🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Model Years Covered:

2001, 2002

Chassis Codes:

GDA (WRX Sedan), GDB (WRX STI Sedan/Wagon), GG (Wagon/Hatchback), GD (Sedan)

Engine Codes:

EJ205 (2.0L Turbo), EJ251 (2.5L NA), EJ253 (2.5L NA), EJ207 (2.0L Twin-Scroll Turbo - JDM/EDM WRX STI)

👋 Introduction

Positioning:

The Subaru Impreza of this era, particularly the WRX and STI variants, occupied a unique niche as a rally-inspired performance sedan/wagon, offering potent turbocharged performance and Subaru's signature Symmetrical All-Wheel Drive in a practical package. This manual serves enthusiasts and professional technicians working on these iconic vehicles.

Competitors:

Key competitors included models like the Mitsubishi Lancer Evolution, Ford Focus RS (in Europe), and other performance compacts. The Impreza stood out with its boxer engine, AWD system, and rally heritage.

Vehicle Highlights:

Standard Symmetrical All-Wheel Drive, turbocharged boxer engines (EJ205, EJ207), advanced driver-controlled center differential (DCCD) on STI models, robust chassis, and a strong enthusiast following.

📋 Manual Details

Primary Coverage:

North American Market (USA, Canada)

Secondary Coverage:

General International specifications relevant to EJ series engines and chassis

Estimated Pages:

1500+

Type:

Service Repair Workshop Manual

Language:

English

Format:

Digital (likely PDF, often sold as downloadable or on CD/USB)

📖 Manual Coverage

Powertrain:

Engine mechanical (EJ205, EJ251, EJ253, EJ207), Engine control systems (ECU, sensors, actuators), Fuel injection, Ignition system, Cooling system, Lubrication system, Exhaust system, Turbocharger systems (for WRX models)

Drivetrain:

Manual Transmission (5-speed, 6-speed for STI), Automatic Transmission (4-speed), Clutch system, All-Wheel Drive (AWD) system (DCCD for STI), Driveshafts, Differentials

Chassis:

Suspension (front MacPherson strut, rear multi-link), Steering system (power assisted), Brakes (front vented discs, rear solid/vented discs, ABS), Wheel hub and bearing assembly

Electrical:

Wiring diagrams, Charging system (alternator, battery), Starting system, Lighting system, Instrument cluster, HVAC controls, Audio system, Power windows, Power locks, Airbag system (SRS)

Body And Interior:

Body panels, Doors, Hood, Trunk, Bumpers, Interior trim, Seats, Glass, Seals, Exterior trim

Maintenance:

Oil change, Filter replacement, Fluid checks and changes (coolant, brake fluid, transmission fluid, differential fluid, power steering fluid), Spark plug replacement, Air filter replacement, Belt replacement

Repair:

Engine overhaul (short block, long block), Cylinder head repair, Turbocharger rebuild/replacement, Transmission overhaul/rebuild, Clutch replacement, Brake caliper overhaul/replacement, Suspension component replacement (struts, control arms, bushings), Power steering pump replacement, Radiator replacement, Fuel pump replacement

Diagnostics:

Troubleshooting guides, Diagnostic trouble codes (DTCs) with explanations and resolution steps, Component testing procedures, Wiring harness continuity checks

Depth:

Comprehensive: Covers everything from routine maintenance and fluid changes to complete engine and transmission overhauls, including detailed diagnostic procedures and wiring schematics. Suitable for professional mechanics and advanced DIY enthusiasts.

📊 Manual Specifications

Format Details:

Digital format, typically PDF. Features searchable text for quick information retrieval. High-resolution diagrams and schematics.

Printability:

Printable, allowing users to print specific sections or the entire manual for hands-on use.

Binding:

N/A (Digital format)

Paper Quality:

N/A (Digital format)

⚙️ Engine Specifications

Base Engine Na:

2.5L Naturally Aspirated EJ251/EJ253 SOHC Boxer-4

Performance Na Approx:

165-175 horsepower @ 5600-6000 RPM, 166-177 lb-ft torque @ 3600-4000 RPM

Performance Wrx Approx:

2.0L Turbocharged EJ205 DOHC Boxer-4: 227 horsepower @ 5600 RPM, 217 lb-ft torque @ 4000 RPM

Performance Sti Approx:

2.0L Twin-Scroll Turbo EJ207 DOHC Boxer-4 (JDM/EDM spec): ~265-280 horsepower, ~255-260 lb-ft torque

Injection Type:

Multi-point fuel injection (MPFI) with electronic control

Fuel Type Na:

Unleaded gasoline, 87 octane (minimum recommended)

Fuel Type Turbo:

Unleaded gasoline, 91 octane (premium, recommended for optimal performance and to prevent knock)

Boost Pressure Wrx:

Approx. 14.7 psi (1.0 bar)

Boost Pressure Sti:

Approx. 16.0 psi (1.1 bar)

🔧 Transmission

Transmission Na Model:

5-speed Manual Transmission

Transmission Wrx Model:

5-speed Manual Transmission

Transmission Sti Model:

6-speed Manual Transmission

Transmission Na Optional:

4-speed Automatic Transmission

AWD System:

Symmetrical All-Wheel Drive with viscous coupling center differential (open center diff on NA models with auto trans). DCCD (Driver Controlled Center Differential) on STI models for manual torque distribution.

