🏷️ Basic Information

Make:

Mitsubishi

Model:

Sigma

Generation:

GD/GY (Sigma)

Chassis Codes:

GD, GY

👋 Introduction

Market Position:

The Mitsubishi Sigma (part of the Diamante family globally) was positioned as a comfortable and stylish mid-size sedan/coupe, offering a blend of performance and luxury for its era, competing against established players in the sedan market.

Competitors:

Competed with vehicles like the Toyota Camry, Honda Accord, Nissan Maxima, Ford Taurus, and Chevrolet Lumina.

Key Features:

Available in sedan and coupe body styles, powerful V6 engines, front-wheel or optional all-wheel drive, luxurious interiors for its time, advanced technology for the era (e.g., optional active-ECS suspension).

📋 Manual Details

Covered Years:

1991, 1992, 1993, 1994, 1995, 1996

Total Pages:

1441

Type:

Workshop Service Repair Manual

Language:

English

File Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, inspection, repair, timing belt, cylinder head, piston, crankshaft, connecting rods, oil pump, oil cooler.

Engine Fuel System:

Fuel injection system, fuel pump, injectors, fuel pressure regulator, throttle body, emissions control.

Engine Cooling System:

Radiator, water pump, thermostat, cooling fan, hoses, coolant specifications.

Engine Lubrication System:

Oil pan, oil pump, oil filter, oil specifications, oil pressure testing.

Ignition System:

Spark plugs, ignition coils, distributor (if applicable), ignition timing, ignition control module.

Transmission Manual:

Clutch system, manual transmission assembly/disassembly, gear ratios, clutch fluid, shift linkage.

Transmission Automatic:

Automatic transmission assembly/disassembly, torque converter, valve body, transmission fluid, transmission control module (TCM).

Drivetrain:

Driveshafts, CV joints, differential, wheel bearings, rear axle components.

Suspension System:

Front suspension components (struts, control arms, ball joints), rear suspension components (shocks, trailing arms, bushings), alignment specifications.

Steering System:

Power steering pump, steering rack/gearbox, steering column, tie rods, steering fluid.

Brake System:

Front/rear brake calipers, brake pads, brake discs/rotors, brake lines, master cylinder, ABS system (if equipped), brake fluid specifications.

Electrical System:

Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting system, horn, wipers.

Body Exterior:

Body panel removal/installation, doors, hood, trunk, bumpers, glass replacement, weather stripping.

Body Interior:

Dashboard, seats, door panels, headliner, trim pieces, carpeting.

HVAC System:

Air conditioning system, heater core, blower motor, climate control panel, refrigerant types.

Restraint Systems:

Airbag system (if equipped), seat belts, pre-tensioners.

Diagnostics Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, common fault diagnosis.

Maintenance:

Routine checks, fluid changes (oil, coolant, brake, transmission, power steering), filter replacements, spark plug replacement, belt inspections/replacement.

Repair:

Component removal, installation, disassembly, assembly, and adjustment for all major systems.

Adjustments:

Engine idle speed, ignition timing, clutch pedal free play, brake pedal height, wheel alignment.

Installation:

Installation procedures for major components and accessories.

Removal:

Removal procedures for all vehicle components.

Specifications:

Torque values, fluid capacities, clearances, wear limits, electrical specifications.

Wiring Diagrams:

Comprehensive electrical wiring schematics for all vehicle systems.

Depth:

Comprehensive, step-by-step procedures with detailed explanations, pictorial diagrams, exploded views, and photographs. Covers everything from basic maintenance to complete rebuilds and advanced diagnostics.

📊 Manual Specifications

File Format Details:

PDF, searchable text, printable pages.

Print Quality:

High-resolution, printable pages suitable for home or professional printing.

Binding Type:

Digital (PDF - Instant Download)

Paper Type:

Not applicable (digital format)

Os Compatibility:

Windows, Mac, Linux OS.

Software Requirement:

Adobe Reader (or compatible PDF viewer).

⚙️ Engine Specifications

Engine Options:

Primarily featured V6 engines. Common configurations included the 3.0L 6G72 SOHC V6 and potentially a 24-valve DOHC version (6G72 DOHC).

