Market Segment:
Mid-size luxury sedan, positioned as Mitsubishi's flagship sedan for many markets.
Competitors:
Competed against vehicles like the Toyota Avalon, Nissan Maxima, Honda Accord (higher trims), and to some extent, entry-level luxury sedans from other brands.
Distinguishing Features:
Known for its comfortable ride, spacious interior, sophisticated styling (for its time), and a focus on refinement. Often featured advanced options like all-wheel drive and a refined V6 engine.
Value For Owner:
Enables owners to perform routine maintenance, troubleshoot issues, and undertake significant repairs, potentially saving considerable costs on professional servicing. The detailed procedures and diagrams empower DIY enthusiasts.
Target Audience:
Professional technicians, experienced DIY mechanics, and dedicated owners seeking in-depth knowledge for repair and maintenance.
Engine Systems:
Engine mechanicals, cooling, lubrication, fuel delivery, ignition, emission controls, engine electricals, intake and exhaust systems.
Transmission Systems:
Automatic transmission (operation, diagnosis, overhaul) and Manual transmission (operation, diagnosis, overhaul).
Chassis Systems:
Front and rear suspension, steering system, brake systems (service and parking), wheels and tires.
Body And Interior Systems:
Body construction, exterior trim, interior trim, HVAC (Heating, Ventilation, and Air Conditioning), and body electrical systems.
Maintenance Procedures:
Scheduled maintenance, fluid changes, filter replacements, lubrication, inspections.
Repair Procedures:
Detailed step-by-step repair instructions for all major vehicle components, including engine overhaul, transmission rebuild, suspension component replacement, brake service, electrical diagnostics, and body panel repair.
Diagnostic Procedures:
Troubleshooting guides, symptom-based diagnostics, electrical circuit diagrams, component testing procedures, fault code interpretation.
Technical Specifications:
Torque specifications, tightening sequences, fluid capacities and types, electrical component resistance values, diagnostic parameters.
Body And Paint Repair:
While primarily focused on mechanical and electrical aspects, comprehensive manuals often include sections on body repair, panel alignment, and basic paintwork procedures.
Depth:
Comprehensive, covering everything from basic fluid checks and filter changes to complete engine and transmission rebuilds, complex electrical diagnostics, and bodywork.
Wiring Diagrams:
Comprehensive electrical wiring diagrams for all systems, including engine control, chassis electrical, lighting, and accessories, are typically included.
Printability:
Fully printable (selected pages or entire manual), high-resolution diagrams and images.
Binding Type:
N/A (Digital Download - PDF)
Paper Type:
N/A (Digital Download - PDF)
Illustration Type:
Detailed exploded views, step-by-step procedure illustrations, wiring diagrams, schematics.
Diagram Detail:
High-quality, detailed exploded views and diagrams are a hallmark of factory service manuals, crucial for component identification and assembly/disassembly guidance.
Engine Options:
• 2.5L V6 (6G73)
• 3.0L V6 (6G72)
• 3.5L V6 (6G74)
2.5L V6 6G73 Specs:
Displacement: 2498cc, Configuration: SOHC V6, Horsepower: Approx. 160-170 hp, Torque: Approx. 155-165 lb-ft. (Varies by market and year).
3.0L V6 6G72 Specs:
Displacement: 2972cc, Configuration: SOHC V6, Horsepower: Approx. 195-210 hp, Torque: Approx. 190-200 lb-ft. (Varies by market and year).
3.5L V6 6G74 Specs:
Displacement: 3497cc, Configuration: SOHC V6, Horsepower: Approx. 215-240 hp, Torque: Approx. 225-240 lb-ft. (Varies by market and year).
Fuel Delivery:
Electronic Fuel Injection (EFI) / Multi-Point Fuel Injection (MPI).
ECU:
Engine Control Unit (ECU) for fuel and ignition timing management.
Ignition System:
Distributor-based ignition system for earlier models, potentially coil-on-plug or distributorless ignition systems for later models within the 1995-2005 range. The manual will detail diagnostics and component replacement for the specific system.
Transmission Options:
Primarily Automatic Transmissions (e.g., INVECS-II Sport Mode) and some markets/trims may have offered a Manual Transmission.
All Wheel Drive:
Available on select models, often paired with the V6 engines.
Automatic Transmission Features:
Electronic control, 'Sport Mode' with adaptive shift logic.
