Vehicle Speed Sensor

Vehicle speed sensor, mounted in transmission (2WD) or transfer case (4WD), generates AC voltage pulses that represent vehicle speed. On 1991 vehicles (except Motorhome), these pulses are sent to speedometer. Speedometer converts pulses to DC voltage, then sends signals to cruise control module. On 1991 Motorhome and 1992 vehicles, AC pulses are sent to vehicle speed sensor buffer (Digital Ratio Adapter Controller, or DRAC).