Wondering if anyone can diagnose this?

[Lloyd]

I have a Juiced 'Camp Scrambler' that was working fine untill last summer but now it has an issue.
https://www.juicedbikes.com/products/scrambler


First a little Info: 52v 13ah, throttle speed limited to 20mph and 75% power output via stock controller, pedal assist speed 28mph and feels more nippy, especially on race mode.

However around last summer I noticed my battery was starting to not get me the range I was used to (3rd year of ownership)

Also, around the same time I changed the disk brake pads and they rubbed quite a bit and I just rode it out till they wore down enough, which ended up being a lot longer than expected so motor may have had a minor bit of rubbing/friction/stress, the bike had a gradual decline but faster over the last year than the previous 2.

Right now my bike behaves like this: throttle still works the same (aside from about half battery capacity now), pedal assist works fine on on a flat or downhill but when going uphill it cuts in and out every second or so ON/OFF/ON/OFF so you can't get up a hill. It feels like the bike has lost the ability to take load? as its only going up hills this happens



I've narrowed down to PAS SENSOR, BATTERY, or HUB MOTOR being the problem, if anyone can give me their opinion or suggest a way I can diagnose the fault myself that would be great!

 

[Chalo]

It sounds like the BMS is intervening to prevent you from damaging the battery. But that's not the only possibility.

First, check the easy stuff. Closely inspect the battery terminals that make contact with the cradle or mounting rail. Then check the plug on the cord that comes out of the battery mount. If any of these things look burned or melted, that might be the problem.

If those things all look good, the next things to worry about are cell imbalance and whole-pack voltage sag.

First let's get some background information. How old is the battery pack? Do you run it all the way down until it cuts off very often? What's your charging regime: do you leave it charged to 100% when not using it? Do you leave it plugged into the charger after it's full, or disconnect it?

Does your bike display have a mode where it shows battery voltage? If so, what's the battery voltage doing when the power starts cutting out?

If you fill in these blanks, we can get a better idea of what's going on.

 

[amberwolf]

^^ What Chalo said. ^^

 

[E-HP]

Right now my bike behaves like this: throttle still works the same (aside from about half battery capacity now), pedal assist works] fine on on a flat or downhill but when going uphill it cuts in and out every second or so ON/OFF/ON/OFF so you can't get up a hill.

Agree about more info.

One more question. How's the throttle work when going up the same hill?

 

[docw009]

I had a PAS failure last Fall. I could feel the power shutting off during one half of the pedal rotation. I swapped in a new PAS sensor with a magnet disk. Now I had a smooth power delivery, but the darn thing worked forward and backward.

I thought I could live with it, until I forgot and adjusted the pedals when parking the bike, and it powered up and jumped over the lawnmower. So in went a third PAS sensor. This one only worked in the forward direction, but it did the same power on, power off every revolution as the first one, but this was easy. The magnet disk was wobbling, so that was easily fixed.

I still don't why the first one did the on/off thing, as that disk is integrated in the same housing as the sensor.

Look at the magnet spacing, but I voted for a weak battery,