This manual covers the Diamante, a flagship sedan produced from 1990 to 2000, also known as the Sigma in Japan. This generation, identified by chassis codes including F11A through F47A, was recognized for its V6 engines, including 3.0L and 3.5L variants, and was offered in both front-wheel drive and all-wheel drive configurations. Available as a 4-door sedan or 5-door wagon, the Diamante was lauded for its refinement and performance, earning a spot on Car and Driver's 10 Best lists in 1991 and 1992. Its engineering quality and reliability were key selling points, positioning it as a competitive luxury vehicle in its market segment.
This comprehensive Service Repair Workshop Manual provides in-depth information for the Diamante, covering model years 1990 through 2000 globally. It details all major systems, including powertrain, chassis, body, and electrical components, offering step-by-step repair instructions, troubleshooting guides, routine maintenance procedures, and essential technical specifications. With over 1500 pages of factory-authored content, this manual is designed to assist independent auto service professionals and experienced DIY mechanics in accurately maintaining and repairing the vehicle, ensuring optimal performance and longevity. Detailed diagrams, illustrations, and wiring schematics are included to facilitate understanding.
Generation:
First Generation (JDM: Sigma, Export: Diamante)
Chassis Codes:
F11A, F12A, F13A, F15A, F17A, F21A, F25A, F27A, F31A, F36A, F41A, F46A, F47A
Target Audience:
Independent auto service professionals, experienced DIY mechanics, and car owners seeking detailed repair and maintenance information.
Value Proposition:
Provides dealership-level technical information, enabling cost savings on repairs and maintenance. More comprehensive than generic online guides.
Accuracy:
Vehicle-specific, factory-authored content ensuring accuracy.
Comprehensiveness:
Covers all major systems and procedures for the specified model years.
Usability:
Easy-to-follow, step-by-step instructions with clear visuals.
Digital Format:
PDF format allows for easy viewing, searching, and printing of specific pages.
Model Years Covered:
1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
Regions Covered:
Global (North America, Japan, Europe, Australia etc., based on common service practices)
Type:
Service Repair Workshop Manual
Powertrain:
Engine Mechanical, Engine Electrical, Fuel System, Emission Control System, Clutch System, Manual Transaxle System, Automatic Transaxle System, Driveshaft and Axle
Chassis:
Suspension System, Steering System, Brake System
Body And Electrical:
Body (Interior and Exterior), Body Electrical System, Heating, Ventilation, Air Conditioning (HVAC), Restraint System (Airbags, Seatbelts)
Repair Procedures:
Step-by-step repair instructions for all major components and systems
Troubleshooting:
Diagnostic procedures and troubleshooting guides for common issues
Maintenance:
Routine maintenance tasks, fluid changes, filter replacements, tune-ups
Technical Specifications:
Torque specifications, clearances, fluid capacities, electrical resistance values
Depth:
Comprehensive coverage from basic maintenance to advanced diagnostics and repairs, suitable for professional mechanics and knowledgeable DIYers
Illustrations Diagrams:
Detailed diagrams, illustrations, and wiring schematics
Printability:
Printable pages (individual or full manual)
Readability:
Clear and concise text with high-resolution diagrams
Binding:
N/A (Digital PDF)
Paper Quality:
N/A (Digital PDF)
Operating Systems:
Compatible with all versions of Windows and macOS
Software Requirements:
Adobe PDF Reader
Engine Options:
6G72 (3.0L V6 SOHC/DOHC), 6G74 (3.5L V6 SOHC/DOHC)
Horsepower Torque Ranges:
Varies by engine and year, typically 140-210 hp and 170-250 lb-ft of torque (specific values detailed within the manual).
Fuel Delivery:
Multi-point Fuel Injection (MPI)
Ignition System:
Electronic Ignition (Distributor-based or Distributorless depending on year/market)
Cooling Type:
Pressurized liquid cooling system
Oil Capacity Viscosity:
Specific capacities and SAE viscosities (e.g., 5W-30, 10W-30) provided for each engine variant within the manual.
