Marlin: Switch Y to E1
If you followed the answer to switch steppers in firmware to the letter, but changing X for Y, this should work.
I've looked into the pins files for you and concluded that your proposed changes should work.
This leaves you with the following questions:

Is the stepper driver for E1 working?
Is there a stepper driver installed?
Is the cable working/not damaged?

Swap drivers and cables to troubleshoot the problem.