This manual covers the 2010 Navistar MaxxForce DT, 9, and 10 engines. These engines are engineered for robust performance and reliability, suitable for a wide range of demanding applications. The detailed illustrations and step-by-step instructions provided within this guide are designed to assist users in understanding and maintaining these powerful engines, ensuring their continued optimal operation. The purpose of this diagnostic manual is to provide comprehensive guidance for servicing and repairing the specified Navistar engines. It covers essential areas including safety information, engine systems, diagnostic software operation, symptom diagnostics, system tests, and electronic control systems. This resource is invaluable for both do-it-yourself enthusiasts and experienced mechanics seeking to perform maintenance and troubleshooting procedures accurately and efficiently.