The F6N00390 ECM (Engine Control Module) is a Denso electronic control unit designed for BS6 diesel engines used in Ashok Leyland 2620, Ashok Leyland 4220, Ashok Leyland 5525, Ashok Leyland 1920, and Ashok Leyland 4620 trucks. It controls fuel injection, engine performance, and emission systems to ensure efficient operation and BS6 compliance. Designed for durability and accurate engine management in heavy-duty commercial vehicles.