Vehicle Speed Detection
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2005 Acura NSX, 2004 Acura NSX, 2003 Acura NSX-T, 2003 Acura NSX, and 2002 Acura NSX-T. However, it is still accessible from the selected car via links, so may be relevant.
Wheel rotation speed is detected by wheel sensors, located at each wheel. See Fig 1. The signals are sent to TCS control unit, which compares each wheel's speed and determines whether traction control is required.