Inertia Fuel Shutoff Switch
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Nissan Xterra, 2002 Nissan Sentra, 2002 Nissan Quest, 2002 Nissan Pathfinder, and 2002 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect inertia fuel shut-off switch 3-pin harness connector. See Fig 1. Measure continuity between inertia fuel shut-off switch harness connector terminals No. 2 (Black wire) and No. 3 (Black/White wire). When switch is open (tripped) continuity should not exist. When switch is closed (set) continuity should exist. If continuity is as specified, inertia switch is okay. If continuity is not as specified, replace switch.