Code 24, Vehicle Speed Sensor (VSS) SATURN (1991-92): Notes

Fig 1: Code 24, VSS Circuit Diagram (Saturn 1991-92)

Courtesy of GENERAL MOTORS CORP.

Vehicle speed values are provided by vehicle speed sensor (VSS). Sensor is a permanent magnet (PM) generator mounted on differential areas of transmission converter housing. PM generator produces a pulsing voltage whenever vehicle speed above 3 MPH. These pulses occur 16 times per each revolution of differential housing and are translated to provide vehicle speed in miles per hour.

Code 24 will set if VSS indication is less than 1 MPH, engine speed is above idle, MAP indication is less tan .5 volts or vehicle is not in park or neutral.