Just to be clear, if you are sitting still and increase RPMs above 2,500 the ABS light comes on?
So no movement of vehicle is required.
This would be a vibration issue, wiring, could be alternator issue but long shot.
If vehicle has to be moving, and I would think you would have mentioned speed vs RPM if that was the case, then could be a wheel sensor.
There is a sensor in each wheel hub, it isn't serviceable, but the wire connector for each one is, so check those.
The ABS system uses a Speed sensor on transmission that is also used by the computer, speedometer and cruise control.
Then it has a speed sensor on each hub/wheel
It compares the speed at speedometer and at each wheel to determine if a wheel is spinning slower than it should, i.e. starting to lockup, it then pulses the brake line going to that wheel, this prevents wheel from locking up.
ABS is the automated version of what race car drivers learned a long long time ago, pulsing the brake pedal will prevent wheel lock up and slow you down much quicker than direct pressure.
Last edited by RonD; 01-27-2016 at 09:34 PM.