Bafang BBS02 diagnosis

[saulcozens]

Hi

I'm looking for ideas on what might be wrong with my Bafang BBS02. I recently went through a series of odd behaviours before becoming totally unresponsive. The behaviours included:

• not responding to the throttle
• continuing to power when stationery at lights
• high frequency (multiple per second) power drop outs
• going full power when not turned on (via the display)

and now I have no power or display. I have done some diagnosis:

• swapped out the display (for an old/cracked one) - no difference
• swapped out the EB-BUS 1T4 cable for an old one (with a broken brake connector) - no difference
• hooked the controller up to a laptop via a USB/serial - manage to read/write motor controller settings

I'm stuck on what to test next. Is there anything else I can check before I start buying parts?

thanks

 

[fechter]

That's pretty strange. I'd suggest opening up the controller side of the motor and re-seating all the connections. Also visually inspect for any signs of water ingress.

 

[aae34]

Running it with bafang's own firmware? Just curious, in either case the suggestion above is what should be done next.

 

[saulcozens]

yup - I've taken the controller off - totally dry. I guess I'll put it back together and see if it starts working.

If not - I'll start replacing parts - cheapest first.

And yes - stock Bafang firmware.