🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Model Code:

GDB (Type RA/STI)

Year:

2001-2002

Chassis Code:

GDB

Engine Code Primary:

EJ207

Engine Code Variant Sti:

EJ207 Twin-Scroll Turbo

👋 Introduction

Vehicle Segment:

Compact Sports Sedan / Rally Homologation Special

Target Audience:

Enthusiasts, performance drivers, rally fans, owners seeking in-depth maintenance and repair knowledge.

Key Competitors Era:

Mitsubishi Lancer Evolution, Honda Civic Type R, Toyota Celica GT-Four, Ford Focus RS.

Vehicle Usp:

Symmetrical All-Wheel Drive, turbocharged boxer engine, rally-bred performance, Driver's Control Centre Differential (DCCD).

Why This Manual:

Provides authorized, detailed procedures directly from Subaru, crucial for maintaining and repairing a complex performance vehicle like the STI.

📋 Manual Details

Primary Coverage:

2001-2002 Subaru Impreza WRX STI (GDB chassis)

Secondary Coverage:

General Impreza WRX (GC8/GF8 chassis variations may have overlaps but this is STI specific)

Estimated Page Count:

Approximately 2500-3500 pages (typical for comprehensive FSMs, exact number often not specified for digital files but implied by scope)

Manual Type:

Factory Service Manual (FSM) / Repair Manual / Workshop Manual

Language:

English

File Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Detailed breakdown of EJ207 engine components, including pistons, connecting rods, crankshaft, cylinder heads, camshafts, timing belt/chain, lubrication system, cooling system.

Engine Management:

Fuel injection, ignition system, emission control systems, ECU diagnostics, sensor operations, wiring diagrams for engine sensors.

Transmission Drivetrain:

Manual transmission (TY756/TY856 variants), clutch system, all-wheel-drive system (DCCD - Driver's Control Centre Differential), front and rear differentials, driveshafts, axles.

Suspension Steering:

Front and rear suspension systems (MacPherson strut front, multi-link rear), steering rack, power steering system, wheel alignment specifications.

Brakes:

Brake system components (ABS, EBD), brake fluid specifications, master cylinder, brake lines, calipers, rotors, parking brake, hydraulic and electrical diagnostics.

Electrical:

Complete electrical system schematics, battery, charging system, starter motor, lighting systems, power windows, door locks, central locking, security system, gauge cluster, SRS (Airbag) system.

Body Interior:

Body panel repair, door mechanisms, interior trim removal and installation, seating systems, HVAC system, dashboard components, structural repair guidelines.

Maintenance:

Scheduled maintenance procedures, oil changes, filter replacements, spark plug replacement, brake fluid flush, coolant flush, transmission fluid changes, differential fluid changes.

Diagnostics:

Troubleshooting guides for common issues, diagnostic trouble codes (DTCs), specific system diagnostic flows, electrical circuit testing.

Repair:

Detailed step-by-step repair procedures for all major vehicle systems, including engine rebuild, transmission overhaul, suspension component replacement, brake caliper rebuild, body panel repair.

Installation:

Procedures for installing and replacing major components, including engine, transmission, turbocharger, intercooler, suspension parts, and body components.

Specifications Data:

Torque specifications for all fasteners, component clearances, fluid capacities, electrical specifications, measurement data.

Depth Level:

Comprehensive. Covers basic maintenance through complete engine and transmission overhauls, including advanced electrical diagnostics and body repair.

Diagnostic Focus:

In-depth diagnostic trees, resistance values, voltage checks, signal patterns for sensors and actuators.

Rebuild Information:

Detailed procedures and specifications for rebuilding major mechanical assemblies like engines and transmissions.

📊 Manual Specifications

File Type:

PDF

Searchability:

Likely text-searchable PDF, enabling quick navigation to specific topics.

Printability:

Designed for printing, allowing users to create physical copies for workshop use.

Binding Style If Printed:

N/A (Digital PDF)

Paper Type If Printed:

N/A (Digital PDF)

⚙️ Engine Specifications

Engine Type:

Horizontally-opposed (Boxer), 4-cylinder, 16-valve, DOHC

Displacement:

2.0 Liters (1994 cc)

Aspiration:

Twin-Scroll Turbocharged Intercooled

Horsepower Ps:

265 PS (approx. 261 hp) at 6400 rpm (JDM specification)

Torque Nm:

343 Nm (approx. 253 lb-ft) at 4400 rpm (JDM specification)

Bore X Stroke Mm:

92.0 mm x 75.0 mm

Compression Ratio:

8.0:1

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Unleaded Gasoline (Premium Octane Recommended)

ECU Type:

Subaru ECU (specific part numbers detailed in manual)

🔧 Transmission

Transmission Type:

6-Speed Manual

Transmission Model:

TY756 (later superseded by TY856 for some variants)

Optional Transmission:

N/A (STI models of this era were exclusively manual)

Dccd System:

Driver's Control Centre Differential (DCCD) with automatic and manual locking modes.

