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Transmission Position Switch/Sensor: Description and Operation
Park/Neutral Switch

This switch, connected to the transmission gear selector, is closed when the gear selector is in Park or Neutral. 

When the switch is closed ignition timing is retarded. 

It also is involved in the operation of the torque converter clutch and the idle speed control.

Transmission and Drivetrain > Transmission Control Systems > Sensors and Switches - Transmission and Drivetrain > Sensors and Switches - A/T > Transmission Position Switch/Sensor, A/T > Component Information > Description and Operation > Park/Neutral Switch

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