Subaru Impreza 2003 Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2003 Codes Chassis Code: GD, GG Platform: Subaru Global Platform (predecessor) 👋 Introduction Market Position Segment: Compact Car, Rally-Inspired Performance Sedan/Wagon...

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标签: 2003 Car Cars Impreza Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza

Year:

Codes

Chassis Code:

GD, GG

Platform:

Subaru Global Platform (predecessor)

👋 Introduction

Market Position

Segment:

Compact Car, Rally-Inspired Performance Sedan/Wagon

Key Differentiators:

Symmetrical All-Wheel Drive, Boxer Engine, Performance Variants (WRX)

Competitive Analysis

Competitors 2003:

Honda Civic Si, Mitsubishi Lancer Evolution (WRX competitor), Toyota Corolla, Ford Focus

Key Features

Handling Dynamics:

Renowned for its sporty handling and road-holding capabilities, especially in adverse weather conditions.

Powertrain Layout:

Horizontally-opposed (Boxer) engine and Symmetrical All-Wheel Drive offer a low center of gravity and balanced weight distribution.

Performance Variants:

Availability of the iconic WRX model with turbocharged power and enhanced performance features.

📋 Manual Details

Coverage Areas

Primary Coverage:

North America

Secondary Coverage:

Global Markets (technical similarity)

Page Count

Estimated Pages:

1500-2000+

Manual Type

Type:

Factory Repair Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Full Engine Overhaul, Component Testing, Timing

Engine Management:

ECU Diagnosis, Sensor Testing, Fuel Injection, Ignition System

Transmission Manual:

Disassembly, Assembly, Clutch Service, Gearbox Overhaul

Transmission Automatic:

Service Procedures, Fluid Flushing, Valve Body Diagnosis

Drivetrain AWD:

All-Wheel Drive System Service, Center Differential, Rear Differential

Suspension:

Front and Rear Suspension Components, Alignment Specifications, Struts, Bushings

Brakes:

Hydraulic System, ABS, Brake Pad/Rotor Replacement, Bleeding Procedures

Steering:

Power Steering System, Steering Column, Tie Rods

Electrical System:

Wiring Diagrams, Component Location, Fuse/Relay Identification

Body And Interior:

Body Panel Removal, Interior Trim, Seat Removal, Glass Replacement

HVAC:

Climate Control System Diagnosis and Repair

Comfort Convenience:

Power Windows, Door Locks, Remote Keyless Entry

Procedures Included

Scheduled Maintenance:

Detailed Service Intervals and Procedures

Troubleshooting:

Diagnostic Flowcharts, Symptom-Based Diagnosis

Repair And Replacement:

Step-by-Step Repair Guides for All Major Components

Diagnostics:

OBD-II Diagnostics, DTC Code Explanations

Torque Specifications:

Precise Torque Values for Critical Fasteners

Special Tools:

Identification and Usage of Subaru Specific Tools

Technical Depth

Depth:

Comprehensive (from basic maintenance to full engine/transmission rebuilds)

Audience:

Primarily Professional Technicians, but accessible to advanced DIYers

📊 Manual Specifications

File Format

Format:

Searchable PDF

Searchability:

Full Text Search Capability

Print Quality

Printability:

High-Resolution, Printable Pages

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Code Na:

EJ253 (2.5L SOHC)

Engine Code Turbo:

EJ205 (2.0L DOHC Turbocharged - WRX)

Performance

Na Horsepower:

165 hp @ 5600 rpm (EJ253)

Na Torque:

166 lb-ft @ 4000 rpm (EJ253)

Turbo Horsepower:

227 hp @ 5600 rpm (EJ205 - WRX)

Turbo Torque:

242 lb-ft @ 3000 rpm (EJ205 - WRX)

Fuel System

Fuel Delivery:

Multi-Point Fuel Injection (MPFI)

Fuel Type:

Unleaded Gasoline (91 Octane Recommended for WRX)

Engine Details

Bore X Stroke Ej253:

99.5 mm x 79.0 mm

Bore X Stroke Ej205:

92.0 mm x 75.0 mm

Compression Ratio Ej253:

9.7:1

Compression Ratio Ej205:

8.0:1

🔧 Transmission

Standard

Transmission Type Na:

5-Speed Manual

Transmission Type Wrx:

5-Speed Manual

Optional

Transmission Type Na:

4-Speed Automatic

Features

AWD System:

