This workshop service manual covers Mercury Mariner outboard motors manufactured between 2002 and 2005. These 4-stroke EFI engines are water-cooled and deliver 40 HP, utilizing a CDI ignition system and an alternator for charging. Designed for reliable performance on the water, the Mariner series offers a robust power solution for various boating applications, featuring electronic fuel injection for efficient operation and a transmission with Forward, Neutral, and Reverse gear positions. Remote steering and throttle controls provide user-friendly operation. This comprehensive manual is designed to assist owners, technicians, and mechanics in understanding, maintaining, and repairing their Mercury Mariner outboard motor. It provides detailed information on all aspects of the unit, including engine specifications, electrical systems, fuel delivery, cooling, and control mechanisms. By following the procedures and guidelines outlined within this English-language manual, users can ensure optimal performance, longevity, and safety of their Mercury Mariner outboard motor.