Vehicle Speed Sensor: Description and Operation

PURPOSE

The vehicle speed sensor reports road speed to the ECU. This information is used to synchronize emission systems and to adjust for various engine demands.

LOCATION

The sensor is mounted in the transaxle, near the bellhousing.

CONSTRUCTION

The sensor is a reed switch that is controlled by a rotating magnet inside to transaxle. As the magnet passes under the sensor the contacts close momentarily, resulting in a ground at the ECU.