🏷️ Basic Information

Make:

Mitsubishi

Model:

Diamante

Year:

2003

👋 Introduction

Market Position:

The 2003 Mitsubishi Diamante was positioned as a premium sedan, offering a blend of comfort, performance, and luxury within its segment. This manual targets owners and independent repair facilities seeking accurate, official repair data.

Competitive Analysis:

Competed against vehicles like the Toyota Avalon, Buick LeSabre, and domestic luxury sedans. The availability of a comprehensive software manual provides a distinct advantage for maintenance and repair compared to fragmented online resources or outdated printed manuals.

Key Features:

Officially licensed content, convenient online access, detailed diagnostic procedures, extensive coverage of all vehicle systems, cost savings for DIY repairs.

📋 Manual Details

Manual Type:

Official Service and Repair Manual Software

Coverage Areas:

Comprehensive service, repair, diagnostics, and maintenance for the 2003 Mitsubishi Diamante.

Format:

Online Software (Web Browser Access)

Access Duration:

1 Year (with option for extended access)

Language:

English

📖 Manual Coverage

Systems Covered:

Engine (mechanical, electrical, diagnostics), Transmission (automatic, manual, diagnostics), Drivetrain (FWD, AWD options), Suspension (front, rear, components), Steering System, Braking System (ABS, EBD), HVAC System (heating, air conditioning, climate control), Fuel System, Exhaust System, Electrical System (wiring diagrams, components, modules), Body and Chassis, Interior Components, Safety Systems (airbags, seatbelts), Diagnostic Trouble Codes (DTCs).

Procedures Included:

Scheduled maintenance, routine servicing, inspection procedures, diagnostic troubleshooting, component removal and installation, component repair and overhaul, wiring harness repair, fluid replacement, brake service, suspension component replacement, engine tune-ups, exhaust system repair, HVAC system servicing, electrical system diagnosis, body panel repair, interior trim removal/installation.

Technical Depth:

Factory-level technical information, including detailed diagnostic procedures, torque specifications, electrical schematics, component testing, and rebuild procedures. Suitable for both DIY enthusiasts and professional technicians.

📊 Manual Specifications

Compatibility:

Compatible with PC, Laptop, Smartphone, Tablet via web browser.

Data Source:

Licensed OE (Original Equipment) materials from RepairSurge.

Interactivity:

Push-button access to information, search functionality.

⚙️ Engine Specifications

Engine Type:

6G72 V6 SOHC (3.0L)

Displacement:

2972 cc (3.0 Liters)

Horsepower:

167 hp @ 5,500 rpm (estimated for 2003 US Market)

Torque:

184 lb-ft @ 4,500 rpm (estimated for 2003 US Market)

Fuel Injection:

Multi-port Fuel Injection (MPI)

Coolant Type:

Mitsubishi Diaqueen Super Long Life Coolant (or equivalent HOAT, typically pink or red) - Capacity approx. 7.5 Liters (7.9 US Quarts)

Oil Type:

SAE 5W-30 API SM or SN - Capacity approx. 4.5 Liters (4.8 US Quarts) with filter change.

Ignition System:

Distributorless Ignition System (DIS) with Ignition Coils (typically 3 coils for 6 cylinders, firing in pairs).

🔧 Transmission

Type:

4-speed Automatic Transmission (INVECS-II)

Fluid Type:

Mitsubishi Genuine ATF SP-II or SP-III (or equivalent DEXRON-III/MERCON) - Capacity approx. 3.7 Liters (3.9 US Quarts) for change.

Type:

All-Wheel Drive (AWD) System (Active All-Wheel Control - ACT)

Transmission Features:

Electronically controlled gear shifting, sport mode.

📐 Dimensions

Length:

Approx. 192.1 inches (4879 mm)

Width:

Approx. 71.5 inches (1816 mm)

Height:

Approx. 56.1 inches (1425 mm)

Curb Weight:

Approx. 3,570 - 3,700 lbs (1620 - 1680 kg), depending on trim and drivetrain.

Wheelbase:

Approx. 107.1 inches (2720 mm)

Wheel Size:

16-inch or 17-inch alloy wheels

Tire Size:

Commonly 215/60R16 or 225/55R16, depending on trim and year. Check specific vehicle.

Bolt Pattern:

5x114.3 mm (5x4.5 inches)

🛡️ Safety Features

NHTSA Front Impact Driver:

Not rated for 2003 (IIHS provided ratings were more common for this era). Check specific vehicle records.

NHTSA Front Impact Passenger:

Not rated for 2003 (IIHS provided ratings were more common for this era). Check specific vehicle records.

Active Safety Features:

Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD) on some models.

Passive Safety Features:

Front airbags, Side-impact airbags (optional), Crumple zones, Seatbelt pretensioners.

💡 Technology Features

Infotainment System:

Available premium audio systems, CD player, cassette player (early models), and potentially a rudimentary navigation system on higher trims.

Driver Assistance Features:

Cruise control. Some advanced features like traction control may have been optional.

Comfort Features:

Automatic climate control, power seats, heated seats, power windows and locks, sunroof (optional).

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first, using synthetic or synthetic blend oil. Check manual for severe driving conditions.

Engine Air Filter:

Inspect every 7,500 miles (12,000 km), replace as needed or at approx. 30,000 miles (48,000 km).

Cabin Air Filter:

Replace as needed, typically annually or every 15,000 miles (24,000 km).

Transmission Fluid Change:

Inspect fluid condition regularly. Replacement interval varies; often recommended around 60,000-100,000 miles (96,000-160,000 km) or as per severe service schedule. The manual will provide precise guidance.

Spark Plugs:

Platinum or Iridium spark plugs, typically good for 100,000 miles (160,000 km). Consult manual for exact type and replacement procedure.

Power Steering Fluid:

Mitsubishi Electric Power Steering Fluid or Dexron-III ATF.

Brake Fluid:

DOT 3 or DOT 4 brake fluid.

Known Issues:

Potential issues include: transmission solenoid issues, ABS sensor failures, engine coolant leaks (especially hose connections), interior electronic component malfunctions, and exhaust system corrosion. The manual would provide detailed diagnostics for these.

Towing Capacity:

Not recommended for towing. The Diamante is a passenger car designed for comfort and performance, not heavy towing.

📚 Vehicle History

Brand Heritage:

Mitsubishi, a Japanese automotive manufacturer with a long history, known for its diverse product range from passenger cars to SUVs and trucks. The Diamante represented Mitsubishi's foray into the large sedan segment.

Model Evolution:

The Diamante was introduced in the North American market in 1991 as a luxury sedan. The 2003 model year represents the second generation of the Diamante, which debuted for the 1997 model year, featuring updated styling, improved performance, and enhanced features.

Production Location:

Produced in Japan.

Production Years:

1991-2004 (North American market).

🏆 Awards & Recognition

Recognitions:

While specific awards for the 2003 model year are less documented than newer vehicles, the Diamante consistently aimed for a premium positioning, often reviewed favorably for its quiet ride and comfortable interior by automotive journalists of its era.