BBS01 Hall sensor error

[Skyblot]

I've used the search function looking for looking for info on the "08" Hall sensor error in the BBS01 motor. All the info points to the hall sensor board or the controller. Or perhaps a PAS board.
The motor I have here displayed the 08 error and stopped. I tried another controller, and when plugged in the 08 error was gone, and the motor responded to throttle and walk assist. I wasn't a known good controller so I wasn't prepared to permanently fit it, so bought a new controller.

Installed, it worked briefly then stopped again with the 08 error. Interestingly, the display shows a power spike (200 watts) as the throttle is triggered but there is no motor rotation.
A new hall sensor board has been fitted with no change, it again shows power with no rotation. The motor is physically free and normal to turn via pedals.
The motor has been plugged into a different e-bike, so effectively a change of harness, display, battery, and all wiring, with no change in operation (or non-operation I should say).

Any thoughts while I go look for a PAS sensor board?

 

[fechter]

You could try disconnecting the PAS sensor at the controller and see if the throttle works.
Possibly something on the 5v line is pulling the 5v down enough to trigger a fault. Try measuring the 5v on any of the 5v lines (halls, PAS, throttle, brake switches).

 

[Skyblot]

Good suggestion, thanks.
I've tried a new PAS sensor board with no improvement, and tapped into the +5v line and it is stable. 4.6V on my meter but that's using multiple alligator clips etc. Measured voltage actually climbs a little with throttle activation. Also tried unplugging the PAS board and no change there either.

 

[fechter]

Hmm, there's not much else left. Error 08 is for the motor hall sensors. With the controller hanging by the wires, it may be possible to back probe the hall sensor signals. At the same time you have to make the motor move by turning the rear wheel backwards and watch the signal voltages. Each signal should toggle between near zero and near 5v. Easier said than done.