Passport LX 2WD V6-3.2L SOHC (6VD1) (1997)
Vehicle Speed Sensor: Description and Operation
The Vehicle Speed Sensor (VSS) generates a signal for the speedometer. The speedometer consists of its own speed sensor, an ammeter (to move the
needle), stepper motor (to turn the odometer) and a driving circuit (printed circuit board).
The VSS is mounted to the transmission. The transmission pinion shaft generates four pulses per one rotation. The rate at which the pulses are generated
indicates the vehicle speed. The speed sensor in the speedometer uses the pulses to control how far and fast the needle moves and to send vehicle speed
information (4096 pulses per mile) to the Engine or Powertrain Control Module (ECM or PCM) (ECM with M/T or PCM with A/T) and the cruise
control unit.