Vehicle Speed Sensor
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Vehicle Speed Sensor (VSS) is a magnetic pick-up that is mounted to transaxle case and driven by gear on differential. Pulse signals are sent through speedometer (also known as speedometer sensor) in combination meter to PCM.
Courtesy of MAZDA MOTORS CORP.