Prizm L4-108 1.8L DOHC VIN 8 MFI (1995)
Vehicle Speed Sensor: Description and Operation
DESCRIPTION
The Vehicle Speed Sensor (VSS) is an electronic relay that is mounted on the transaxle.
OPERATION
As the transaxle turns the VSS, the VSS provides the speedometer with a vehicle speed input (voltage pulses). This input is used to drive the
speedometer. The speedometer then converts this vehicle speed input into a more precise waveform and provides the PCM and the cruise-control
module (if equipped) with its own vehicle speed input. The PCM converts this input (ground pulses) into a vehicle speed.
SENSOR CIRCUIT FAILURE
A failure in the VSS circuit should set a DTC 42.
