New Holland T8010 Manual page 1560

Section 55 - Electrical System, Controller - Chapter 4
Take pin 34 out of connector 351 with all other part of harness connected, the signal from the wheel speed sensor
can be checked.
The signal from the wheel speed sensor is in sinusoidal form. The sensor has to be properly installed onto
transmission (turn all way in) to give enough signal.
With key ON, but tractor not moving, the signal will show around 2.5 V DC and almost 0 V AC.
With tractor moving, the DC voltage will remain the same and the AC voltage will jump to several volts (depending
on loads in the harness). The AC voltage will increase as tractor speed goes up.
If the wheel speed sensor functions normal, check connections from the sensor to the controller.
If the wheel speed sensor does not functions normal, replace the sensor.
55-4-33