🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Generation:

2nd Generation (GD/GG)

Chassis Codes:

GD (Sedan), GG (Wagon)

Production Years Covered:

2002, 2003, 2004, 2005, 2006

👋 Introduction

Segment:

Compact/Small Family Car, Rally-inspired Sedan/Hatchback

Usp:

Symmetrical All-Wheel Drive, turbocharged WRX and STI performance variants, practical and durable.

Key Competitors:

Mitsubishi Lancer Evolution, Honda Civic Si, Mazda3, Toyota Corolla.

AWD System:

Standard Symmetrical All-Wheel Drive on most models, providing excellent traction and handling.

Performance Variants:

Iconic WRX and WRX STI models with turbocharged engines and enhanced performance features.

Body Styles:

Available as a 4-door sedan and a 5-door wagon (classified as GG chassis).

📋 Manual Details

Diagnostic Procedures:

Comprehensive diagnostic procedures for all systems.

Repair Procedures:

Detailed step-by-step repair procedures for all components.

Maintenance Schedules:

Scheduled maintenance intervals and recommended services.

Wiring Diagrams:

Complete electrical wiring diagrams.

Troubleshooting Guides:

Extensive troubleshooting guides for common and complex issues.

Technical Specifications:

In-depth technical specifications for all vehicle systems.

Special Tools:

Listing and usage of specialized tools required for repairs.

Estimated Pages:

Over 2000 pages (typical for a complete factory manual).

Type:

Factory Service Manual (FSM) / Repair Manual

Language:

English

Format:

Digital (Printable PDF)

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, cylinder head, pistons, crankshaft, camshaft, timing belt/chain, lubrication system, cooling system.

Engine Performance:

Fuel injection system, ignition system, emissions control system, turbocharger system (if applicable).

Transmission Manual:

Clutch system, manual transmission assembly, disassembly, gears, bearings, seals.

Transmission Automatic:

Automatic transmission assembly, disassembly, torque converter, valve body, hydraulic control.

Drivetrain:

All-Wheel Drive (AWD) system, viscous coupling, center differential, rear differential, driveshafts, CV joints.

Suspension:

Front and rear suspension components, struts, shocks, control arms, sway bars, bushings.

Steering:

Power steering system, steering rack, tie rods, steering column.

Brakes:

Brake system components (master cylinder, calipers, pads, rotors), ABS system, parking brake.

Electrical System:

Battery, charging system (alternator), starting system, lighting, accessories, fuses, relays.

Body And Frame:

Body panel removal/installation, interior trim, exterior trim, glass, sunroof.

HVAC:

Heating, ventilation, and air conditioning system components, refrigerant, controls.

Safety Systems:

Airbag system, seat belt system.

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs.

Component Replacement:

Replacement of worn or failed parts like alternators, starters, water pumps, fuel pumps, etc.

Engine Rebuild:

Complete engine disassembly and reassembly procedures.

Transmission Overhaul:

Detailed procedures for overhauling both manual and automatic transmissions.

Brake Service:

Brake pad and rotor replacement, brake fluid flush, caliper service.

Suspension And Steering Repair:

Replacement of struts, shocks, ball joints, bushings, and steering components.

Electrical Diagnostics:

Troubleshooting electrical faults using diagrams and test procedures.

Drivetrain Service:

Service and repair of AWD system components, CV joints, and differentials.

HVAC Service:

Refrigerant recharge, component replacement (compressor, condenser, evaporator).

Body And Interior Repair:

Panel replacement, interior trim fitting, glass replacement.

Depth:

Full factory level diagnostics, repair, and overhaul procedures.

Diagnostic Troubleshooting:

Includes diagnostic trouble codes (DTCs) and specific troubleshooting trees.

Torque Specifications:

Precise torque values for all fasteners.

Clearances And Tolerances:

Specifications for engine internal clearances, bearing tolerances, etc.

📊 Manual Specifications

File Type:

PDF

Printability:

High-resolution scans, allowing for clear printing of all pages or sections.

Searchability:

Text-searchable PDF for quick information retrieval.

Binding Method:

N/A (Digital Product)

Paper Quality:

N/A (Digital Product)

⚙️ Engine Specifications

Engine Code Base:

EJ20 (various configurations), EJ25

Displacement Base:

2.0L (1994cc) and 2.5L (2457cc)

Configuration:

Horizontally-opposed (Boxer) 4-cylinder

Aspirated Power Specs:

e.g., 2.5i: 165 hp @ 5600 rpm, 166 lb-ft @ 4000 rpm

Turbocharged Power Specs:

e.g., WRX: 227-230 hp @ 5600 rpm, 236-240 lb-ft @ 3600 rpm; WRX STI: 300 hp @ 6000 rpm, 300 lb-ft @ 4000 rpm

Compression Ratio Base:

Typically 8.5:1 to 10.0:1 depending on engine variant.

Redline Base:

Approximately 6500-7000 rpm for naturally aspirated, 7000-7500 rpm for turbocharged.

Fuel Delivery:

Multi-point fuel injection (MPI) or Sequential Electronic Fuel Injection (SEFI).

