How to identify specs of working motor

Hi all.

I have an Epson flatbed scanner I'm about to trash. The stepper in it is still working, so before I get rid of the circuit board that drives it, I'm wondering how to capture the specs for it. I have a digital multimeter. The motor is a four-conductor design that plugs into a modular plug; when I power up the scanner, it moves the motor briefly. Not sure what measurements to take in order to determine the motor specs. Thanks for any insight.