Segment:
Full-size/Large Sedan, often positioned as a near-luxury or flagship sedan for Mitsubishi in many markets.
Competitors:
Dominated by Japanese rivals like Toyota Avalon, Nissan Maxima, and American offerings such as Buick LeSabre/Park Avenue, Ford Taurus/Mercury Sable, and some entry-luxury German sedans.
Distinguishing Features:
Comfortable ride, spacious interior, powerful V6 engines, distinct styling (especially the second generation), optional all-wheel drive (AWD).
Legacy:
The Diamante represented Mitsubishi's effort to compete in the premium sedan segment, building on the brand's reputation for reliable and well-engineered vehicles.
Powertrain:
Engine mechanical, fuel system, ignition system, exhaust system, lubrication system, cooling system, engine control systems (ECU), transmission (automatic transmission specific to Diamante).
Chassis:
Suspension (front and rear), steering system, braking system (ABS included), wheels and tires.
Electrical:
Battery, charging system, starting system, lighting systems, instrumentation, audio systems, power accessories (windows, locks, seats), wiring diagrams, multiplex communication systems (if applicable).
Body:
Body panels, doors, windows, exterior trim, interior trim, HVAC (heating, ventilation, and air conditioning) system, seats, airbags.
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, inspections, lubrication.
Diagnostics:
Troubleshooting charts, diagnostic trouble codes (DTCs), symptom-based diagnostics, electrical system diagnostics.
Repair:
Component removal and installation, system overhauls, adjustments, calibration procedures, body repair techniques.
Specifications:
Torque specifications, clearances, fluid capacities, electrical resistance values, test procedures.
Recalibration Procedures:
Covers procedures for recalibrating sensors and systems after component replacement, such as idle air control (IAC) valve or transmission control modules.
Depth:
Detailed, from basic maintenance to complete engine and transmission overhauls, including electrical schematics and diagnostic procedures.
Wiring Diagrams:
Includes detailed electrical circuit diagrams for all major systems, crucial for troubleshooting electrical faults.
Engine Code And Type:
6G7x series V6 (likely 6G75 for later models, 6G72 for earlier variants, depending on market and specific year/trim). Typically a 3.5L V6 (6G74) or 3.8L V6 (6G75) for the later years in this manual's scope.
Displacement:
3.5 Liters (3497cc) or 3.8 Liters (3798cc) depending on specific model year and market.
Horsepower Range:
Approximately 200-240 hp (depending on engine and emissions regulations).
Torque Range:
Approximately 220-250 lb-ft (depending on engine and market).
Induction:
Multi-port Fuel Injection (MPI).
Fuel Type:
Unleaded gasoline.
ECM Type:
Proprietary Mitsubishi ECU (likely referring to engine control modules for the specific engine variants).
Diagnostic Ports:
OBD-II compliant diagnostic port for accessing engine control module data and diagnostic trouble codes.
Transmission Type:
4-speed or 5-speed Automatic Transmission (e.g., F4A51 or V5A51/W5A51 families).
Drive Type:
Available in Front-Wheel Drive (FWD) and often All-Wheel Drive (AWD) with Mitsubishi's INVECS-II system.
Transmission Features:
Sportronic manual shifting mode (on some variants), adaptive shift control (INVECS-II).
Transmission Fluid Type:
Diamond ATF SP-II M or equivalent (check specific manual for exact specification and part number, e.g., Mitsubishi Genuine ATF SP-III).
Length:
Approx. 190-193 inches (Varies slightly by year and body style).
Width:
Approx. 70-71 inches.
Height:
Approx. 56-57 inches.
Passenger Volume:
Approx. 100-105 cubic feet.
Curb Weight:
Approx. 3400-3700 lbs (depending on FWD/AWD and trim).
Gross Vehicle Weight Rating:
Typically around 4500-4800 lbs.
NHTSA Front Crash Test Rating:
Generally good to excellent for its era (4 or 5 stars for driver/passenger frontal impact, specifics vary by year).
IIHS Crash Test Rating:
Typically rated 'Good' in frontal offset crash tests for earlier generations, later years should be checked for specific ratings.
ABS:
Standard Anti-lock Braking System (ABS).
Traction Control:
Available Traction Control System (TCS) on some models, often linked with AWD.
Airbags:
Frontal airbags for driver and passenger, side-impact airbags (optional on some trims).
Seatbelts:
Three-point seat belts with pretensioners and load limiters for front occupants.
Audio System:
Premium audio systems available, often with CD player, radio, and cassette tape (early models).
Navigation:
Optional factory navigation system on higher trims, typically CRT-based for this era.
Cruise Control:
Standard electronic cruise control.
Remote Keyless Entry:
Available remote keyless entry system.
HVAC Features:
Automatic climate control (optional/standard on higher trims) with recirculation mode and cabin air filter.
Oil Change Interval:
Typically every 3,750 to 7,500 miles or 6 months, whichever comes first, depending on driving conditions and oil type (refer to manual for precise recommendation).
Spark Plug Replacement:
Platinum tipped plugs usually good for 60,000-100,000 miles (refer to manual for specific type and interval).
Timing Belt Replacement:
Crucial for 6G7x engines; typically every 60,000-90,000 miles or 5-7 years. Failure can cause catastrophic engine damage.
Engine Oil Type:
API Service SG, SH, or SJ quality, SAE 5W-30 or 10W-30 viscosity (refer to manual for exact recommendation based on climate).
Engine Oil Capacity:
Approx. 4.5-5.0 quarts (with filter) for 3.5L/3.8L V6.
Coolant Type:
Ethylene glycol-based coolant, typically a 50/50 mix with deionized water (refer to manual for specific Mitsubishi Long Life Coolant type).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Power Steering Fluid:
Mitsubishi DIAPHENE PSF or Dexron III/Mercon equivalent (confirm with manual).
Differential Fluid:
API GL-5, SAE 75W-90 for AWD models (check manual for exact specification).
Common Wear Items:
Front struts/shocks, sway bar links, transmission solenoids (can cause shifting issues), catalytic converters (pre-2003 models can be prone to failure), oxygen sensors.
Engine Related:
Head gasket leaks (less common on later V6s but possible), timing belt tensioner/pulley failure.
Electrical Issues:
Window regulator failures, interior lighting issues, intermittent warning lights.
Mitsubishi Legacy:
Mitsubishi has a long history of producing reliable and technologically advanced vehicles, often with a focus on rally heritage and robust engineering.
Diamante Generations:
The manual covers the second generation (1996-2005 in North America), known for its distinctive styling and luxurious features for its price point.
Manufacturing Location:
Primarily produced in Japan (e.g., Mizuno Plant, Okazaki).
Historical Accolades:
While not a segment leader, the Diamante received generally positive reviews for its comfortable ride, spaciousness, and value proposition during its production run.
Consumer Reports Reliability:
Reliability ratings varied by year and specific component; the manual would detail common diagnostic and repair procedures to address potential issues.
