Vehicle Speed Sensor (VSS)

VSS is a Permanent Magnet (PM) generator mounted in transmission or transfer case. The VSS sends a pulsing signal to the control module or Digital Ratio Adapter Controller (DRAC), which passes the signal on to the control module. Control module then converts this signal into Miles Per Hour (MPH) by monitoring the time interval between pulses. Control module uses this sensor input in controlling converter clutch engagement, shift speed, etc.