Vehicle Speed Sensor

Vehicle Speed Sensor (VSS) is located in speedometer assembly. Connect an ohmmeter between sensor test terminals on back of instrument panel. See Fig 1 or Fig 2 .
Rotate speedometer cable. For each revolution of speedometer cable, sensor should make and break continuity 4 times. If ohmmeter reading does not fluctuate between continuity and no continuity or if sensor does not make and break continuity 4 times per revolution, replace sensor.

Fig 1: Vehicle Speed Sensor Connector Terminal ID (Montero)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Vehicle Speed Sensor Connector Terminal ID (Pickup & Ram-50)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.