Electronic Concentrated Control System (ECCS): Notes
WARNING: This page is about a different car, the 1993 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Self-diagnostic system is used for diagnosing malfunctions of Electronic Concentrated Control System (ECCS) sensors and actuators. Engine Control Module (ECM) has a number of available diagnostic modes within computer.
Maxima, Pathfinder and Pickup have 5 diagnostic modes. All others have 2 modes with subdivisions. Before selecting any mode of self-diagnostics, always perform procedures described in BASIC TESTING article. Doing so prevents wasted time and false diagnostic results.