AWD System:

Symmetrical All-Wheel Drive with viscous coupling center differential (in addition to DCCD).

📐 Dimensions

Length Mm:

4405

Width Mm:

1735

Height Mm:

1450

Wheelbase Mm:

2530

Track Front Mm:

1490

Track Rear Mm:

1490

Curb Weight Kg:

1420 (approx.)

Gross Vehicle Weight Rating Kg:

Not specified in product info, detailed in manual.

Towing Capacity Kg:

Not applicable / Not specified.

🛡️ Safety Features

NHTSA Ratings:

Specific NHTSA ratings for this model and year would be documented in the manual if available for the target market.

Jncsa Ratings:

Often rated highly in Japanese NCAP (JNCAP) for its era.

ABS:

Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD).

Traction Control:

Yes, integrated with AWD and DCCD systems.

Airbags:

Front airbags, side airbags (market dependent).

Seatbelts:

3-point seatbelts with pre-tensioners.

Chassis Structure:

Reinforced body structure for crash safety.

💡 Technology Features

Audio System:

Factory 2-DIN radio/cassette/CD player (specifics vary by market and trim).

Navigation:

Optional factory navigation system available in some markets.

Cruise Control:

Standard on most models.

Stability Control:

Not typically equipped with advanced stability control systems in the modern sense; relies on AWD and DCCD for dynamic control.

Bluetooth:

Not standard; aftermarket integration common.

Intercooler Spray:

Water/Methanol injection system (optional or aftermarket, manual covers system if factory fitted).

🔧 Maintenance

Oil Change Interval:

Typically 5,000-7,500 miles or 6 months (refer to manual for specific conditions and turbocharger considerations).

Timing Belt Replacement Interval:

100,000 miles or 10 years (crucial for EJ207, check manual for exact specification).

Spark Plug Replacement Interval:

Refer to manual; typically 60,000 miles for iridium plugs.

Engine Oil Type Viscosity:

API SG or higher; 5W-30 or 10W-30 recommended (refer to manual for specific STI recommendations and potential synthetic oil usage).

Engine Oil Capacity Liters:

4.5 Liters (with filter change).

Coolant Type:

Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant.

Transmission Fluid Type:

GL-4 or GL-5 gear oil for manual transmission (refer to manual for specific viscosity and type for STI 6-speed).

Differential Fluid Type:

GL-5 gear oil for front and rear differentials (refer to manual for viscosity).

Engine Wear:

Piston ring land failure (especially on heavily tuned or poorly maintained engines), head gasket leaks (less common on EJ207 compared to some other EJ variants, but still possible).

Turbocharger:

Bearing wear, turbo seal leaks, wastegate actuator issues.

Dccd:

Control unit failures, actuator problems (manual addresses diagnostics).

Suspension:

Worn ball joints, bushings, and strut mounts are common due to performance driving.

📚 Vehicle History

Subaru Motorsport Legacy:

Subaru's deep roots in the World Rally Championship (WRC) heavily influenced the development and features of the Impreza STI.

Gc8 To Gdb Transition:

The 2001-2002 models represent the transition to the second generation (GDB) Impreza, moving from the GC8 chassis, with significant chassis and suspension upgrades.

Generation Differences:

Key differences include the GDB's wider track, revised suspension geometry, and the introduction of the DCCD system.

Production Years Global:

2000-2007 (for GDB chassis)

Production Location:

Japan (primarily Gunma Prefecture)

🏆 Awards & Recognition

Rally Championships:

The Impreza WRX STI platform is synonymous with numerous WRC championships won by Subaru Rally Team drivers like Colin McRae, Richard Burns, and Petter Solberg.

Performance Car Awards:

Frequently recognized by automotive publications as a leading performance car of its era for its handling, power, and rally-bred capabilities.

Manual Certification:

Official Subaru Factory Service Manual, indicating it is the definitive guide sanctioned by the manufacturer.