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SUBARU 2001 2002 IMPREZA WRX STI Service Workshop Manual General Information Engine Transmission CHASSIS BODY Wiring System
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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Model Code: GDB (chassis code for this generation) Year: 2001, 2002 Generation Generation: Second Generation (GD/GG) Generation Code: GD (Sedan),...
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🏷️ Basic Information
Identification
Make:
Subaru
Model:
Impreza WRX STI
Model Code:
GDB (chassis code for this generation)
Year:
2001, 2002
Generation
Generation:
Second Generation (GD/GG)
Generation Code:
GD (Sedan), GG (Wagon)
Codes
Chassis Codes Covered:
GDB
👋 Introduction
Market Position
Market Position:
The Subaru Impreza WRX STI of this era (GC8/GD chassis) was a dominant force in the rally-bred performance sedan segment, offering exceptional handling, a powerful turbocharged engine, and Subaru's signature Symmetrical All-Wheel Drive system.
Competitive Analysis
Competitive Analysis:
Competed directly with vehicles like the Mitsubishi Lancer Evolution, Ford Focus RS, and Volkswagen Golf R, but differentiated itself with its unique engine layout, AWD system, and rally heritage.
Key Features
Key Features:
• Legendary EJ207 turbocharged boxer engine
• Symmetrical All-Wheel Drive system
• Close-ratio 6-speed manual transmission
• Advanced DCCD (Driver Controlled Center Differential)
• Performance-tuned suspension
• Aggressive aerodynamic styling
• High-revving, responsive engine character
📋 Manual Details
Coverage Areas
Coverage Areas:
• General Information
• Engine
• Transmission
• Chassis
• Body
• Wiring System
Page Count
Estimated Page Count:
1500+
Manual Type
Manual Type:
Service Workshop Manual (Supplement for STi)
Language
Language:
English
Format
Format:
PDF
📖 Manual Coverage
Systems Covered
Systems Covered:
• Engine mechanicals (EJ207)
• Engine management and diagnostics (ECU, sensors)
• Fuel system (injection, pump, filter)
• Cooling system
• Lubrication system
• Ignition system
• Exhaust system
• Manual transmission (TY856WR1MA)
• Clutch system
• Driveshafts and differentials (center, front, rear)
• Suspension (front MacPherson strut, rear multi-link)
• Steering system
• Brake system (ABS, calipers, rotors)
• Wheels and tires
• Body structure and panels
• Interior trim and components
• Exterior lighting
• HVAC system
• Electrical system (battery, charging, starting)
• Power windows and locks
• Audio system
• Airbag system
• Wiring diagrams for all circuits
Procedures Included
Procedures Included:
• Routine maintenance (oil change, filter replacement, spark plugs)
• Engine troubleshooting and diagnostics
• Engine component removal and installation (pistons, crankshaft, camshafts)
• Transmission overhaul and repair
• Clutch replacement
• Suspension component replacement and alignment procedures
• Brake system bleeding and component replacement
• Electrical system diagnostics and repair
• Wiring harness repair and tracing
• Body panel alignment and repair
• Interior trim removal and installation
• Fault code retrieval and interpretation
• Torque specifications for critical fasteners
• Fluid level checks and capacities
Technical Depth
Technical Depth:
Comprehensive, from basic adjustments to major overhauls and rebuilds. Detailed troubleshooting charts, diagnostic procedures, and repair instructions suitable for professional technicians and advanced enthusiasts.
📊 Manual Specifications
File Format
File Format:
PDF
Print Quality
Print Quality:
High-resolution, suitable for printing individual sections or the entire manual. Clear diagrams and images.
