Extrapolation counter

Measurement range: 0- 255

The normal value if the car is driven should be 0. The extrapolation counter calculates if the number of wheel speed changes are higher than the number allowed.

If the signal from the wheel sensor is affected by electromagnetic interference, varies too much or is affected by short intermittent open-circuit/short circuits, the control module can interpret it as a speed change and the counter will begin updating. When the control module registers that speed changes are within the permitted values the counter value will reduce again.