Vehicle Speed Sensor: Description and Operation

Description

Vehicle Speed Sensor (VSS) is hall sensor type and senses the rotating speed of differential gear mounted on transaxle.
Comparing engine speed with vehicle speed calculated based on vehicle speed sensor signal, ECM recognizes engaged gear.
And based on the information about engaged gear, ECM performs optimum fuel injection quantity correction.
VSS signal is also used in speed meter of cluster, aircon control module, BCM, etc.