🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Year:

2006

Chassis Code:

GDB (for WRX STI, WRX) / GD (for non-turbo models)

Platform:

Subaru Global Platform (This is a placeholder as 2006 Impreza was on the 'GD' platform, which predates the Global Platform; the manual would cover the GD platform)

👋 Introduction

Segment:

Compact Car / Performance Compact

Usp:

Symmetrical All-Wheel Drive (standard on most trims), rally-inspired performance (WRX/STI variants)

Competitors:

Honda Civic Si, Mitsubishi Lancer Evolution (closest performance rival), Volkswagen GTI, Mazdaspeed3

Design Philosophy:

Robust, practical, and performance-oriented, often with aggressive styling for WRX/STI models

Target Demographic:

Enthusiasts, drivers seeking all-weather capability and performance

📋 Manual Details

Primary Focus:

Repair and Service Procedures

Intended Audience:

Professional Technicians and Enthusiast DIYers

Estimated Pages:

Over 2000 pages (typical for comprehensive factory service manuals)

Type:

Factory Service Manual (FSM) / Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, cylinder head, pistons, crankshaft, lubrication system, cooling system, timing belt/chain, seals, gaskets

Engine Performance:

Fuel delivery, ignition system, emissions control, turbocharging (for WRX/STI models), variable valve timing (VVT)

Transmission Manual:

Clutch system, gear shifting mechanisms, internal components, fluid specifications, service procedures

Transmission Automatic:

Torque converter, planetary gears, hydraulic control, solenoids, fluid specifications, service procedures

Drivetrain:

All-Wheel Drive (AWD) system, center differential, rear differential, driveshafts, CV joints, wheel bearings

Suspension:

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

Steering:

Power steering system, steering rack, tie rods, steering column, alignment specifications

Brakes:

Brake system components (discs, pads, calipers, master cylinder, ABS), hydraulic lines, bleeding procedures, parking brake

Electrical System:

Battery, charging system, starter, lighting system, power windows, mirrors, locks, wipers, horn

Body And Chassis:

Body panel removal/installation, doors, hood, trunk, interior trim, chassis lubrication, corrosion prevention

HVAC:

Heating, Ventilation, and Air Conditioning (HVAC) system, refrigerant, compressor, evaporator, heater core, controls

Safety Systems:

Airbag system, seat belt pre-tensioners, SRS wiring

Routine Maintenance:

Oil changes, filter replacements, fluid checks/changes, spark plug replacement, air filter replacement

Diagnostics And Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting, electrical testing, mechanical testing

Component Repair And Replacement:

Detailed steps for replacing all major and minor components

Rebuilding Procedures:

Engine and transmission rebuilding specifications and procedures

Technical Specifications Data:

Torque values, clearances, fluid capacities, electrical specifications, diagnostic parameters

Wiring Diagrams:

Comprehensive electrical wiring schematics for all systems

Depth:

Comprehensive (Factory Level)

Detail Level:

Includes detailed disassembly, assembly, and diagnostic procedures with illustrations and schematics

📊 Manual Specifications

File Type:

PDF

Searchability:

Text-searchable PDF

Printability:

Printable (designed for printing individual sections or the entire manual)

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Code Naturally Aspirated:

EJ253 (2.5L SOHC)

Engine Code Turbocharged:

EJ255 (WRX) / EJ257 (STI)

Displacement Naturally Aspirated:

2457 cc (2.5 Liters)

Displacement Turbocharged:

2457 cc (2.5 Liters)

Horsepower Naturally Aspirated:

Approx. 173 hp @ 5600 rpm (varies slightly by market/trim)

Torque Naturally Aspirated:

Approx. 166 lb-ft @ 4000 rpm

Horsepower Wrx:

Approx. 227 hp @ 5600 rpm

Torque Wrx:

Approx. 236 lb-ft @ 3600 rpm

Horsepower Sti:

Approx. 300 hp @ 6000 rpm

Torque Sti:

Approx. 300 lb-ft @ 4000 rpm

Fuel Type:

Unleaded Gasoline (91+ Octane recommended for WRX/STI)

Injection Type:

