Extrapolation counter
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
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.