Ignition Switch
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2000 Nissan Xterra, 2000 Nissan Sentra, 2000 Nissan Quest, 2000 Nissan Pathfinder, and 2000 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
ECM detects when ignition switch is in ON or START position. When ECM receives voltage signal for START position, it will actuate injectors and initiate ignition timing sequence and other functions, including EGR control override during start-up.