Market Position:
The Mitsubishi Diamante was positioned as a premium, near-luxury sedan, competing in a segment against established players like the Toyota Camry/Lexus ES, Honda Accord/Acura Legend, and Nissan Maxima.
Competitive Analysis:
It offered a distinctive design, a powerful V6 engine, and a focus on ride comfort and sophisticated features for its time, aiming to provide a compelling alternative to more mainstream sedans.
Key Features:
Available V6 engines, optional all-wheel drive, sophisticated interior appointments, emphasis on smooth ride quality, and a distinct styling that set it apart from other Mitsubishi models.
Manual Usefulness:
This workshop manual is an indispensable resource for owners and mechanics seeking to maintain, diagnose, and repair the Mitsubishi Diamante. Its comprehensive nature ensures that even complex procedures can be tackled with confidence.
Engine Mechanical:
Engine assembly, cylinder head, pistons, crankshaft, camshafts, timing system, lubrication system, cooling system, fuel injection, emissions control.
Engine Management:
ECU, sensors (MAP, MAF, TPS, O2, ECT), actuators (injectors, ignition coils), diagnostic trouble codes (DTCs), self-diagnosis procedures.
Transmission:
Automatic Transaxle (W4A51, V4A51), manual transmission (if applicable for specific markets), gear shifting mechanisms, torque converter, transmission control unit (TCU).
Drivetrain:
Front-wheel drive (FWD), All-wheel drive (AWD) systems (if equipped), driveshafts, CV joints, differential, hub assemblies.
Suspension And Steering:
Front suspension (MacPherson strut, multi-link), rear suspension (multi-link), shock absorbers, springs, control arms, sway bars, power steering system, steering rack, steering column.
Brakes:
Front and rear disc brakes, Anti-lock Braking System (ABS), brake hydraulic system, master cylinder, calipers, pads, rotors, brake lines, parking brake.
Electrical System:
Battery, charging system (alternator, regulator), starting system (starter motor), ignition system, lighting system, horns, power windows, power mirrors, central locking, dashboard instruments, gauges, warning lights.
Body And Chassis:
Body construction, frame, doors, hood, trunk, bumpers, glass, interior trim, seating, sound insulation.
HVAC System:
Air conditioning (compressor, condenser, evaporator, refrigerant), heating system, ventilation, controls, blower motor.
Safety Systems:
Airbag system (SRS), seat belts, passive restraint systems.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection and replacement, tire rotation, brake pad replacement.
Troubleshooting:
Diagnostic procedures for engine performance, transmission issues, electrical faults, brake problems, HVAC malfunctions, guided by symptoms and error codes.
Repair:
Detailed step-by-step repair instructions for all major components and systems, including engine disassembly/reassembly, transmission overhaul, brake caliper replacement, suspension component repair, electrical component diagnosis and replacement.
Diagnostics:
Comprehensive diagnostic charts, wiring diagrams, and procedures for identifying and resolving various vehicle issues.
Specifications:
Torque specifications for fasteners, fluid capacities, electrical system specifications, engine timing specifications, component clearances, diagnostic specifications.
Technical Depth:
Full factory level, covering everything from basic maintenance to complete engine and transmission rebuilds, including detailed electrical system diagnostics and bodywork repairs.
Engine Code V6 3.0L Sohc:
6G72
Engine Type V6 3.0L Sohc:
60-degree V6, SOHC (Single Overhead Camshaft)
Displacement V6 3.0L Sohc:
2,972 cc (181.4 cu in)
Bore X Stroke V6 3.0L Sohc:
86.1 mm x 84.2 mm (3.39 in x 3.31 in)
Compression Ratio V6 3.0L Sohc:
8.5:1 (typical)
Fuel System V6 3.0L Sohc:
Multi-point Fuel Injection (MPI)
Horsepower V6 3.0L Sohc:
Approx. 170-188 hp @ 5,500-6,000 rpm (depending on year and specific tuning)
Torque V6 3.0L Sohc:
Approx. 177-190 lb-ft @ 3,000-4,500 rpm (depending on year and specific tuning)
Engine Code V6 3.0L DOHc:
6G72 (DOHC variant)
Engine Type V6 3.0L DOHc:
60-degree V6, DOHC (Double Overhead Camshaft), 24 valves
Horsepower V6 3.0L DOHc:
Approx. 200-215 hp @ 6,000 rpm
Torque V6 3.0L DOHc:
Approx. 205-215 lb-ft @ 4,500 rpm
Oil Change Interval:
Typically every 3,000-5,000 miles (5,000-8,000 km) or 3-6 months, depending on driving conditions and oil used. Consult the manual for specific recommendations.
Timing Belt Replacement:
Crucial for 6G72 engines. Generally recommended every 60,000 - 90,000 miles (96,000 - 144,000 km). Failure can cause catastrophic engine damage.
Engine Oil Type:
API SG/SH rated, viscosity typically 5W-30 or 10W-30, depending on climate. Refer to manual for exact specs.
Coolant Type:
Ethylene glycol based coolant (green), typically a 50/50 mixture with distilled water. Consult manual for specific Mopar or equivalent specifications.
Automatic Transmission Fluid:
Mitsubishi Diamond SP-II or SP-III (or equivalent DEXRON-III/MERCON compatible fluid). Refer to manual for precise specification.
Power Steering Fluid:
Typically ATF Dexron II/III or a specific Mitsubishi power steering fluid.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Known Issues:
Timing belt failure (critical maintenance item), potential for head gasket leaks on higher mileage engines, automatic transmission internal wear, ABS sensor faults, power window motor issues, HVAC system blower motor failures.
