Pendleton Somerby e bike fault

[Goog]

Hi,
I have a Pendleton Somerby e bike bought second hand.
The other day there was sudden loss of power then the fault disappeared for a day.
It has now come back, power is in surges and stops all together after about 4 mph.

Halfords have confirmed the crank sensor is still working but can't say for sure if fault lies with the ECU and or the motor.
Their workshop is fully booked for a fortnight, then after proper diagnosis there is a further week's wait for parts.

Obviously I will now go down the route of employing a local independent e bike repairer.

Any ideas anyone on where the fault lies?



Any ideas anyone

 

[saneagle]

Check that the motor connector is in all the way to the line, not just in tight.

 

[Goog]

Repair specialist has diagnosed battery fault.
Surely the battery power delivery/ holding charge would fade out over time?

 

[Tony1951]

Fully charge the battery and then measure the voltage on the output pins. It should be at about 41.9v or even 42v.

Did you do what Saneagle said and check that the motor connector is fully plugged in up to the line? He has seen random looking faults many times due to poor connection.

I am surprised that if the battery was at fault, it would go from fault to running normally and then go to the fault condition again. I am of the opinion that i would be looking for erratic connection problems like the one saneagle mentioned.

 

[Sturmey]

I think a bad cell group can cause the battery management (BMS) to cut the battery power under load. The pendleton (that I am familiar with) (2017) uses speed control so it gets a good surge of power to bring it up to speed before the current settles back.

 

[saneagle]

Repair specialist has diagnosed battery fault.
Surely the battery power delivery/ holding charge would fade out over time?

You can get a clue to whether it's the battery or something else by watching the panel on the handlebars. If you see the indicator lights going down before the motor cuts and the panel switches off, it's probably a battery problem. If the panel stays switched on and/or the indicator lights don't go right down, it's probably not a battery problem.

When I say a battery problem, I mean that the voltage is collapsing. It can do that because the battery has a fault or is worn out; because the current demanded is too high for it, which happens when the motor cable isn't in far enough; or because of a battery connection fault.