenly LCD screen showed output in PAS 5 go from in the 350 W - 400 W range then quickly plummet down to 0. After motor cut-off (hit brakes, etc.) PAS will start to work again, but very quickly plummets to zero again. Same issue regardless of PAS setting (1 - 5). Throttle works fine, but no assist. Tried cleaning the sensor and the magnet ring. Made sure it was close to the sensor. Checked connection from sensor to the controller.
It was suggested by Reddy Kilowatt:
You could try replacing the PAS assemble. I’d spring for this from Bolton but it’s currently out of stock like so many Chinese supplied ebike parts and if your chain has ever come off the chainring you know why. https://boltonebikes.com/collections/electrical-accessories/products/single-piece-pedal-assist-pas-sensorThis IS in stock. https://boltonebikes.com/collections/electrical-accessories/products/pedal-assist-pas-sensorIf replaced and problem persists, replacIng the controlling would be my next step.
A new PAS sensor didn't fix it, so I ordered a new controller from the Sondors site. All the cables matched up and it looks just like the original one. I swapped the controller and tested the bike. PAS works, throttle works, but the display shows nothing for charge level, 000 for Speed and 000 for amp usage. So the bike "runs" either pedaling with assist or throttling, but have no read-out for speed, battery charge level or power usage.
Any help appreciated!