EBC Fireball pedal sensor fault

[Newt]

Anyone have any clues about the pedal sensor on the Fireball by Electric Bike Conversions? Website (electricbikeconversions.co.uk) is dead. The problem is as follows: when turning crank, sensor activates motor only for a split second every revolution. Motor works fine on the throttle. Have removed the left hand crank to clean and inspect the rotating ring (see image) but can't see anything wrong. Suspicion is that sensor is faulty. Wiring to it looks ok. Looking for any thoughts including advice on whether these sensors are available as spares, if so how much, and instructions for removal and re-fitting?

 

[Andy-Mat]

Anyone have any clues about the pedal sensor on the Fireball by Electric Bike Conversions? Website (electricbikeconversions.co.uk) is dead. The problem is as follows: when turning crank, sensor activates motor only for a split second every revolution. Motor works fine on the throttle. Have removed the left hand crank to clean and inspect the rotating ring (see image) but can't see anything wrong. Suspicion is that sensor is faulty. Wiring to it looks ok. Looking for any thoughts including advice on whether these sensors are available as spares, if so how much, and instructions for removal and re-fitting? View attachment 39624View attachment 39625

Guessing only, inside it looks to me as though it is damaged on the photo, the "teeth" appear not to be aligned to each other as one might expect.
From the photo the sensor appears to be "glued on" in some way, but do wait on the advice of others, more informed about this particular unit, as maybe they can assist you in removing it to see exactly what is wrong.
Also rust on the shaft does not inspire confidence for me personally. For which I myself use WD-40 spray (keep away from brakes!), as if it can stop ICBMs from corroding, an e-bike must be easy peasy!!
Regards
Andy

 

[Nealh]

The sensor head orientation is in the vertical plain, try fitting said PAS so the sensor sits in the horizontal plain with it at the bottom of the BB. I know when I have tried two part sensors in the past that sensor head position doesn't work correctly if orientated in the wrong plain.
The inner plastic teeth that grip the BB axle look ok but double check that the they do rotate with the axle and that the inner unit is freely turning and the outer doesn't.

 

[Newt]

The sensor head orientation is in the vertical plain, try fitting said PAS so the sensor sits in the horizontal plain with it at the bottom of the BB. I know when I have tried two part sensors in the past that sensor head position doesn't work correctly if orientated in the wrong plain.
The inner plastic teeth that grip the BB axle look ok but double check that the they do rotate with the axle and that the inner unit is freely turning and the outer doesn't.

Thanks for the responses so far. This is a new system to us so appreciate the thoughts. The whole ring turns as one so the outer and inner must be seized together? Problem comes in removing the plastic cover as it appears to be attached at one point. See attached. Agree the corrosion on the spindle was a bad sign. This bike has been hammered.

 

[Andy-Mat]

Thanks for the responses so far. This is a new system to us so appreciate the thoughts. The whole ring turns as one so the outer and inner must be seized together? Problem comes in removing the plastic cover as it appears to be attached at one point. See attached. Agree the corrosion on the spindle was a bad sign. This bike has been hammered.

It looks REALLY nasty now that you have the top cover off, basically about how my imagination had already pictured it, sadly!
Best wishes for a speedy replacement and a fully working e-bike again.
regards
Andy

 

[vfr400]

Your photo isn't very clear, but something looks very wrong. The bit that's clipped into the bottom bracket is still in there. The whole assembly should lift off together. Pull the rest of it off, then it should be more obvious what the problen is. Basically, there's an outer piece that clips into the BB and an inner piece with fingers that grip the axle. The inner piece rotates with the axle and the outer is fixed by the BB spline. The bit you have in your hand is the actual sensor, which should be attached to the outer piece that's still in the BB.