Market Segment:
Performance Compact Sedan/Wagon
Target Audience:
Enthusiasts, DIY Mechanics, Service Technicians
Competitors:
Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI
Performance Focus:
Iconic turbocharged Boxer engine, rally-bred AWD system, driver-focused cockpit.
Manual Value Proposition:
Empowers owners and technicians with in-depth knowledge for optimal performance and longevity.
Primary Coverage:
Complete Service and Repair
Secondary Coverage:
Maintenance, Diagnostics, Troubleshooting, Reassembly
Type:
Factory Service Manual (FSM)
Format:
Digital Download (PDF)
Powertrain:
Engine (EJ207), Transmission (6-speed manual), Drivetrain (Symmetrical AWD)
Chassis:
Suspension, Steering, Brakes, Wheels, Tires
Body:
Exterior Body Panels, Interior Trim, Glass, Doors, Locks
Electrical:
Wiring Diagrams, Lighting, Instrumentation, ECUs, Audio System
HVAC:
Heating, Ventilation, Air Conditioning System
Emissions:
Evaporative Emission Control (EVAP), Exhaust System
Maintenance:
Oil Changes, Filter Replacements, Spark Plug Replacement, Belt Inspections
Engine Repair:
Engine Overhaul, Piston and Ring Replacement, Cylinder Head Reconditioning, Turbocharger Service
Transmission Repair:
Clutch Replacement, Gearbox Disassembly and Reassembly, Differential Service
Suspension And Steering Repair:
Strut and Shock Absorber Replacement, Ball Joint and Bushing Service, Power Steering System Diagnosis
Brake System Repair:
Brake Pad and Rotor Replacement, Caliper Service, Bleeding Procedures
Electrical Diagnostics:
Troubleshooting Shorts, Open Circuits, ECU Fault Codes
Troubleshooting:
Diagnostic Flowcharts, Symptom-Based Diagnosis
Depth:
Comprehensive: From basic fluid checks to full engine and transmission rebuilds.
Diagnostic Codes:
Includes OBD-II diagnostic trouble codes (DTCs) specific to the EJ207 engine and Subaru ECUs.
Torque Specifications:
Detailed torque specifications for all critical fasteners.
Special Tools:
Lists required Subaru special tools and their part numbers for specific procedures.
Engine Type:
2.0L DOHC 16-Valve Turbocharged Boxer (EJ207)
Horsepower Est:
265 hp @ 6000 rpm (JDM/European Spec)
Torque Est:
253 lb-ft @ 4000 rpm (JDM/European Spec)
Injection Type:
Multi-point Fuel Injection (MPI)
Fuel Requirement:
Premium Unleaded Gasoline (91+ Octane Recommended)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent
Oil Type:
SAE 5W-30 or 10W-30 Synthetic Engine Oil
Oil Capacity:
4.5 US Quarts (4.3 Liters) with filter
Transmission Type:
6-Speed Manual Transmission (TY856WB1AA / TY856WB2AA)
Transmission Options:
None available for WRX STI model.
Drivetrain:
Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD)
Manual Transmission Fluid:
Subaru Extra-S Gear Oil GL-5 75W-90
NHTSA Front Impact:
Not explicitly rated for 2004 model year, but designed to meet safety standards.
IIHS Side Impact:
Not explicitly rated for 2004 model year, but designed to meet safety standards.
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Standard Traction Control System (TCS)
AWD:
Standard Symmetrical All-Wheel Drive
Airbags:
Front Dual Stage Airbags, Front Side-Impact Airbags
Seatbelts:
3-Point Height-Adjustable Front Seatbelts with Pretensioners, 3-Point Rear Seatbelts
Rollover Protection:
Reinforced Body Structure
Audio System:
Standard AM/FM/CD Player with 4-6 speakers, optional premium audio.
Display:
Basic digital clock and radio display.
Cruise Control:
Standard Cruise Control
Limited Slip Differentials:
Front Helical LSD, Rear Viscous LSD (standard), DCCD for center differential adjustment.
Auxiliary Input:
Not standard; aftermarket solutions often available.
Oil Change Interval:
Every 3,750 - 7,500 miles or 6 months, depending on driving conditions (severe vs. normal).
Air Filter Replacement:
Every 15,000 - 30,000 miles or as needed based on conditions.
Spark Plug Replacement:
Every 30,000 - 60,000 miles (depending on plug type, iridium recommended).
Timing Belt Replacement:
Every 105,000 miles or 7 years (crucial for EJ207 engine).
Brake Fluid:
DOT 3 or DOT 4 Brake Fluid
Power Steering Fluid:
Subaru Genuine Power Steering Fluid or equivalent Dexron III/Mercon ATF
Coolant Capacity:
Approximately 6.5 US Quarts (6.2 Liters)
Ring Land Failure:
Potential for piston ring land failure under high detonation or prolonged abuse (common concern for modified EJ207s).
Clutch Wear:
High-performance nature can lead to faster clutch wear with aggressive driving.
Head Gasket Leaks:
While less common on EJ207 than some other Subaru engines, still a potential area to monitor.
Turbocharger Maintenance:
Proper oil changes and allowing turbo to cool down are critical to longevity.
Brand Focus:
Subaru's reputation for durable Boxer engines and advanced AWD systems, often associated with motorsport.
Gd Generation:
Represents the second generation (GD) of the Impreza, known for its distinctive 'bug-eye' or 'hawk-eye' styling cues depending on the specific facelift.
Sti Development:
STI (Subaru Tecnica International) version represents the pinnacle of performance tuning from Subaru, honed through rallying success.
Production Period:
2000-2007 (GD Generation)
Key Markets:
Japan, North America, Europe, Australia (specific configurations vary by market).