Binding Type
Binding Type:
N/A (Digital PDF)
Paper Type
Paper Type:
N/A (Digital PDF)
⚙️ Engine Specifications
Primary Engine
Engine Code:
EJ207
Engine Type:
Horizontally Opposed (Boxer), 4-Cylinder, DOHC, 16-Valve, Twin-Scroll Turbocharged
Displacement:
1994 cc (2.0 Liters)
Performance
Horsepower:
280 PS (276 bhp) @ 6400 rpm (JDM/European spec)
Torque:
35.0 kg-m (253 lb-ft) @ 4400 rpm (JDM/European spec)
Fuel System
Fuel Injection:
Electronic Multi-Point Fuel Injection (MPI)
Fuel Type:
Unleaded Premium Unleaded Gasoline (98 RON recommended)
Cooling System
Cooling System Type:
Pressurized Liquid Cooling
Lubrication System
Oil Capacity:
4.5 Liters (4.8 US Quarts) with filter change
🔧 Transmission
Standard
Transmission Type:
6-Speed Manual
Transmission Model Code:
TY856WR1MA
Optional
Optional Transmission:
None (STI models were exclusively manual)
Features
Dccd:
Driver Controlled Center Differential (Allows manual adjustment of front/rear torque split)
Gear Ratios 1 To 6:
3.167 / 2.133 / 1.545 / 1.137 / 0.939 / 0.761 (Typical ratios for TY856 WR1MA)
Transmission Fluid Type:
GL-5, SAE 75W-90 (Manual Transmission Fluid)
Transmission Fluid Capacity:
3.1 Liters (3.3 US Quarts) (Manual Transmission)
📐 Dimensions
Exterior
Wheelbase:
2510 mm (98.8 inches)
Length:
4405 mm (173.4 inches) (Sedan)
Width:
1770 mm (69.7 inches)
Height:
1440 mm (56.7 inches) (Sedan)
Weights
Curb Weight:
Approximately 1340 kg (2954 lbs)
Gross Vehicle Weight Rating:
Approximately 1800 kg
Towing Capacity:
Not Recommended
🛡️ Safety Features
Ratings
NHTSA Front Impact Rating:
4/5 Stars (for similar models of the era)
IIHS Frontal Offset Rating:
Good (for similar models of the era)
Active Features
Active Safety Features:
• Anti-lock Braking System (ABS)
• Electronic Brake-force Distribution (EBD)
• Driver Controlled Center Differential (DCCD)
Passive Features
Passive Safety Features:
• Driver and front passenger airbags
• Side curtain airbags (optional/later models)
• Reinforced chassis structure
• 3-point height-adjustable seatbelts with pre-tensioners
• Whiplash protection seats
💡 Technology Features
Infotainment
Infotainment System:
Basic factory audio system with CD player and AM/FM radio. Limited connectivity options by modern standards.
Driver Assistance
Driver Assistance Features:
• ABS
• EBD
• DCCD (Driver Controlled Center Differential)
Connectivity
Connectivity Features:
Limited, typically manual key ignition, basic power accessories. OBD-II port for diagnostics.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Every 3,000-5,000 miles (5,000-8,000 km) or 3-6 months, depending on driving conditions. High-performance driving may warrant more frequent changes.
Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on inspection.
Spark Plug Replacement:
Every 30,000-60,000 miles (48,000-96,000 km) (Depending on plug type, platinum/iridium recommended).
Timing Belt Replacement:
Every 60,000-100,000 miles (96,000-160,000 km) or 5-7 years. Crucial for EJ series engines.
Fluid Specifications
Engine Oil Specification:
SAE 0W-30 or 5W-30 Synthetic (API SM/SN or equivalent) for optimal performance and protection.
Coolant Type:
Subaru Super Coolant (Blue) or equivalent ethylene glycol-based antifreeze/coolant.
Brake Fluid Type:
DOT 3 or DOT 4 High-Temperature Brake Fluid.
Power Steering Fluid Type:
Subaru Genuine ATF-HP or equivalent Dexron III/Mercon compatible ATF.
Known Issues
Known Issues Engine:
• Head gasket leaks (less common on EJ207 compared to some other Subaru engines, but still a concern)
• Turbocharger failure (oil starvation, wastegate issues)
• Piston ring land failure (ringland failure) from detonation/abuse
• Fuel injector clogging
• Oil consumption
Known Issues Transmission:
• Wear on synchros (especially 1st and 2nd gear)
• Clutch wear
• DCCD actuator issues
Known Issues Chassis:
• Wheel bearing wear
• Brake rotor warping (under heavy use)
• Strut mount wear
📚 Vehicle History
Brand Heritage
Brand Heritage:
Subaru has a long history in motorsport, particularly in rallying, dating back to the 1970s. This heritage directly influenced the development and appeal of the WRX and WRX STI models.
Model Evolution
Model Evolution Wrx Sti:
The WRX STI (Subaru Tecnica International) is the high-performance variant of the Impreza, featuring more powerful engines, enhanced suspension, larger brakes, and distinct styling cues derived from Subaru's rally program. This 2001-2002 generation marked the transition to the 'GD' chassis, a significant redesign from the previous 'GC8' generation.
Production
Production Period:
Second Generation Impreza (GD/GG): 2000-2007 (WRX STI variants within this period).
Manufacturing Location:
Japan
🏆 Awards & Recognition
Recognitions
Rally Heritage Accolades:
The Impreza platform, particularly the WRX and WRX STI variants, has a celebrated history in the World Rally Championship (WRC), securing multiple driver and manufacturer titles.
Automotive Press Awards:
Frequently praised by automotive journalists for its handling, performance, and rally-inspired driving dynamics. Often featured on 'best of' lists for affordable performance cars.