Manual Transmission Options:
Typically 5-speed manual transaxle (e.g., F5M33, W5MG1 for performance variants)
Automatic Transmission Options:
Typically 4-speed automatic transaxle (e.g., F4A51, V4A51 with INVECS-II Sport Mode for later models)
Drive System:
Front-Wheel Drive (FWD) and All-Wheel Drive (AWD) with viscous coupling center differential (often on V6 variants).
Atf Type:
Specific ATF types (e.g., DIA-QUEEN ATF SP-III or equivalent) for automatic transmissions are detailed in the manual.
Mtf Type:
Manual transmission gear oil specifications are listed.
Body Styles:
4-door Sedan, 5-door Wagon/Wanderer (market dependent)
Wheelbase:
Approx. 2700-2750 mm (106.3-108.3 in)
Length:
Approx. 4750-4850 mm (187.0-190.9 in)
Width:
Approx. 1780-1790 mm (70.1-70.5 in)
Height:
Approx. 1420-1470 mm (55.9-57.9 in)
Curb Weight:
Approx. 1450-1700 kg (3197-3748 lbs), varies by engine, drivetrain, and trim.
Crash Test Results:
Official crash test ratings from agencies like NHTSA or IIHS are not readily available for all model years/markets, but the manual covers safety system repairs. Mention of airbag deployment procedures suggests presence of SRS systems.
Braking System:
Anti-lock Braking System (ABS) available on most models.
Traction Control:
Traction Control System (TCS) available on some higher-trim models.
Airbags:
Driver and front passenger airbags (SRS - Supplemental Restraint System) standard on later models.
Seat Belts:
Pre-tensioner seatbelts on front seats.
Audio System:
Factory-installed audio systems (cassette, CD player, radio) with speaker configurations varying by trim. Manual covers repair and diagnosis.
Climate Control:
Manual or automatic climate control systems, detailed in HVAC section.
Cruise Control:
Electronic cruise control system available on many models.
No Modern Connectivity:
As a 1990s vehicle, lacks modern Bluetooth, USB, or smartphone integration. Manual covers factory radio and antenna systems.
Oil Filter Change:
Recommended every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, whichever comes first. Specifics in manual.
Spark Plug Replacement:
Intervals vary by plug type (conventional, platinum, iridium); typically 30,000-100,000 miles. Manual provides specific recommendations.
Timing Belt Replacement:
Critical for V6 engines. Recommended every 60,000-90,000 miles (96,000-145,000 km). Manual details procedure and parts.
Coolant Type:
Ethylene glycol based coolant, typically a 50/50 mix with distilled water. Specifics in manual.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid. Manual specifies exact type and procedure.
Power Steering Fluid Type:
Dexron II/III ATF or specific power steering fluid, as per manual.
Common Problems:
Refer to manual for detailed troubleshooting, but common issues might include CV joint wear, minor electrical gremlins, HVAC blower motor issues, and potential head gasket issues on some V6 variants if maintenance is neglected.
Manufacturer:
Mitsubishi Motors Corporation (Japan)
First Generation Launch:
Introduced in 1990 (1991 model year in some markets) as Mitsubishi's flagship sedan, often positioned as a luxury/executive car.
Trim Levels:
Included various trim levels such as LS, ES, GS, and higher-spec V6 models, often with different option packages.
Market Names:
Sold as Mitsubishi Diamante in most export markets and Mitsubishi Sigma in Japan.
Production Period:
1990-2006 (two generations), with this manual covering the first generation (1990-2000).
Manufacturing Locations:
Primarily manufactured in Japan.
Car And Driver 10Best:
The Mitsubishi Diamante (and its JDM counterpart, Sigma) was notably named to Car and Driver's 10 Best lists in 1991 and 1992, particularly for its V6 engine and refinement, highlighting its competitive positioning in the luxury sedan segment of its era.
