This comprehensive service and repair manual for the Mitsubishi Sigma Diamante, covering model years 1991 to 1995, provides detailed instructions and illustrations for maintaining, servicing, diagnosing, and repairing your vehicle. The manual includes a wealth of information, covering everything from engine overhauls and rebuilding to brake servicing, sunroof repair, and timing belt replacement. You'll find detailed wiring diagrams, troubleshooting guides, and diagnostic trouble tree charts to help you pinpoint and resolve any issues. Learn about computer diagnostics, firing orders, and detailed specifications for every model covered in the manual. This manual also includes factory maintenance schedules and charts, serpentine belt routings with diagrams, brake servicing procedures, driving concerns, complete torque specifications, U-joint and CV-joint service procedures, complete wiring diagrams, hundreds of illustrations, and vacuum diagrams. This is not generic repair information; it's specifically designed for the Mitsubishi Sigma Diamante, providing the same in-depth instructions used by dealership technicians. The manual offers step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications to guide you through every repair with ease. Save time and money by performing your own repairs with this easy-to-use manual. The clear and concise instructions make it a valuable resource for mechanics of all skill levels.

The Mitsubishi Sigma Diamante, a mid-size sedan produced from 1989 to 1995, marked a significant step forward for the Japanese automaker in the North American market. Replacing the aging Galant Sigma, the Diamante aimed to compete directly with luxury sedans like the Toyota Cressida and the Nissan Maxima. This ambition was reflected in its design, which incorporated sharp lines and a more refined aesthetic compared to its predecessor. While the Sigma Diamante was offered in both front-wheel drive and all-wheel drive configurations, it was the latter that cemented its reputation as a capable and comfortable cruiser. The Diamante's suspension was tuned for a smooth ride, prioritizing comfort over sportiness, and its spacious interior featured high-quality materials and amenities that were unheard of in its class at the time. Powering the Diamante was a range of four-cylinder and six-cylinder engines, delivering a balance of performance and fuel efficiency. The most popular engine choice was the 3.0-liter V6, known for its smooth power delivery and ample torque. The Diamante also stood out with its optional "Active Aero" package, which included a rear spoiler and a unique front air dam designed to improve aerodynamic efficiency and enhance stability at high speeds. While the Sigma Diamante never achieved the same level of commercial success as other midsize sedans of its era, it remains a significant car in Mitsubishi's history, showcasing the automaker's commitment to entering the premium segment. The car's combination of refined styling, comfortable ride, and powerful engines made it a compelling option for buyers seeking a luxurious driving experience at a more accessible price point.