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2020 EM Epure Race controller issue


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You need to explain the problem in more detail. 

Do you have the optional regen lever (EM calls it PRB-R)?

Are any tones emitted by the motor when you press the map button?

Note that the controller will not permit the motor to run if there is a fault with the throttle.

You can find the wiring diagram here: https://www.electricmotiontech.com/home/em-epure-race/wiring-diagram

 

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It's easy to try the encoder re-calibration process described here: https://www.electricmotiontech.com/home/em-epure-race/motor#h.aqwdzouw61q4

It's possible the throttle signal is out of range.  You can try unplugging the throttle, cycling the battery on/off and then reconnecting the throttle.

A crash can also pull on the handlebar wiring and cause trouble.  It's best to have some slack in the wiring to the handlebars.  Check for poor contact at all the connectors.

Failing that, it will take someone with electronics knowledge and a multimeter.

 

 

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I've renewed the wiring loom and it worked for a bit then went back to being faulty. The only other bad bit of wiring was the battery display lead, especially the earth connection. I've removed it and at the moment it's working! Could this be a coincidence or could a bad earth cause this malfunction?

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On 9/4/2024 at 7:59 PM, chrisexall said:

I've renewed the wiring loom and it worked for a bit then went back to being faulty. The only other bad bit of wiring was the battery display lead, especially the earth connection. I've removed it and at the moment it's working! Could this be a coincidence or could a bad earth cause this malfunction?

It definitely sounds like a bad connection somewhere. I'd suggest going through every connector, visual inspection, contact cleaner, then dielectric grease (around the plug, not on the metal bits) and a double check that the connector is back together properly afterwards.

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