This manual covers the 4 Series, specifically focusing on vehicles equipped with Electronic Diesel Control (EDC) engines, produced up to 1996. The 4 Series, introduced in 1995, marked a significant advancement in heavy-duty truck and bus offerings, known for their robust engineering, reliability, and durability. This series features a range of powerful inline 6-cylinder and V8 diesel engines, including the DSC 9, DSC 11, DSC 12, and DSC 14 families, which were available in various horsepower variants. The EDC system, a key technological feature of this era, precisely manages fuel injection for optimal performance, fuel economy, and emissions control, contributing to a reputation for quality and efficiency.

This technical service manual provides comprehensive information for owners, fleet maintenance personnel, and technicians working with the 4 Series EDC systems. It details the engine management system, including sensors, actuators, and control modules, along with extensive wiring diagrams for electrical systems. The manual offers in-depth guidance on fault diagnostics, including detailed fault code lists and step-by-step troubleshooting procedures for common and complex EDC issues. By understanding the system operation and utilizing the diagnostic capabilities outlined, users can effectively maintain and repair their vehicles, minimizing downtime and ensuring optimal operational performance.