GoldenMotor.com Forum

Hi Ameriks andto the forum.

Error 2 on the BAC-601 smart display indicates a throttle fault. Replacing the throttle with another working one would be the easiest way to confirm if it's just a failed throttle.

It might be worth trying it with the throttle connected but with the brake connectors disconnected and see if you still have the same problem.
If the error disappears, try plugging in the brake connectors one at a time to see which one is causing the problem.

If the throttle cable has been trapped, chaffed or strained, there could be a break somewhere inside the wires or even a poor soldered connection on the throttle's Hall Sensor.

If the fault occurred during a ride in wet weather, perhaps some water has found its way into either the throttle unit or the 5 pin throttle connector or even the main 10 pin connector, as this might also be able to cause the error 2. Visualy check that all connectors are still nice and dry and also make sure that no pins have been accidentally bent on any of the connectors during your testing.

The +5V output from the controller that powers the Throttle's Hall Sensor can sometimes fail completely (or simply become too low) so you might want to take a look at this post to see how to check the +5V output from the controller.
I realise that you've already tried another controller, but if there was a problem with the bike's wiring it may have affected the +5V supply.

Alan
 

Hello everyone,

I recently encountered an Error 2 on my Magic Pie 5 electric bike, and I'm looking for some guidance on how to diagnose and fix the issue.

Here's what I've done so far:

    Tested the motor with a different controller to see if the issue persisted—unfortunately, it did.
    Disconnected everything and left only display connected

Despite these efforts, the error still persists. I would greatly appreciate any advice or troubleshooting steps you could share, especially if you've experienced and resolved this issue before.

Thank you in advance for your help!

The motor shown in your photo is a Smart Pie, but the wiring should be the same as the MPIII, MP4 or MP5 dependent upon which version of the Smart Pie it is.



Your Fat Wheel version will probably have a longer axle and wider dimensions to the ones shown below:



You need to measure the voltage on pin 4 relative to ground (B-) with a battery connected.
A 12V battery should be sufficient to produce the +5V supply on Pin 4 if it is a later controller.

Unfortunately, it can difficult to tell the difference between the early Smart Pies with the Square wave controller and the Smart Pie 4/5 with the vector controller until you hear them under load. The noise emitted from an early Smart Pie increased with the load, whereas the minimal sound emitted by the later motors with the vector controllers only varied with wheel rpm. It did not noticeably change when under load or with the throttle released at the same wheel rpm.

Alan
 

Thanks a lot Alan for the detailed response, this is much appreciated.

I will Check diameters, but also the 5v on the 5pin cables might be a very good way, I will check if I have any resistance on that pin.

All my best,

Waheed

Hi Bargo andto the forum.

If the motor diameter is approximately 310mm you most likely have Magic Pies:





As you have the 10 Pin connector they could be any of the following three options;

• late version MPIII
• MP4
• MP5

The wiring of the MPIII, MP4 and MP5 motors is very similar except the MP5 had the additional +5V supply on the controller's 5 pin connector.

The 10 pin connector connects to the control harness similar to the one shown below:


The 5 pin connector is used to connect to the USB programming lead, the LCD Smart display or the Bluetooth dongle on MP5.

Check out this post for more details regarding the cables on the controller.

Alan