Output Shaft Speed Sensor
On models equipped with A/T, output shaft speed sensor generates pulses when output shaft rotates. See Fig 1 . Output shaft speed sensor input is used by Powertrain Control Module (PCM) to determine vehicle speed and distance traveled.
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.