Vehicle Speed Sensor: Description and Operation

Vehicle Distance Sensor:

This sensor is located in the extension housing of the transaxle, and it generates 8 voltage pulses for every revolution of the output shaft. These pulses are sent directly to the Single Board Engine Controller (SBEC). These signals are used to determine distance traveled and vehicle speed. The SBEC also uses these signals, along with the signals from the Throttle Position Sensor (TPS), to determine the difference between a closed throttle deceleration condition and a closed throttle idle (vehicle stopped) condition.

Under idle (vehicle stopped) conditions, the SBEC sees that there are no signals being generated from the vehicle distance (speed) sensor, and it adjusts the Automatic Idle Speed (AIS) motor to maintain a desired engine idle speed. Under closed throttle deceleration, the SBEC receives signals from the vehicle distance (speed) sensor, because the vehicle is still moving, and it adjusts the AIS motor to maintain a desired MAP value.