The 3 Series, produced from approximately 1987 to 1996, represents a significant generation of heavy-duty commercial vehicles, including trucks and buses, renowned for their durability and performance. This series marked a pivotal transition towards electronic controls in the heavy-duty sector, featuring advanced Electronic Diesel Control (EDC) systems for improved engine performance, fuel economy, and emissions management. The EDC technology, applied to engine families such as the 11 and 14 series with displacements of approximately 11.0 and 14.2 liters respectively, offered enhanced power delivery, torque, and responsiveness. These vehicles were engineered for demanding applications, available in various chassis configurations like 4x2, 6x2, 6x4, and 8x4, with Gross Vehicle Weight Ratings (GVWR) typically ranging from 18,000 kg to over 40,000 kg, reflecting their robust construction and capability.

This supplementary service manual provides in-depth technical information specifically for the Electronic Diesel Control (EDC) system of the 3 Series, complementing the main workshop manual. It covers the EDC system's operation, including ECU functions, sensor inputs, actuator outputs, and control strategies for engines like the DSC 11 22, DSC 14 04, DTC 11 01, and DSC 14 09. The manual details the electronically controlled fuel injection system, diagnostic procedures, fault codes, and troubleshooting guides for common EDC issues. It also includes information on electrical system components related to EDC, wiring diagrams, and step-by-step repair and replacement procedures for key EDC components, enabling technicians and owners to effectively maintain and service these sophisticated engine management systems.

The 3 Series, produced from approximately 1987 to 1996, represents a significant generation of heavy-duty commercial vehicles, including trucks and buses, renowned for their durability and performance. This series marked a pivotal transition towards electronic controls in the heavy-duty sector, featuring advanced Electronic Diesel Control (EDC) systems for improved engine performance, fuel economy, and emissions management. The EDC technology, applied to engine families such as the 11 and 14 series with displacements of approximately 11.0 and 14.2 liters respectively, offered enhanced power delivery, torque, and responsiveness. These vehicles were engineered for demanding applications, available in various chassis configurations like 4x2, 6x2, 6x4, and 8x4, with Gross Vehicle Weight Ratings (GVWR) typically ranging from 18,000 kg to over 40,000 kg, reflecting their robust construction and capability.

This supplementary service manual provides in-depth technical information specifically for the Electronic Diesel Control (EDC) system of the 3 Series, complementing the main workshop manual. It covers the EDC system's operation, including ECU functions, sensor inputs, actuator outputs, and control strategies for engines like the DSC 11 22, DSC 14 04, DTC 11 01, and DSC 14 09. The manual details the electronically controlled fuel injection system, diagnostic procedures, fault codes, and troubleshooting guides for common EDC issues. It also includes information on electrical system components related to EDC, wiring diagrams, and step-by-step repair and replacement procedures for key EDC components, enabling technicians and owners to effectively maintain and service these sophisticated engine management systems.