Manual for diagnosing HEUI (Electronic Hydraulic Unit Injector) and Common Rail electronic diesel injection systems, specifically for Navistar Ford Power Stroke engines. This manual, in Spanish, describes the sensors and actuators of electronic diesel engines, the evolution of injection systems, and the technologies developed by manufacturers such as Cummins, Caterpillar, and Detroit Diesel. It focuses on the components and operation of Ford and Navistar systems.