The Mazda Millenia, first introduced in 1994, represents Mazda's foray into the luxury sedan segment, positioned as the brand's flagship model during its production run from 1994 to 2002. This first-generation (JA) model is distinguished by its unique styling and innovative powertrain options, including the advanced 3.0L V6 Miller Cycle Supercharged engine, which offered a compelling alternative to established luxury marques. The Millenia aimed to compete with prominent luxury sedans of its era, offering features such as an available premium audio system and a refined interior, all contributing to its appeal as a sophisticated and technologically forward vehicle. This comprehensive repair service manual provides essential information for maintaining and repairing the 1994 Mazda Millenia. It covers a wide array of systems, including the engine mechanicals for both the 1.8L Miller Cycle V6 and 2.5L V6, engine control systems, fuel, ignition, exhaust, cooling, and lubrication systems. Detailed procedures are outlined for the transmission, drivetrain, suspension, steering, brakes, and electrical systems, complete with wiring diagrams, fuses, and relays. The manual also addresses HVAC, body panels, and interior trim, offering factory-level detail suitable for professional technicians and experienced DIY mechanics to ensure optimal performance and longevity of the vehicle.