Ignition Timing Control System: Notes
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.
Ignition timing is controlled by ECM according to engine operating conditions, based on inputs from various sensors, including camshaft position sensor, mass airflow sensor and engine coolant temperature. Optimum ignition timing for various driving conditions is preprogrammed and stored in ECM.