Engine Controls - Theory & Operation: Introduction

NOTE: Vehicles are equipped with an OBD-II diagnostic system, with an OBD-II Data Link Connector (DLC) located under left side of instrument panel, next to steering column. Additional OBD-II information not available at time of publication.

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.