Transmission Position Sensor/Switch: Description and Operation
TRANSAXLE [1][2]PARK/NEUTRAL SWITCH-PCM INPUTPark Neutral Switch-4 Speed Electronic Automatic Transaxle-Typical:
The [1][2]park/neutral switch is located on the transaxle housing.
It provides an input to the PCM indicating whether the automatic transaxle is in Park or Neutral. This input is used to determine idle speed (varying with gear selection) and ignition timing advance. The park neutral switch is sometimes referred to as the neutral safety switch.