240sx S14 ABS light turns on when accelerating hard

[phusio]

Hi guys. Im new on this forum. Im from the Netherlands. Been visiting this forum for a while now. I recently purchased my first nissan. Its a S14 95 europe model standard equipped with a Sr20det and ABS. I recently found out that my ABS dash light turns on when im accelerating hard from 3rd to 4th and 5th ( most of the time when im entering the highway and accelerate to speed).

Ive been looking up on google how to diagnose the abs codes. But the ABS unit in the trunk wont let any LED blink, so theres no diagnose possible at the unit itself.
I'm no technician, but im want to know where to look for. Could this be the ABS sensor itself? And is it positioned on the diff?

Thanks

[MaximA32]

Could be an ABS speed sensor or maybe a tone ring gone bad. Have you checked to make sure that the tone ring is in good shape? If it's damaged in any way, it could cause something like this.