Fluid Type Manual:

API GL-5 Gear Oil, SAE 75W-90 (Subaru Genuine or equivalent)

Fluid Type Auto:

Subaru ATF-HP (Genuine or equivalent)

📐 Dimensions

Length Sedan:

Approx. 4,415 mm (173.8 in)

Length Wagon:

Approx. 4,405 mm (173.4 in)

Width:

Approx. 1,750 mm (68.9 in)

Height Sedan:

Approx. 1,430 mm (56.3 in)

Height Wagon:

Approx. 1,445 mm (56.9 in)

Wheelbase:

Approx. 2,510 mm (98.8 in)

Curb Weight Na:

Approx. 1,300 - 1,400 kg (2,866 - 3,086 lbs)

Curb Weight Wrx:

Approx. 1,450 kg (3,197 lbs)

Curb Weight Sti:

Approx. 1,470 kg (3,241 lbs)

Wheel Bolt Pattern:

5x100mm

Tire Size Na Common:

205/50R16, 215/45R17

Tire Size Wrx Common:

205/50R16, 225/45R17

Tire Size Sti Common:

225/45R17

🛡️ Safety Features

NHTSA Front Impact:

4-star driver, 5-star passenger (2001 Sedan)

IIHS Offset Front:

Good (2001 Sedan)

Active Safety Standard:

All-Wheel Drive

Active Safety Optional:

Anti-lock Braking System (ABS)

Passive Safety Standard:

Dual front airbags, crumple zones, reinforced safety cage

Passive Safety Optional:

Side airbags (availability varied by trim and year)

💡 Technology Features

Infotainment System:

Basic factory radio systems, typically AM/FM/CD players. Higher trims may have premium audio. Aftermarket upgrades are common.

Driver Assistance Features:

Primarily ABS and AWD. Advanced driver-assistance systems (ADAS) like adaptive cruise control or lane-keeping assist were not common in this generation.

Connectivity Features:

Limited to basic audio inputs (e.g., cassette or CD). No factory Bluetooth or USB connectivity typically found in later models.

🔧 Maintenance

Oil Change Interval:

Every 3,000-7,500 miles or 3-6 months, depending on driving conditions (refer to owner's manual for specific recommendations; severe service interval is typically shorter).

Transmission Fluid Interval Manual:

Every 30,000-60,000 miles (Subaru Genuine gear oil recommended for longevity).

Transmission Fluid Interval Auto:

Every 30,000 miles (Subaru ATF-HP recommended).

Coolant Replacement Interval:

Initial change at 30,000 miles or 24 months, then every 30,000 miles or 24 months thereafter (Subaru Super Coolant or equivalent).

Spark Plug Replacement Na:

Every 60,000 miles (NGK Iridium recommended)

Spark Plug Replacement Turbo:

Every 30,000 miles (NGK Iridium recommended, colder heat range for turbo models)

Engine Oil Type:

5W-30 or 10W-30 (API SM/SN or equivalent), Synthetic recommended, especially for turbo models. Consult specific model year recommendations.

Engine Oil Capacity Na:

Approx. 4.5 US quarts (4.2 L) with filter

Engine Oil Capacity Turbo:

Approx. 4.8 US quarts (4.5 L) with filter

Brake Fluid Type:

DOT 3 or DOT 4

Power Steering Fluid Type:

Subaru ATF-HP (Genuine or equivalent)

Engine Head Gaskets:

While less prone than some earlier EJ engines, head gasket leaks can still occur, especially with higher mileage or if subjected to excessive heat/stress. The manual details inspection and replacement procedures.

Turbo Oil Lines:

On WRX/STI models, the oil feed lines to the turbo can become clogged or fail, leading to turbo damage. Regular oil changes with quality oil are crucial. The manual covers turbo system diagnostics.

Suspension Bushings:

Worn suspension bushings can lead to sloppy handling and noise. The manual provides guides for bushing inspection and replacement.

Clutch Wear:

Clutch wear is typical for manual transmission vehicles, especially performance variants. The manual details clutch inspection and replacement procedures.

📚 Vehicle History

Heritage Focus:

Subaru's heritage is deeply rooted in aviation engineering, which influences its distinctive boxer engine designs and commitment to all-wheel drive technology. This DNA is evident in the Impreza's performance and handling characteristics.

Generation:

This manual covers the second generation (GD/GG) Subaru Impreza, which debuted for the 2002 model year in North America, succeeding the first generation (GC/GF/GM). The 2001 model year in North America was the final year of the first generation, but this manual likely includes late first-gen variations and the early second-gen transition for certain components.

Design Philosophy:

The second generation adopted a more aggressive, angular design, moving away from the softer lines of the first generation. It was developed with significant input from Subaru's rally program, emphasizing performance and handling.

Assembly Location:

Japan (Main production for most markets)

🏆 Awards & Recognition

Rally Heritage:

The Impreza platform, particularly the WRX and STI variants, is synonymous with World Rally Championship (WRC) success. This racing pedigree translates into the vehicle's performance characteristics and enthusiast appeal.

Performance Reputation:

Consistently praised for its handling, grip, and turbocharged performance, especially in WRX and STI trims, making it a popular choice for enthusiasts and performance driving events.