Vehicle Speed Sensor (VSS)

On some models equipped with 4-speed A/T, output speed sensor supplies vehicle speed and distance inputs to PCM through TCM. See OUTPUT SPEED SENSOR (OSS).

Speed and distance inputs along with TP sensor closed throttle input, determine if a closed throttle deceleration or normal throttle idle (vehicle stopped) condition exists. During deceleration, PCM controls IAC motor to maintain a desired MAP value. During idle (vehicle stopped), PCM controls IAC motor to maintain a desired idle speed.