First of course make sure the sensor plug is connected.

That plug should be 3 wire and goes to the back of the tranny.
Next, take out your gauge cluster. 2 screws, the bezel, and another 3 screws. Flip it over, look at the blue plug. There are two adjacent wires, one violet/white, one white/blue. Now, jack up ONE of the front wheels so you can spin it by hand. Leave the other wheel on the ground. Turn key to ON, with multimeter in hand and someone spinning the jacked-up wheel, backprobe these two wires for a pulse. Expect 4 pulses between 0v and 5v per turn of the wheel.
Finally, clear the code with your scanner.