Vehicle Speed Sensor

The Vehicle Speed Sensor (VSS) is mounted on the transmission case extension facing toward the right wheel. This sensor consists of a permanent magnet surrounded by a coil of wire. The sensor mounts into the extension and maintains a slight air gap (0.045-0.109") between itself and a rotor which is located on the differential. The VSS measures the speed of the rotor, which contains 31 teeth. As the differential rotates, an AC signal is induced in the VSS. The AC signal varies in frequency and voltage output:

• Low speed - low Hz and voltage amplitude
• High speed - high Hz and voltage amplitude

This input is used for the Torque Converter Clutch (TCC), line pressure, shift timing and torque management controls. Sensor resistance should be 1300-1950 ohms when measured at 68-212°F (20-100°C). Output voltage varies with speed from a minimum of 0.5 volt AC at 100 RPM, to more than 100 volts AC at 8000 RPM.