The check engine light came on, but reader not working?

The fuse number #44 in the fuse panel under the hood. Here is a guide to help you check it and the fuse location in the images below and I have included the wiring diagrams for the ALDL connector so you can see how it works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

I would also check the wiring at the data port. Check out the images (below). Please let us know what happens.