How does the speedometer work on 2000 grand Jeep Cherokee?

The speedometer in a 2000 Jeep Grand Cherokee operates using a vehicle speed sensor (VSS) located on the transmission. As the vehicle moves, the VSS generates a signal based on the rotational speed of the transmission output shaft. This signal is sent to the engine control module (ECM), which processes the data and sends it to the speedometer gauge, displaying the vehicle's speed on the dashboard. The speedometer needle moves in response to these signals, providing real-time speed readings to the driver.