Hello again, ok as I told you before the only way to test the EPS is thru the EPS indicator to get an error code, since from your video we don't get a good sign of error or blinking of the indicator the only way is to discard what is wrong. Since your EPS indicator turns off after ignition and it should be on until engine start something is not very wright. The connector draw which cosmosdan gently upload are the test cable which goes to the PDA, you should have a test connector plug in the front of the ATV labeled EPS and another labeled ECU. Since there is no error code the PDA will not find much since it is just a code error reader. From what I get of your video I will go checking the EPS fuse, then all cables and plugs that goes to the EPS ECU and to the motor as well. The EPS ECU is located over the right front wheel behind the light plastic cover, revise your service manual on how to disasemble it, you have to remove it and check them. Other test what I would do is to see if the ECU receive positive current. There are not much troubleshooting for the EPS on the manual, fuse, cables and plugs, motor and finally the EPS ECU, I read in this forum but I can find it is that someone open the ECU and there was something burned inside? The next step is to swap the ECU with another good one and try to see if you find a different to discard ECU problems or malfunction.
There is not much I can tell you, you have to tell us your test and discoverys, so we can go with other option after we get your findings.