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2003 Subaru Impreza Workshop Service Repair Manual
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🏷️ Basic Information Identification Make: Subaru Model: Impreza Model Variant: Second generation (GD chassis) - 2.5 RS, WRX, WRX STI variants Model Years Covered: 2003 Body Styles: Sedan and 5-door...
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🏷️ Basic Information
Identification
Make:
Subaru
Model:
Impreza
Model Variant:
Second generation (GD chassis) - 2.5 RS, WRX, WRX STI variants
Model Years Covered:
2003
Body Styles:
Sedan and 5-door wagon
Drivetrain:
Symmetrical All-Wheel Drive (standard)
👋 Introduction
Market Position
Target Audience:
Compact car buyers seeking all-weather capability, rally-inspired performance, and DIY-friendly mechanicals
Segment:
Compact / sport sedan and wagon
Key Competitors:
Mitsubishi Lancer, Honda Civic, Mazda Protege, Volkswagen Jetta
Competitive Advantage
Drivetrain:
Standard symmetrical all-wheel drive - rare in the compact class
Performance:
Turbocharged WRX offering near-sports-car acceleration at a mainstream price
Mechanical Design:
Low-mounted boxer engine gives a low center of gravity and balanced handling
Key Features
Engine Layout:
Horizontally opposed (boxer) 4-cylinder
AWD System:
Full-time all-wheel drive with center differential options
Rally Heritage:
Multiple World Rally Championship titles inform WRX development
📋 Manual Details
Manual Specifications
Manual Type:
Factory workshop service repair manual
Language:
English
Format:
PDF
Delivery Method:
Instant digital download
Compatibility:
Windows, Mac, tablets, smartphones - any PDF reader
Printability:
Printable pages for shop or home use
Manual Scope
Intended Users:
Professional technicians and DIY owners
Procedure Style:
Step-by-step repair and overhaul procedures with torque specifications
Wiring Information:
Includes electrical schematics and troubleshooting charts
📖 Manual Coverage
Systems Covered
Engine:
EJ253 naturally aspirated and EJ205 turbocharged boxer engines - complete teardown, rebuild, and reassembly
Engine Lubrication:
Oil pump, filter, pressure testing, capacity charts
Cooling System:
Radiator, thermostat, water pump, coolant replacement and testing
Fuel and Emission Systems:
Fuel pump, injectors, throttle body, evaporative emissions, OBD-II diagnostics
Intake and Exhaust:
Turbocharger, intercooler, up-pipe, down-pipe, catalytic converter, muffler
Transmission:
5-speed manual, 4EAT automatic, clutch, differentials, viscous coupling
Driveline:
Front and rear axles, driveshaft, CV joints, AWD transfer components
Suspension:
MacPherson struts front and rear, coil springs, control arms, bushings, alignment specs
Brakes:
Disc pads, rotors, calipers, master cylinder, ABS system, parking brake
Steering:
Hydraulic power steering rack and pinion, pump, linkage
Electrical:
Starting, charging, lighting, gauges, relays, complete wiring diagrams
HVAC:
Heater core, blower, A/C compressor, refrigerant service
Body and Frame:
Panel removal, bumper, doors, glass, seals, corrosion repair
Restraints:
Seat belts, SRS airbag components and precautions
Wheels and Tires:
Sizes, balancing, lug torque specifications
Procedures Included
Diagnostics:
Fault code reading and troubleshooting flowcharts
Removal and Installation:
Component R&I procedures for all major assemblies
Disassembly and Reassembly:
Engine, transmission, and differential overhaul sequences
Adjustments:
Valve clearance, belt tension, alignment, throttle position
Torque Specifications:
Factory torque values for every fastener group
Maintenance Schedules:
Service intervals and fluid capacity charts
Technical Depth
Detail Level:
Factory-level data used by dealership service departments
Illustrations:
Exploded diagrams, schematics, and photographs
Special Tools:
Lists required special service tools for each procedure
Parts Information
Part Numbers:
Factory part numbers referenced throughout procedures
Fluid Specifications:
Approved oil, coolant, transmission, and brake fluid types
Fastener Data:
Bolt sizes, grades, and tightening sequences
📊 Manual Specifications
File & Compatibility
