🏷️ Basic Information Identification Make: Mitsubishi Model: Sigma Model Generation: Second Generation (ES/ES-S/GSi/GSi-S) Model Years Covered: 1991-1995 Codes Chassis Code: F15A, F17A, F25A, F27A Engine Codes Covered: 6G71, 6G72, 6G73 👋 Introduction Market Position Market Position: The Mitsubishi Sigma, known in some markets as the Mitsubishi Diamante, was positioned as a mid-size luxury sedan/coupe, competing with established players like the Toyota Camry/Lexus ES, Honda Accord/Acura Vigor, and Nissan Maxima/Infiniti J30. It offered a blend of performance, comfort, and distinctive styling. Competitive Analysis Competitive Analysis: The Sigma aimed to differentiate itself through its advanced (for the time) V6 engine options, sophisticated available all-wheel-drive (AWD) system, and a premium interior. Its styling was often considered more angular and assertive than some competitors. Key Features Key Features: Available V6 engines, Optional All-Wheel Drive (AWD), Independent Rear Suspension, Available Anti-lock Braking System (ABS), Premium Interior Appointments, Sophisticated Styling. 📋 Manual Details Coverage Areas Coverage Areas: Mechanical, Electrical, Body, Chassis, Diagnostics, Maintenance, Repair, Troubleshooting Trim Levels Covered: ES, ES-S, GSi, GSi-S, and any other regional trim variations present during the 1991-1995 model years. Page Count Page Count: Approximately 1200+ Manual Type Manual Type: Workshop Manual / Service Manual Language Language: English Format Format: Digital (likely PDF, printable) 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical, Engine Control System (ECU), Fuel System, Ignition System, Cooling System, Lubrication System, Exhaust System, Automatic Transmission, Manual Transmission, Drivetrain (FWD/AWD), Suspension (Front & Rear), Steering System, Braking System (ABS), Climate Control System, Electrical System (Wiring Diagrams), Lighting System, Audio System, Body & Trim, Body Control Module (BCM), SRS Airbag System Procedures Included Procedures Included: Routine Maintenance, Scheduled Servicing, Engine Overhaul, Transmission Service, Brake Repair, Suspension Component Replacement, Steering System Alignment, Electrical Diagnostics & Repair, HVAC System Service, Body Panel Repair, Interior Trim Removal/Installation, Fuel System Cleaning & Repair, Cooling System Flush, Exhaust System Repair, Tire Rotation & Balancing, Wheel Alignment, Clutch Replacement, Drive Axle Service, SRS System Diagnostics Technical Depth Technical Depth: Comprehensive: From basic fluid changes and component replacement to in-depth engine rebuilds, transmission overhauls, and complex electrical system diagnostics. Includes detailed troubleshooting charts, diagnostic trouble codes (DTCs), specifications, and procedures. Diagnostics Diagnostic Procedures: Detailed procedures for diagnosing engine performance issues, transmission problems, electrical faults, and HVAC system malfunctions. Includes diagnostic trouble code (DTC) interpretation for OBD-I systems. Wiring Diagrams Wiring Diagrams Completeness: Includes comprehensive, schematics for all major electrical systems, including engine management, lighting, power accessories, audio, and safety systems. 📊 Manual Specifications File Format File Format: Likely PDF, optimized for printing and digital searchability. Print Quality Print Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Binding Type Binding Type: N/A (Digital format) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Primary Engine: 3.0L SOHC V6 (6G72) Engine Variants Engine Variants: 2.0L SOHC I4 (4G63), 2.5L SOHC V6 (6G73), 3.0L SOHC V6 (6G72), 3.0L DOHC V6 (6G72) (in some higher trims/markets) Performance 2.0L I4 Horsepower: Approx. 133 hp @ 6000 RPM 2.5L V6 Horsepower: Approx. 170 hp @ 6000 RPM 3.0L Sohc V6 Horsepower: Approx. 195 hp @ 6000 RPM 3.0L DOHc V6 Horsepower: Approx. 210 hp @ 6000 RPM Torque Figures: Varies by engine. E.g., 3.0L SOHC V6: Approx. 205 lb-ft @ 4500 RPM. Fuel System Fuel System: Electronic Fuel Injection (EFI), Multi-port Fuel Injection (MPI) Cooling System Cooling System Type: Pressurized, liquid-cooled Lubrication System Lubrication System Type: Forced lubrication with oil pump and filter Emissions Control Emissions Control Features: Catalytic Converter, Exhaust Gas Recirculation (EGR), Oxygen Sensors 🔧 Transmission Standard Standard Transmission: 4-Speed Automatic Transmission Optional Optional Transmission: 5-Speed Manual Transmission (less common, often paired with I4 or smaller V6) Features Transmission Features: Sportronic (sequential shifting) on some automatic models, Electronic Control Unit (ECU) management for shift points, available All-Wheel Drive (AWD) system (often designated as 'ECS' or similar). Fluid Specifications Automatic Transmission Fluid Spec: Diamond SP III or equivalent DEXRON III/MERCON Fluid Capacities Automatic Transmission Fluid Capacity: Approx. 7.5 - 8.5 Liters (dry fill) 📐 Dimensions Exterior Wheelbase: Approx. 110.2 inches (2799 mm) Length: Approx. 191.3 inches (4860 mm) Width: Approx. 70.5 inches (1790 mm) Height: Approx. 56.3 inches (1430 mm) Weights Curb Weight: Approx. 3300 - 3700 lbs (1497 - 1678 kg), depending on configuration. Gross Vehicle Weight Rating: Typically around 4500 - 4800 lbs (2041 - 2177 kg). Cargo Trunk Volume: Approx. 15.5 cubic feet (0.44 cubic meters) Wheels Tires Wheel Bolt Pattern: 5x114.3 mm (5x4.5 inches) Standard Tire Size: P205/60R15 or P215/55R16 (depending on trim and year) 🛡️ Safety Features Ratings Safety Ratings: Likely received average to good safety ratings for its era. Specific NHTSA/IIHS ratings may vary by market and specific year/configuration. Active Features Active Features: Optional Anti-lock Braking System (ABS), Traction Control (on some AWD models), Variable Assist Power Steering. Passive Features Passive Features: Driver and Passenger Front Airbags (standard...