1997 E320 Cranks but will not start

[wakind]

My check engine light came on three days ago and the multifunction display said to check engine electronics. The car ran the same as before the light came on. I started the car yesterday, and when I went to put the car in reverse to back up, a brief message flashed on multidisplay that XXS Disabled and the car shut off. I am not positive what the XX was before the S as it flashed so quickly, I thought maybe ERS, but it may have been CPS. I can not get the message to come back up, and now the car just cranks over but will not start.

From what I read so far, it could be the crank sensor or fuel pump. I am leaning towards crank sensor, but wanted to see what advice may be out there. I would like to test the crank sensor, but not sure of how to do it. Would it measure any Ohms, produce voltage, etc if I put a meter on it? Also, would it put a message on the multidisplay if it went bad?

Thanks for any help.