The Mitsubishi Sigma, a large sedan produced from 1990 to 1995, offers a blend of V6 engine power, refined styling, and a comfortable ride, positioning it as a competitive option in its segment. Built on Mitsubishi's global platform, this model was also known as the Diamante in North America, reflecting its international appeal. Available with 2.5L and 3.0L V6 engines, and either a 4-speed automatic or 5-speed manual transmission, the Sigma provided a range of powertrain options, with some models featuring All-Wheel Drive. Its engineering quality and focus on driver comfort made it a notable entry against contemporaries like the Toyota Camry and Honda Accord.
This comprehensive workshop repair and service manual provides in-depth guidance for maintaining and repairing the Mitsubishi Sigma across all its models, engines, trims, and transmission types. Covering critical areas such as engine management, drivetrain, chassis, and electrical systems, the manual includes detailed procedures for maintenance, diagnostics, and repair, along with essential technical specifications and torque values. With hundreds of pages, clear illustrations, and step-by-step instructions, this resource is invaluable for owners, mechanics, and technicians aiming to ensure the longevity and optimal performance of their Sigma.
Model Years Covered:
1990, 1991, 1992, 1993, 1994, 1995
Chassis Code:
GD/GK Series (Global Platform)
Engine Codes Common:
6G71 (3.0L V6), 6G72 (3.0L V6 MIVEC on later models), 6G73 (2.5L V6 DOHC)
Transmission Codes Common:
F4A51 (4-speed Automatic), W5MG1 (5-speed Manual), KM150 (5-speed Manual)
Segment:
Large Sedan/Luxury Sedan
Target Audience:
Owners seeking to perform self-maintenance and repairs, DIY enthusiasts, independent repair shops
Competitors Era:
Toyota Camry/Avalon, Honda Accord, Nissan Maxima, Ford Taurus, Chevrolet Lumina
Value Proposition:
Enables significant cost savings on maintenance and repairs by empowering owners with professional-grade information
Ease Of Use:
Numbered instructions, clear diagrams, and comprehensive troubleshooting facilitate efficient repairs
Primary Coverage:
All models, engines, trims, and transmission types
Geographical Coverage:
Likely covers global specifications as Sigma was sold under various names (e.g., Diamante in North America)
Estimated Page Count:
Hundreds of pages (as stated in product description)
Type:
Workshop Repair and Service Manual
Authenticity:
Original manufacturer's manual equivalent
File Format:
PDF Download
Delivery Method:
Instant Download
Engine Management:
Engine service, repair, fuel injection, fuel system, emission system, engine control system
Drivetrain:
Transmission service/repair, differential, drive axle
Chassis:
Brake system, suspension, steering, chassis, body
Electrical:
Electrical system, wiring diagrams, engine control system
Comfort And Convenience:
Heater, Air Conditioning, Interior, Restraint System
Maintenance:
General maintenance, periodic lubrication, fluid checks and changes
Diagnostics:
Troubleshooting, diagnostic procedures for electrical systems
Repair And Rebuild:
Detailed substeps for repair procedures, disassembly, assembly, cleaning, and reinstallation
Technical Data:
Critical specifications, torque values, clearances
Depth:
Comprehensive; designed for professional technicians, covering detailed diagnostics and repairs
Visuals:
Detailed illustrations, drawings, photos, enlarged insets for specific parts
Requirements:
Adobe PDF Reader, WinZip
Compatibility:
All Versions of Windows & Mac
Printability:
Full Printable
Zoom Functionality:
YES (Zoom IN/OUT)
Binding:
N/A (Digital Download)
Paper Type:
N/A (Digital Download)
Engine Type Common:
V6 SOHC/DOHC
Displacement Common:
2.5L, 3.0L
Horsepower Range:
Approx. 170-220 hp (depending on specific engine and year)
Torque Range:
Approx. 200-260 lb-ft (depending on specific engine and year)
Injection Type:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded Gasoline
ECU Coverage:
Includes detailed information on Engine Control Unit (ECU) and associated sensors and actuators
Transmission Type Standard:
4-speed Automatic
Transmission Type Optional:
5-speed Manual
AWD Availability:
Available on some models/trims (often designated 'V6 AWD' or similar)
Automatic Transmission Fluid Type:
Diamond SP-III or equivalent (check specific manual for exact spec)
Manual Transmission Fluid Type:
GL-4 or GL-5 Gear Oil (viscosity typically 75W-90)
Curb Weight Range:
Approx. 3300 - 3700 lbs (depending on engine and trim)
Airbag Availability:
Driver's side airbag standard on later models, passenger airbag optional/standard on some trims
ABS Availability:
Anti-lock Braking System (ABS) often standard or optional on higher trims
Seat Belts:
Front and rear seat belts
Restraint System Coverage:
Includes detailed information on the restraint system, potentially including pre-tensioners on later models
Audio System:
Factory premium audio systems with cassette player and optional CD player
Cruise Control:
Standard on most models
Remote Keyless Entry:
Optional on certain trims
Oil Change Interval:
Typically every 3,750-5,000 miles or 6 months, whichever comes first (refer to manual for exact spec)
Timing Belt Replacement:
Crucial for 6G7x engines; generally recommended every 60,000-90,000 miles (check manual for specific engine)
Spark Plug Replacement:
Recommended around 30,000-60,000 miles, depending on plug type (refer to manual)
Engine Oil Type:
API SG or higher; SAE 10W-30 or 10W-40 typically recommended (check manual)
Coolant Type:
Ethylene Glycol based, typically a 50/50 mix with distilled water. Consult manual for specific Mitsubishi coolant specification.
Brake Fluid Type:
DOT 3 or DOT 4
Common Wear Items:
CV axles, engine mounts, suspension bushings, oxygen sensors, catalytic converter
Engine Specific Concerns:
Potential for oil leaks, timing belt failure if not replaced proactively, occasional head gasket issues on high-mileage V6s
Manufacturer History:
Mitsubishi Motors Corporation, known for its engineering and diverse product range.
Platform:
Based on Mitsubishi's global platform, shared with models like the Diamante.
Market Variants:
Sold as Mitsubishi Sigma in many markets, but also as Mitsubishi Diamante in North America and other regions.
Production Years:
1990-1996 (Generation 1)
Initial Reception:
Generally well-received for its styling, ride comfort, and V6 power, competing effectively in the mid-size luxury sedan segment.
