🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Generation: G3 Codes Model Code: VAB (specific chassis codes may vary within G3 STI) 👋 Introduction Market Position Vehicle Segment: Compact Sports Sedan/Hatchback (Performance variant of Subaru Impreza) Target Audience: Enthusiasts, performance drivers, rally racing fans, DIY mechanics. Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI/R, Ford Focus RS, Honda Civic Type R. Key Features Performance Heritage: Iconic turbocharged boxer engine, Symmetrical All-Wheel Drive, rally-bred DNA, strong aftermarket support. Manual Value Proposition: Enables owners to perform complex maintenance, diagnostics, and repairs, saving on dealership labor costs and empowering customization. 📋 Manual Details Coverage Areas Geographical Coverage: Global (primarily North America and Europe, but applicable to worldwide models with minor regional variations) Page Count Estimated Page Count: 1500-2000+ pages (typical for a complete workshop manual of this scope) Manual Type Manual Type: Complete Workshop Service and Repair Manual Language Language: English Format Format: Downloadable (typically PDF) 📖 Manual Coverage Systems Covered Engine System: EJ257 2.5L Turbocharged Boxer Engine: Mechanical, lubrication, cooling, fuel injection, ignition, emissions control, turbocharger, ECU diagnostics. Transmission System: 6-Speed Manual Transmission (TY856WB1CA): Removal, installation, disassembly, assembly, internal components, lubrication, clutch system. Drivetrain System: All-Wheel Drive (AWD) System: DCCD (Driver Controlled Center Differential), front/rear differentials, driveshafts, CV joints, hub bearings. Brake System: Performance Braking System (Brembo): Front/rear caliper servicing, rotor replacement, brake fluid bleeding, ABS integration, parking brake. Suspension Steering System: Performance Suspension: Front struts (inverted), rear shock absorbers, springs, control arms, sway bars, steering rack, power steering system, alignment specifications. Electrical System: Wiring diagrams, starter, alternator, battery, lighting (headlights, taillights, fog lights), fuses, relays, body control module (BCM), ECU pinouts, sensor identification. Body And Interior: Exterior body panels, doors, hood, trunk, bumpers, interior trim, seats, airbags, climate control system, sound insulation. HVAC System: Air conditioning (compressor, condenser, evaporator), heating system, blower motor, controls, refrigerant. Fuel System: Fuel tank, fuel pump, fuel injectors, fuel pressure regulator, fuel lines, EVAP system. Procedures Included Maintenance Procedures: Oil and filter changes, air filter replacement, spark plug replacement, coolant flush and fill, brake fluid flush, differential fluid changes, transmission fluid changes. Repair Procedures: Engine component replacement (pistons, rods, bearings, valves), turbocharger rebuild, clutch replacement, transmission overhaul, differential rebuild, suspension component replacement, brake caliper rebuild. Diagnostic Procedures: OBD-II diagnostics, trouble code interpretation, sensor testing, circuit testing, pressure testing (fuel, oil, compression), leak detection. Troubleshooting Guides: Step-by-step troubleshooting for common and uncommon vehicle problems, symptom-based diagnostics. Technical Specifications: Torque specifications for all fasteners, critical measurements, clearances, alignment settings, engine data, transmission gear ratios. Technical Depth Diagnostic Capability: Advanced diagnostics including ECU parameter monitoring, actuator testing, and detailed electrical system troubleshooting. Rebuild Capability: Comprehensive procedures for complete engine and transmission rebuilds, including detailed disassembly and reassembly instructions. Bodywork Coverage: Detailed information on body panel alignment, repair techniques, and paint code references. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval Print Quality Image Resolution: High-resolution images, diagrams, and schematics for clarity Printable: Printable pages for on-the-go reference Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: Horizontally-opposed (Boxer), 4-cylinder, turbocharged, intercooled Displacement: 2.5 Liters (2457 cc) Bore X Stroke: 99.5 mm x 80.0 mm Performance Horsepower: 305 hp @ 6000 rpm (SAE Net) Torque: 290 lb-ft @ 4000 rpm (SAE Net) Fuel System Fuel Induction: Sequential multi-port fuel injection (S-MPFI) with Denso or Bosch injectors Fuel Requirement: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management ECU Type: Denso or Hitachi ECU (specific model varies) Ignition System: Electronic ignition with coil-on-plug design 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission Model: TY856WB1CA Optional Optional Transmission: None for WRX STI trim in this generation Features Dccd: Driver Controlled Center Differential (Manual control of center differential locking) Gear Ratios: 1st: 3.636, 2nd: 2.235, 3rd: 1.524, 4th: 1.120, 5th: 0.971, 6th: 0.775, Reverse: 3.545 (Typical, verify with specific model year) Fluid Specifications Transmission Fluid Type: Subaru Extra-S Gear Oil (or equivalent API GL-5, SAE 75W-90 synthetic) - front and rear differentials 📐 Dimensions Exterior Length: 4,415 mm (Hatchback) / 4,580 mm (Sedan) Width: 1,795 mm Height: 1,475 mm (Hatchback) / 1,450 mm (Sedan) Wheelbase: 2,650 mm Weights Curb Weight: Approx. 1,505 kg (Hatchback) / 1,520 kg (Sedan) Gross Vehicle Weight Rating Gvwr: Approx. 1,950 kg Wheels Tires Wheel Size: 18-inch alloy wheels Tire Size: 245/40R18 Bolt Pattern: 5 x 114.3 mm (5 x 4.5 inches) 🛡️ Safety Features Ratings NHTSA Safety Rating: Generally good ratings for its era, though specific results for the STI variant might differ slightly from standard Impreza models. Expect 4-5 star ratings in key categories. Active Features Traction Control: SI-DRIVE (Subaru Intelligent Drive) with Sport Sharp mode, Traction Control System (TCS), Vehicle Dynamics Control (VDC). AWD System: Symmetrical...