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print & Binding
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
⚙️ Engine Specifications
Primary Engine
Engine Code:
EJ253 (2.5 RS) / EJ205 turbo (WRX)
Configuration:
Horizontally opposed 4-cylinder (boxer)
Displacement:
2.5 liters (2457 cc)
Bore x Stroke:
99.5 mm x 79.0 mm
Compression Ratio:
9.5:1 (2.5 RS) / 8.0:1 (WRX turbo)
Valvetrain:
SOHC 16-valve (2.5 RS) / DOHC 16-valve (WRX)
Performance
Horsepower (2.5 RS):
Approximately 165 hp @ 5,600 rpm
Torque (2.5 RS):
Approximately 166 lb-ft @ 4,000 rpm
Horsepower (WRX):
227 hp @ 6,000 rpm
Torque (WRX):
217 lb-ft @ 4,000 rpm
Fuel System
Type:
Sequential multi-port fuel injection
Fuel Required:
87 octane (2.5 RS) / 91+ octane premium (WRX)
Fuel Tank Capacity:
Approximately 16.9 gallons (64 liters)
🔧 Transmission
Standard Transmission
Type:
5-speed manual with full-time all-wheel drive
Clutch:
Single dry plate, hydraulic actuation
Center Differential:
Viscous coupling limited-slip (manual)
Optional Transmission
Type:
4-speed automatic (4EAT) with AWD
Features:
Computer-controlled shifting, power/normal modes on some trims
Drivetrain Features
AWD Layout:
Symmetrical full-time all-wheel drive
Differential Oil:
GL-5 gear oil per capacity chart in manual
Transmission Fluid (Auto):
Dexron-type ATF per manual specification
📐 Dimensions
Exterior
Wheelbase:
Approximately 99.1 in (2,520 mm)
Length:
Approximately 174 in (4,420 mm) sedan
Width:
Approximately 68.5 in (1,740 mm)
Height:
Approximately 55.5 in (1,410 mm)
Weights
Curb Weight:
Approximately 2,910-3,230 lbs depending on trim
🛡️ Safety Features
Ratings
Crash Test Ratings:
N/A - refer to NHTSA/IIHS archives for official 2003 test results
Active Features
ABS:
4-wheel anti-lock braking system
Traction:
All-wheel drive traction advantage in all conditions
Passive Features
Airbags:
Dual front airbags; side airbags on some trims
Restraints:
3-point seat belts with pretensioners
Structure:
Reinforced passenger safety cell body construction
💡 Technology Features
Infotainment
Audio System:
AM/FM/CD head unit; premium audio available on higher trims
Wiring Support:
Complete audio circuit schematics included in manual
Driver Assistance
ADAS Systems:
N/A - no modern ADAS features on this model year
Instrumentation:
Digital climate and trip computer functions on equipped trims
🔧 Maintenance
Service Intervals
Oil and Filter:
Every 3,750 miles or 3.75 months (severe) / 7,500 miles (normal)
Air Filter:
Inspect at oil changes, replace as needed
Spark Plugs:
Replace per interval chart; turbo plugs more frequently
Coolant:
Inspect regularly; replace at scheduled interval
Timing Belt:
Inspect and replace at approximately 105,000 miles
Brake Fluid:
Replace every 2-3 years
Manual Transmission / Diff Oil:
Replace at scheduled intervals
Fluid Specifications
Engine Oil:
5W-30 API SL or better; capacity per manual chart
Coolant:
Subaru genuine long-life coolant
ATF:
Dexron-type automatic transmission fluid
Gear Oil:
GL-5 gear oil for differentials
Known Issues / Common Wear
Head Gaskets:
2.5L naturally aspirated EJ engines known for head gasket seepage at higher mileage
Wheel Bearings:
Rear wheel bearing wear common on high-mileage cars
Exhaust:
Rust on exhaust components in road-salt climates
📚 Vehicle History
Brand Heritage
Manufacturer:
Subaru Corporation (Fuji Heavy Industries), Japan
Signature Engineering:
Boxer engine and symmetrical all-wheel drive since the 1970s
Motorsport Pedigree:
World Rally Championship success drove WRX development
Model Evolution
First Generation:
1992-2000 Impreza (GC chassis) established the compact AWD niche
Second Generation:
2000-2007 (GD chassis) with WRX arriving in the US market in 2002
2003 Model Year:
Refined GD platform with expanded trim lineup
Production Location
Assembly Plant:
Gunma, Japan
🏆 Awards & Recognition
Recognitions
Motor Trend:
Subaru named Motor Trend Import Brand of the Year in the early 2000s era
Rally Heritage:
Subaru WRC drivers' championships (1995, 1996, 1997) underpinned WRX credibility
Market Recognition:
WRX widely recognized as a performance value benchmark in the compact segment
Official Awards:
N/A - refer to period publications for specific 2003 award listings