Vehicle Speed Sensor: Description and Operation

Vehicle Speed Sensor:

The Vehicle Speed Sensor (VSS) is a magnetic pulse generator driven by the transmission speedometer gear.
The VSS produces 16 AC signals per revolution and sends this signal to the Transmission Electronic Control Unit (TECA). The TECA converts this signal to a vehicle speed value and stores that value in RAM memory.
The TECA uses this value to aid in controlling torque converter lock-up, shift scheduling, and capacity.