Vehicle Speed Sensors
The vehicle speed sensor (VSS) measures transmission/transaxle output or wheel speed. The ECM uses this information to modify engine functions such as ignition timing, air/fuel ratio, transmission shift points, and to initiate diagnostic routines.
What happens when a VSS goes bad?
One of the most common signs of a bad speed sensor is abnormal automatic transmission operation. If the VSS is faulty, the transmission may exhibit symptoms such as delayed shifts, hard shifts, and limited gear operation.
Where is the VSS sensor located?
The vehicle speed sensor, or VSS, is located near the transmission's output shaft. The specific placement of the sensor allows the sensor to detect, and report, to the engine's computer through attachment cabling, the rotation and speed of the shaft.
