Hi, thanks for using JustAnswer.com. E3 is an error code for the drive system. Many parts make up the drive system, so there are many things to test. I am happy to send you the service manual if you would like specific test procedures for the individual components. You will need a meter to test for voltage and/or resistance, FYI.
Drive system is not working
correctly. Bad windings, speed
sensor, wiring connections, or
I would like the service manual, can you send it electronically?
Here is a link to your manual. YOU DON'T HAVE TO PAY TO DOWNLOAD! Click on the free download option, right hand side of the screen. It will take slightly longer than the pay version, but it's FREE!