Vehicle Speed Sensor (VSS)

The VSS is a pulse generator mounted in transaxle. A toothed reluctor ring rotates near a magnetic pickup which produces a varying voltage signal in pickup coil. This voltage signal varies in proportion to vehicle speed and is sent to PCM, where it is converted to mph.

The PCM uses VSS information for fuel economy calculations, cruise control, idle speed control, transaxle shifts, and to control fuel under certain conditions. A faulty VSS may cause various transaxle and engine driveability conditions and should set a PCM Trouble Code.