🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Product Name: Subaru Impreza WRX STI Complete Workshop Service Repair Manual 2015 👋 Introduction Market Position Vehicle Segment: Performance compact sedan/hatchback. Target Audience: Enthusiasts, performance drivers, DIY mechanics, professional technicians seeking in-depth repair information. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, Honda Civic Type R (though WRX STI often occupies a more rally-bred, AWD performance niche). Key Features Performance Orientation: The WRX STI variant is distinguished by its turbocharged boxer engine, Symmetrical All-Wheel Drive system, and performance-tuned suspension, making it a homologation special derived from rally racing heritage. Manual Value Proposition: This manual provides comprehensive, factory-level information crucial for maintaining and repairing the complex mechanical and electronic systems of the 2015 WRX STI, enabling owners and technicians to perform services accurately and efficiently. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, cylinder head, crankshaft, connecting rods, pistons, valve train, timing system, lubrication system, cooling system, fuel system, intake system, exhaust system. Engine Electrical: Engine control module (ECM), ignition system, fuel injection system, sensors, actuators, wiring diagrams, diagnostic trouble codes (DTCs). Transmission Manual: Clutch system, transmission assembly, disassembly, gear sets, synchronizers, shift mechanisms, lubrication, maintenance, troubleshooting. Transmission Automatic: Not applicable for WRX STI models which typically feature a manual transmission only. If an automatic variant exists, coverage would include torque converter, planetary gear sets, hydraulic control system, electronic controls, fluid maintenance, and diagnostics. Drivetrain: All-Wheel Drive (AWD) system, center differential, front differential, rear differential, driveshafts, CV joints, wheel bearings. Suspension: Front suspension (MacPherson struts), rear suspension (double wishbone), springs, shock absorbers, control arms, anti-roll bars, bushings, alignment specifications. Steering: Power steering system (hydraulic or electric), steering column, steering rack, tie rod ends, steering angle sensor. Brakes: Front and rear disc brakes, brake calipers, brake pads, brake rotors, brake lines, master cylinder, brake booster, ABS system, EBD system, parking brake. Electrical System: Battery, alternator, starter motor, lighting system (headlights, taillights, interior), fuses, relays, wiring harnesses, power windows, power locks, mirrors, horn, wipers. Body And Frame: Body panels, chassis components, doors, hood, trunk, bumpers, glass, seals, sound deadening, rust prevention, corrosion control. Interior: Seats, dashboard, center console, upholstery, trim panels, airbags, seatbelts, HVAC system controls, audio system, instrument cluster. HVAC System: Air conditioning (AC) system, heater core, blower motor, climate control panel, refrigerant handling, diagnostic procedures. Safety Systems: Airbag system, SRS module, seatbelt pre-tensioners, ABS, traction control, stability control. Procedures Included Routine Maintenance: Oil changes, filter replacements (oil, air, cabin, fuel), spark plug replacement, fluid checks and top-offs, tire rotation, brake inspection. Troubleshooting: Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides, DTC interpretation and resolution. Repair And Rebuild: Step-by-step instructions for major component repairs and rebuilds, including engine, transmission, differentials, suspension, steering, brakes, and more. Component Replacement: Detailed guides for replacing individual components such as starters, alternators, water pumps, fuel pumps, radiators, AC compressors, turbochargers, clutches, and more. Electrical Diagnostics: Testing circuits, component testing, wiring harness inspection, troubleshooting electrical faults, using diagnostic tools. Torque Specifications: Precise torque values for all critical fasteners to ensure proper assembly and prevent component damage. Wiring Diagrams: Comprehensive electrical wiring schematics for all vehicle systems, aiding in diagnostics and repairs. Technical Depth Depth Of Coverage: Complete, covering everything from basic fluid checks and filter replacements to full engine and transmission rebuilds. Includes advanced diagnostic procedures and detailed component specifications. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text for quick information retrieval. Printability: Printable pages for easy reference during service. Page Count Estimate: ~2000+ pages (typical for comprehensive workshop manuals of this era and vehicle complexity). Quality: High-resolution scans or original manufacturer digital files. Binding Type: N/A (Downloadable format) Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L Boxer-4 Turbocharged DOHC 16-valve Bore X Stroke: 99.5 mm x 79.0 mm Displacement: 2457 cc (2.5 Liters) Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Multi-point fuel injection (MPI) with Subaru's electronic throttle control. Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Turbocharger: IHI VF48 Twin-Scroll Turbocharger Intercooler: Air-to-air top-mount intercooler. Compression Ratio: 8.2:1 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Transmission Code: TY89 Optional Transmission Type: Not Applicable for 2015 WRX STI (Manual only) Features Drivetrain System: Subaru Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD). Dccd Modes: Automatic, Manual (six settings), and Lock modes for optimal torque distribution in various conditions. Clutch Type: Hydraulically actuated, multi-plate clutch. 📐 Dimensions Exterior Length: 4,465 mm (175.8 in) Width: 1,795 mm (70.7 in) Height: 1,475 mm (58.1 in) Wheelbase: 2,650 mm (104.3 in) Ground Clearance: 135 mm (5.3 in) Weights Curb...