Cutlass Supreme V6-3100 3.1L MFI VIN M (1994)
Vehicle Speed Sensor: Description and Operation
CIRCUIT OPERATION
The Vehicle Speed Sensor (VSS) is a gear-driven Permanent Magnet Generator housed in the vehicle's Transaxle. This sensor generates a sine
wave output with a frequency proportional to vehicle speed. The Powertrain Control Module (PCM) converts this signal to an output that is
switched to ground at a frequency of 4000 pulses per mile at the CKT 389 output. This output is pulled up to 5 volts or greater by the components
that use this speed signal as an input.