Vehicle Speed Sensor Signal Buffer: Description and Operation

Vehicle Speed Signal (VSS) Buffer Module




The VSS buffer module (1) is an electronic device. The VSS buffer module processes inputs from the vehicle speed sensor and outputs various signals. The VSS buffer module outputs a 4000 pulse per mile signal. This signal is used by the PCM in determining the vehicle speed. The PCM uses the vehicle speed signal input for cruise control and fuel cutoff. The VSS buffer module is matched to the vehicle based on the transmission, the final drive ratio, and the tire size. The VSS buffer module is located behind the instrument panel.