Horsepower Range:

Typically ranged from approximately 140 hp to over 200 hp depending on the specific engine variant and market.

Torque Range:

Torque figures varied, generally in the 170-200 lb-ft range for the V6 engines.

Fuel Delivery:

Multi-point fuel injection (MPI) or Electronic Fuel Injection (EFI).

Engine Codes:

6G72

🔧 Transmission

Standard Transmission:

Typically a 4-speed automatic transmission was standard on most models.

Optional Transmission:

A 5-speed manual transmission was likely an option on certain trims or performance-oriented models.

Drivetrain Options:

Front-wheel drive (FWD) and All-wheel drive (AWD - known as 'Full-time 4WD' in some Mitsubishi nomenclature).

📐 Dimensions

Wheelbase Sedan:

Approx. 106.3 inches (2700 mm)

Wheelbase Coupe:

Approx. 104.5 inches (2654 mm)

Curb Weight Range:

Approximately 3300 - 3600 lbs (1500 - 1630 kg), varying by body style and drivetrain.

🛡️ Safety Features

Safety Ratings:

Safety ratings from the era varied, with airbags becoming more common but ABS not always standard. Specific NHTSA/IIHS ratings for these exact years and models may be scarce.

Active Safety Features:

Anti-lock Braking System (ABS) was often optional. Traction control may have been available on higher trims or AWD models.

Passive Safety Features:

Driver and passenger front airbags (often optional on lower trims), three-point seat belts with pretensioners, reinforced body structure.

💡 Technology Features

Infotainment Features:

Basic AM/FM stereo with cassette player, optional CD player, manual or power climate control. Features were typical for the early to mid-1990s.

Driver Assistance Features:

Limited by modern standards. ABS and traction control (on some models) were the primary electronic aids.

Connectivity Features:

None by modern standards (no Bluetooth, USB, or smartphone integration).

🔧 Maintenance

Oil Change Interval:

Typically every 3,000-5,000 miles (5,000-8,000 km) or 6 months, depending on driving conditions and oil type specified in the manual.

Timing Belt Replacement:

Crucial interval for the 6G72 engine, often recommended around 60,000-90,000 miles (96,000-145,000 km) or 5-7 years. Referencing the manual is essential.

Coolant Replacement:

Generally every 2-4 years or 30,000-50,000 miles (48,000-80,000 km).

Engine Oil Type:

API SG or SH, SAE 5W-30 or 10W-30 typically recommended, depending on climate. Consult the manual for precise viscosity.

Engine Oil Capacity:

Approximately 4.5 - 5.0 US quarts (4.3 - 4.7 liters) with filter change.

Transmission Fluid Type Auto:

Mitsubishi DiaQueen ATF-SPII or equivalent Dexron-II/III compatible fluid.

Transmission Fluid Type Manual:

API GL-4 or GL-5 gear oil, SAE 75W-90.

Power Steering Fluid:

ATF Dexron-II/III compatible fluid.

Brake Fluid Type:

DOT 3 or DOT 4.

Common Issues:

Timing belt failure (due to lack of timely replacement), potential head gasket leaks, automatic transmission issues (especially with age), power window regulator failures, suspension component wear (bushings, ball joints), exhaust system corrosion.

📚 Vehicle History

Brand Heritage:

Mitsubishi has a long history in automotive manufacturing, known for reliable and sometimes technologically advanced vehicles. The Sigma represents their foray into the competitive mid-size sedan market.

Model Evolution:

The Sigma was part of the Mitsubishi Diamante platform. This generation (GD/GY) followed earlier iterations and saw updates in styling and technology through its production run. It was succeeded by other models in Mitsubishi's lineup.

Production Period:

1991-1996

Manufacturing Locations:

Primarily manufactured in Japan.

🏆 Awards & Recognition

Awards Recognitions:

While specific awards for the Sigma model might be hard to pinpoint, the Diamante platform it was based on received positive reviews for its comfort and refinement in automotive publications of the time. It was often praised for punching above its weight in terms of luxury appointments.