Segment:
Performance Compact Sedan/Wagon
Target Audience:
Enthusiasts, Performance Drivers, DIY Mechanics
Key Rivals 2005:
Mitsubishi Lancer Evolution VIII/IX, Subaru WRX (non-STI), Mitsubishi Eclipse GT, Volkswagen GTI, Ford Focus SVT
Vehicle Identity:
Symmetrical All-Wheel Drive, Turbocharged Boxer Engine, Rally-Inspired Performance
Powertrain:
Engine, Drivetrain, Transmission (Manual & Automatic), Clutch, Differentials, AWD System
Chassis:
Suspension (Front & Rear), Steering, Brakes (ABS, EBD), Wheels, Tires
Electrical:
ECU, Wiring Diagrams, Lighting, Ignition, Charging System, Audio System, HVAC Controls, SRS Airbag System, Immobilizer
Body:
Body Panels, Doors, Windows, Seats, Interior Trim, Exterior Trim, HVAC Ducting, Body Sealing
Maintenance:
Scheduled Maintenance, Oil Changes, Filter Replacements, Spark Plug Replacement, Fluid Checks & Replacements, Belt Inspections & Replacements
Repair:
Engine Overhaul, Turbocharger Rebuild, Transmission Rebuild, Brake Caliper Replacement, Suspension Component Replacement, Electrical Component Diagnosis & Repair
Diagnostics:
Troubleshooting Guides, DTC Code Explanations, Circuit Diagnosis, Component Testing Procedures
Engine Diagnostics:
Detailed steps for diagnosing fuel system issues, ignition system problems, emissions control faults, turbocharger performance, and engine mechanical failures.
Transmission Repair:
Complete overhaul procedures for both 5-speed and 6-speed manual transmissions, including synchro ring replacement, bearing checks, and gear inspection.
Braking System Overhaul:
Detailed instructions for brake pad replacement, rotor resurfacing/replacement, caliper servicing, ABS module diagnosis, and brake fluid bleeding procedures.
Depth:
Comprehensive Engine Rebuilds, Detailed Electrical Schematics, Component-Level Diagnostics, Torque Specifications for all Fasteners, Special Tool Requirements
Torque Specifications:
Exhaustive torque values for all critical fasteners, from cylinder head bolts to wheel nuts, ensuring proper assembly and preventing component failure.
Wiring Diagrams:
Full color, detailed wiring schematics for all electrical systems, including engine control, lighting, power windows, SRS, and entertainment systems.
PDF Quality:
High-Resolution Scans, Searchable Text (OCR)
Print Format:
Professionally Bound, Easy-to-Read Layout
Binding:
Coil-bound or Perfect Bound (typical for large manuals)
Paper Quality:
Durable, High-Quality Paper (resistant to shop grease)
Transmission Type Sti:
6-Speed Manual
Transmission Type Wrx:
5-Speed Manual
Optional Transmission:
None (Manual transmission was standard for WRX/STI models in this generation)
AWD System:
Subaru Symmetrical All-Wheel Drive with Driver-Controlled Center Differential (DCCD) on STI
Manual Transmission Fluid:
Subaru Extra S / API GL-4 / GL-5 Gear Oil (e.g., Subaru 003113410 for STI 6MT, 003113150 for WRX 5MT)
Rear Differential Fluid:
API GL-5 Gear Oil (75W-90 Recommended)
NHTSA Front Impact:
5-Star Driver, 4-Star Passenger
Braking System:
4-Wheel Disc Brakes, ABS, EBD (Electronic Brake-force Distribution)
Traction Control:
Standard on WRX, optional on STI (early models), advanced AWD system
Airbags:
Front Dual-Stage Airbags, Side Curtain Airbags (optional)
Seatbelts:
3-Point Pretensioner Seatbelts with Force Limiters
Oil Change Interval:
Every 3,750 miles (6,000 km) or 6 months (severe driving) / 7,500 miles (12,000 km) or 12 months (normal driving)
Timing Belt Replacement:
Every 105,000 miles (168,000 km) or 7 years (whichever comes first) - Critical for EJ engines
Spark Plug Replacement:
Approx. 30,000 miles (48,000 km) for iridium plugs
Engine Oil Spec:
API SG, SH, SJ, SL, SM or ILSAC GF-2, GF-3, GF-4; Viscosity: 5W-30 recommended
Coolant Type:
Subaru Super Coolant / Long Life Coolant (Blue)
Head Gaskets:
While less common on the 2.5L engines of this era compared to earlier EJ22/EJ25, it's still a point of vigilance. Look for coolant leaks or white smoke.
Ring Land Failure:
Can occur on EJ257 engines with aggressive tuning or detonation. Proper fuel and monitoring are key.
Clutch Wear:
Performance driving can lead to accelerated clutch wear.
Turbocharger Issues:
Proper maintenance (oil changes) is crucial to turbo longevity. Signs include smoke or loss of boost.
