Checking The Park/Neutral Position Switch

Purpose:
Signals the Powertrain Control Module (PCM) of gear selection.

Operation:
On vehicles equipped with automatic transmissions, the park/neutral switch indicates if the transmission is in NEUTRAL, PARK, or a DRIVE GEAR. Based on input from this switch the PCM will adjust fuel injector pulse width, ignition timing advance, and idle speed.

Check the service manual for the proper procedures and specifications for your particular vehicle.