Fuel Type:

Unleaded Gasoline (91 octane or higher recommended for WRX/STI).

🔧 Transmission

Transmission Type Base:

5-speed Manual Transmission (MT)

Transmission Type Optional:

4-speed Automatic Transmission (AT) with Sportshift on some models.

AWD Coupling:

Driver Controlled Center Differential (DCCD) on STI, Viscous Coupling AWD on other models.

Manual Gear Ratios:

Varies by model and engine. Specific ratios detailed in the manual.

Automatic Gear Ratios:

Fixed ratios for 4-speed automatic. Specific ratios detailed in the manual.

📐 Dimensions

Length:

Sedan: ~174.5 inches, Wagon: ~175.8 inches (varies slightly by year/trim).

Width:

~68.1 inches

Height:

Sedan: ~56.1 inches, Wagon: ~57.0 inches (varies slightly).

Wheelbase:

~104.0 inches

Curb Weight:

Approx. 2900-3400 lbs, depending on configuration and drivetrain.

Gross Vehicle Weight Rating:

Varies by model, typically around 4200-4500 lbs.

🛡️ Safety Features

NHTSA Front Crash:

Good (for models tested).

IIHS Side Impact:

Good (for models tested).

ABS:

Standard Anti-lock Braking System (ABS).

Traction Control:

Traction Control System (TCS) often standard or available.

Electronic Stability:

Vehicle Dynamics Control (VDC) often standard on higher trims or available.

Airbags:

Front airbags, available side-impact airbags and curtain airbags.

Seatbelts:

Three-point seatbelts with pretensioners and force limiters.

💡 Technology Features

Head Unit:

Factory-installed CD player, optional premium audio systems, auxiliary input jacks on later models.

Display:

Basic digital display for clock, radio, and climate controls. Advanced displays were not common in this era.

Cruise Control:

Standard on most trims.

All Wheel Drive:

The core technological feature, enhancing stability and traction in various conditions.

Usb Ports:

Not typically factory equipped; aftermarket solutions are common.

Bluetooth:

Not factory equipped; aftermarket solutions are common.

🔧 Maintenance

Oil Change Interval:

Typically 3,750 miles or 6 months, but check manual for specific oil type and conditions (synthetic oil can extend intervals).

Spark Plug Replacement:

Intervals vary by plug type (copper, platinum, iridium), often around 30,000-60,000 miles.

Timing Belt Replacement:

For EJ20/EJ25 engines with timing belts: 105,000 miles or 7 years is a common interval. Models with timing chains do not have this interval.

Coolant Flush:

Typically every 30,000 miles or 2 years.

Engine Oil Type:

API SG, SH, SJ, or higher; SAE 5W-30 or 10W-30 recommended (refer to manual for exact specification).

Transmission Fluid Manual:

API GL-4 or GL-5 gear oil, SAE 75W-90 or 80W-90 (check specific manual).

Transmission Fluid Automatic:

Subaru ATF-HP or equivalent.

Coolant Type:

Subaru Super Coolant (blue) or equivalent ethylene glycol-based coolant.

Brake Fluid Type:

DOT 3 or DOT 4.

Head Gaskets:

While less prevalent than on earlier Subaru models, head gasket leaks can still occur, especially on EJ25 engines. The manual will detail inspection and replacement procedures.

Turbocharger Issues:

On WRX/STI models, oil starvation or turbocharger failure can occur if maintenance is neglected or if the turbo is abused without proper cooldown. Manual covers turbo inspection and replacement.

Clutch Wear:

Clutch wear is typical for manual transmissions, especially with spirited driving. Manual provides clutch inspection and replacement details.

Suspension Wear:

Bushings, ball joints, and struts can wear over time, leading to noise or handling issues. Manual details diagnostics and replacement.

Oil Consumption:

Some EJ25 engines may exhibit higher oil consumption. Regular checks are advised. Manual covers oil level checks and related diagnostics.

📚 Vehicle History

Subaru Identity:

Known for Symmetrical All-Wheel Drive, horizontally opposed engines, and rallying heritage.

Generation Introduction:

The 2nd generation Impreza (GD/GG) debuted in 2000 (Japan) and 2001 (North America) for the 2002 model year, significantly revising styling and platforms from the previous generation.

Facelifts:

Received a significant facelift for the 2004 model year, particularly for WRX/STI models, introducing the distinctive 'bug-eye' headlights (pre-2004) to 'hawk-eye' (2004-2005) and 'wide-body' (2006 STI) designs.

Manufacturing Locations:

Primarily manufactured in Japan (Gunma Plant).

Rally Success:

This generation continued Subaru's success in the World Rally Championship (WRC) with the Impreza WRX STI.

🏆 Awards & Recognition

Car And Driver Ten Best:

Impreza WRX was frequently named to Car and Driver's 10Best list during this generation, particularly the WRX and WRX STI variants, for their performance and value.

Wrc Titles:

While the 2nd generation Impreza chassis achieved significant rally success, the specific years and drivers are tied to the WRC program's ongoing achievements during this period.