Multi-port Fuel Injection (MPI)

Forced Induction:

Intercooled Turbocharger (WRX/STI models)

🔧 Transmission

Type Naturally Aspirated:

5-Speed Manual

Type Turbocharged:

5-Speed Manual (WRX), 6-Speed Manual (STI)

Type Automatic:

4-Speed Automatic (available on some non-turbo trims)

AWD System:

Subaru Symmetrical All-Wheel Drive (Active Locking Center Differential on manual, viscous on automatic)

Sti Dccd:

Driver-Controlled Center Differential (DCCD) on STI models

📐 Dimensions

Length:

Approx. 173.8 inches

Width:

Approx. 68.1 inches

Height:

Approx. 56.1 inches

Wheelbase:

Approx. 99.9 inches

Cargo Volume:

Approx. 11.4 cu ft (Sedan)

Curb Weight:

Approx. 2900 - 3300 lbs (varies by trim and transmission)

🛡️ Safety Features

NHTSA Front Impact:

Good (for both driver and passenger, 2006 models)

IIHS Side Impact:

Good (2006 models)

IIHS Rear Impact:

Acceptable (2006 models)

ABS:

Standard

Traction Control:

Available on some trims

Electronic Stability Control:

Available on some trims

Airbags Front:

Standard

Airbags Side Curtain:

Available on some trims

Seatbelts:

3-point with pre-tensioners

💡 Technology Features

Head Unit:

Factory single-DIN or double-DIN radio with CD player, AM/FM tuner. Optional premium audio system.

Display:

Basic digital display for climate control and clock. No integrated navigation or touchscreens.

Cruise Control:

Standard

ABS:

Standard

Aux Input:

Available on some models via aftermarket or factory options

Bluetooth:

Not typically factory-equipped in 2006, but manual would cover wiring for aftermarket installations.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 3 months (severe conditions) / 7,500 miles or 6 months (normal conditions)

Engine Air Filter:

Replace every 15,000 miles or 12 months

Cabin Air Filter:

Replace every 15,000 miles or 12 months

Spark Plugs:

Replace every 60,000 miles (NGK Platinum/Iridium Recommended)

Timing Belt:

Replace every 105,000 miles or 7 years (for EJ253/EJ255/EJ257 with timing belt)

Engine Oil Type:

5W-30 Synthetic (API SG, SH, SJ, SL or SM)

Engine Oil Capacity:

4.7 US quarts (with filter)

Coolant Type:

Subaru Super Coolant (Blue) or equivalent (50/50 mix)

Transmission Fluid Manual:

API GL-4 or GL-5 Gear Oil (e.g., Subaru Extra-S, or equivalent)

Transmission Fluid Automatic:

Subaru ATF-HP (High Performance) or equivalent

Differential Fluid Front Rear:

API GL-5 Gear Oil (SAE 75W-90)

Brake Fluid Type:

DOT 3 or DOT 4

Head Gaskets:

Premature failure of head gaskets (especially on EJ25 SOHC engines), though less common than previous generations. Manual would cover diagnosis and replacement.

Clutch Wear:

Can experience faster clutch wear under aggressive driving conditions. Manual covers clutch inspection and replacement.

Turbocharger Issues:

Oil starvation or contamination can lead to turbo failure on WRX/STI models. Manual details lubrication and inspection.

Suspension Bushings:

Wear on suspension bushings can lead to noise and handling issues. Manual covers inspection and replacement of bushings.

📚 Vehicle History

Manufacturer Origin:

Japan

Core Competency:

All-Wheel Drive, Boxer Engines, Rallying Heritage

Generation:

Second Generation (GD/GG)

Redesign Year:

2000 (initial launch), facelift in 2002 and 2005

Production Years:

2000-2007

Manufacturing Locations:

Japan

🏆 Awards & Recognition

Car And Driver Oti:

Car and Driver's 10Best Trucks and SUVs (2006 Impreza Outback Sport variant recognized for its practicality and AWD)

Raly Success:

Subaru Impreza WRX/STI variants have a strong lineage of success in motorsports, particularly in the World Rally Championship (WRC), contributing to the model's enthusiast appeal.