Circuit Operation

The Vehicle Speed Sensor is a gear-driven Permanent Magnet Generator housed in the vehicle transmission. This sensor generates a sine wave output with a frequency proportional to vehicle speed. The Vehicle Speed Sensor Buffer converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile at the DK GRN/WHT (817 CKT) wire output. This output varies from 16 volts to battery voltage.