Wheelbase:
Approximately 2,760 mm (108.7 in)
Length:
Approximately 4,890 mm (192.5 in)
Width:
Approximately 1,780 mm (70.1 in)
Height:
Approximately 1,430 mm (56.3 in)
Curb Weight:
Varies by engine and drivetrain, generally ranging from 1,500 kg to 1,700 kg (3,300 lbs to 3,750 lbs).
Gross Vehicle Weight Rating:
Refer to vehicle's VIN plate or owner's manual for specific GVWR.
NHTSA Front Impact Rating:
Information for this specific model and year range may vary by market and require specific testing reports. Generally, vehicles of this era offered moderate to good frontal protection.
Antilock Braking System:
Standard on most models, ABS helps prevent wheel lock-up during braking.
Traction Control:
Optional on some models, helps prevent wheel spin during acceleration.
Airbags:
Driver and front passenger airbags were standard. Side airbags were optional on later models.
Seatbelts:
Three-point inertia-reel seatbelts for all occupants.
Child Seat Anchors:
LATCH or ISOFIX anchor points may be present on later models within this range, as mandated by evolving safety standards.
Audio System:
Factory-installed AM/FM stereo with cassette and CD player, premium sound system options were available.
Climate Control:
Automatic climate control and manual climate control systems were offered, depending on trim level.
Cruise Control:
Standard on most trims.
Keyless Entry:
Available on higher trim levels.
Power Features:
Power windows, power door locks, power mirrors, and power seats were common features, especially on higher-spec models.
Oil Change Interval:
Typically every 5,000 to 7,500 miles (8,000 to 12,000 km) or 6 months, whichever comes first, depending on driving conditions and oil type.
Timing Belt Replacement:
Crucial maintenance item for the 6G7x V6 engines. Recommended replacement interval is typically around 60,000 to 90,000 miles (96,000 to 145,000 km). Failure can cause catastrophic engine damage.
Coolant Flush:
Recommended every 2 to 3 years or 30,000 to 50,000 miles (48,000 to 80,000 km).
Engine Oil Type:
API SG or higher, SAE 5W-30 or 10W-30 recommended (refer to manual for exact specifications based on climate).
Automatic Transmission Fluid Type:
Mitsubishi Diaqueen ATF-SPII or equivalent (e.g., Dexron III/Mercon compatible fluids, but always verify).
Coolant Type:
Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. Use of 'Long Life' or 'Super Long Life' coolants may be specified for later models.
Brake Fluid Type:
DOT 3 or DOT 4, depending on the specific system design. Crucial for proper braking performance and safety.
Power Steering Fluid Type:
Typically ATF Dexron II/III compatible fluid or specific power steering fluid; refer to manual for exact specification.
Common Wear Items:
Suspension components (ball joints, tie rods, bushings), wheel bearings, CV joints (especially on AWD models), and exhaust system components can be prone to wear over time.
Engine Specific Concerns:
While generally robust, early models of the 6G7 engines can experience valve stem seal wear leading to oil consumption, and ignition system components (coil packs, spark plug wires) require regular inspection.
Transmission Potential Issues:
Automatic transmissions, particularly with high mileage, may exhibit delayed shifts or slipping, often due to fluid degradation or internal wear. Regular fluid changes are critical.
Emission System Maintenance:
The manual covers diagnosis and repair of emission control systems, including EVAP, EGR, and catalytic converters, essential for maintaining compliance and performance.
Mitsubishi Legacy:
Mitsubishi has a long history of producing reliable and innovative vehicles, from small economy cars to robust SUVs and performance models.
Diamante Lineage:
The Diamante was based on the platform shared with the Mitsubishi Galant, but offered a more upscale and spacious experience. It was Mitsubishi's flagship sedan, aiming to compete in the larger sedan segment. In Japan, it was marketed as the Mitsubishi Debonair.
Platform Sharing:
The Diamante shared its platform with the Mitsubishi Galant, but was positioned higher in the market with a longer wheelbase and distinct styling. This allowed for greater interior space and a more refined ride.
Manufacturing Location:
Primarily manufactured in Japan.
Production Years Global:
1990-2005 (across two generations). This manual specifically covers the second generation, produced from 1995 to 2005.
Automotive Journal Awards:
While specific year-by-year awards are hard to pinpoint without detailed historical data, the Diamante was generally well-regarded for its comfort and value in its segment during its production run.
Consumer Reports Reviews:
Consumer Reports reviews from the era often highlighted its comfortable ride and strong V6 engines but sometimes noted issues with reliability in certain areas, typical for many vehicles of its time. Consult specific model year reviews for detailed insights.
