Park/Neutral Position Signal (PNPS) Circuit
WARNING: This page is about a different car, the 1995 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
The PNPS circuit is used on vehicles with A/T. PNPS circuit monitors shift lever positions, and then inputs signal to the PCM and Transaxle Control Module (TCM). This signal affects starter engagement, air/fuel ratio, idle speed and ignition timing.