DeVille d Elegance V8-4.6L VIN Y (1998)
Powertrain Control Module: Description and Operation
Vehicle Speed Sensor (VSS)
Vehicle Speed Sensor
DESCRIPTION
The Vehicle Speed Sensor (VSS) is a pulse generator mounted in the transaxle. A toothed reluctor ring rotates near a magnetic pickup which
produces a varying voltage signal in the pickup coil. This voltage signal varies in proportion to vehicle speed and is sent to the PCM, where it is
converted to MPH.
OPERATION
The PCM uses VSS information for fuel economy calculations, idle speed control, transaxle shifts, and to control fuel under certain conditions.
CIRCUIT FAULTS
A faulty VSS may cause various transaxle and engine driveability conditions and should set a PCM Diagnostic Trouble Code. Refer to Computers
and Controls / Testing and Inspection / Procedures / Diagnostic Tables for diagnosis.
