Town & Country Van AWD V6-230 3.8L VIN L SMFI (1998)
Vehicle Speed Sensor: Description and Operation
Vehicle Speed Sensor Operation
Fig 25 Park/Neutral Switch -- 4 Speed Electronic Automatic Transaxle -- Typical
OPERATION
The transaxle output speed sensor supplies the vehicle speed and distance inputs to the PCM.
The speed and distance signals, along with a closed throttle signal from the TPS, determine if a closed throttle deceleration or normal idle
condition (vehicle stopped) exists.
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Under deceleration conditions, the PCM adjusts the idle air control motor to maintain a desired MAP value.
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Under idle conditions, the PCM adjusts the idle air control motor to maintain a desired engine speed.
