Vehicle Speed Sensor (VSS)
WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
VSS is located on side of transaxle. Disconnect negative battery cable. Disconnect VSS connector. Rotate front wheels and measure voltage between sensor terminals. See Fig 1 . If voltmeter needle does not fluctuate, replace sensor.