Section 249 (Engine Control System - Theory & Operation): Introduction
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
This article covers basic description and operation of engine performance-related systems and components. Read this article before diagnosing vehicles or systems with which you are not completely familiar. For component locations, see COMPONENT LOCATIONS in SELF-DIAGNOSTICS - 1.8L VIBE article.