Subaru Symmetrical All-Wheel Drive with Viscous Center Coupling

Automatic AWD System:

Active Torque Split AWD (ATSAWD) on Automatic Transmission Models

Fluid Specifications

Manual Transmission Fluid:

API GL-5, SAE 75W-90 (Subaru Extra-S or equivalent)

Automatic Transmission Fluid:

Dexron III/Mercon (Subaru ATF-HP recommended)

Rear Differential Fluid:

API GL-5, SAE 90 (or Subaru Extra-S)

📐 Dimensions

Exterior

Length:

Approx. 173.8 inches (Sedan), 175.7 inches (Wagon)

Width:

Approx. 68.1 inches

Height:

Approx. 56.1 inches (Sedan), 58.5 inches (Wagon)

Wheelbase:

Approx. 103.0 inches

Ground Clearance:

Approx. 6.1 inches (Standard), 7.1 inches (WRX)

Weights

Curb Weight:

Approx. 3000 - 3300 lbs (depending on trim/drivetrain)

Gross Vehicle Weight Rating:

Approx. 4200 - 4400 lbs

Cargo

Cargo Volume Sedan:

Approx. 11.7 cubic feet

Cargo Volume Wagon:

Approx. 29.6 cubic feet (rear seats up)

🛡️ Safety Features

Ratings

NHTSA Front Impact Driver:

Good (2003 Model Year)

NHTSA Front Impact Passenger:

Good (2003 Model Year)

IIHS Front Offset Driver:

Acceptable (2003 Model Year)

Active Features

Standard on most models, optional on some base trims.

Traction Control:

Available on certain models, particularly those with automatic transmissions.

Passive Features

Airbags Front:

Driver and Front Passenger Airbags

Airbags Side:

Optional Front Side Airbags on higher trims.

Seatbelts:

3-Point Height-Adjustable Front Seatbelts with Pretensioners

💡 Technology Features

Infotainment

Audio System:

Factory AM/FM/CD player, optional premium audio system (e.g., Clarion).

Display:

Basic LCD screen for clock and radio information. No integrated navigation.

Driver Assistance

Cruise Control:

Standard on most trims.

All Wheel Drive:

The cornerstone technology providing enhanced traction and stability.

Connectivity

Bluetooth:

Not factory-equipped. Aftermarket integration is common.

Not factory-equipped. Aftermarket integration is common.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 6 months (severe conditions) or 7,500 miles or 12 months (normal conditions).

Engine Air Filter:

Replace every 15,000-30,000 miles or as needed based on driving conditions.

Cabin Air Filter:

Replace every 15,000 miles or 12 months.

Spark Plugs:

Replace every 60,000-100,000 miles (depending on plug type, iridium recommended for longevity).

Timing Belt:

Replace every 90,000-105,000 miles or 7 years (critical maintenance item for interference engines).

Fluid Specifications

Engine Oil Capacity:

4.8 US quarts (4.5 Liters) with filter (EJ253), 4.8 US quarts (4.5 Liters) with filter (EJ205)

Engine Oil Type:

API SG or SH, ILSAC GF-2, SAE 5W-30 recommended. Consider 10W-30 for warmer climates. (Check owner's manual for specific recommendations).

Coolant Type:

Ethylene Glycol-based coolant, Subaru Super Coolant (blue) or equivalent.

Brake Fluid Type:

DOT 3 or DOT 4

Known Issues

Head Gaskets:

Subaru EJ engines of this era are known for potential head gasket leaks, particularly on naturally aspirated models. Early detection and repair are crucial.

Wrx Ring Land Failure:

High-performance WRX models can be susceptible to ring land failure under extreme stress or improper tuning.

Clutch Wear:

Manual transmission clutches can wear prematurely with aggressive driving.

Intercooler Spray Failure Wrx:

Water spray system for the intercooler on some WRX models can malfunction.

Oil Consumption:

Some EJ engines can exhibit increased oil consumption as they age.

📚 Vehicle History

Brand Heritage

Subaru Founding:

Founded in 1953 in Japan, known for its early focus on aircraft manufacturing and later its unique automotive technologies.

Model Evolution

First Generation Impreza:

Introduced in 1992 as a successor to the Leone.

Second Generation Impreza:

The 2003 model year marked the introduction of the second generation (GD/GG chassis).

Design Language Gc8 To Gdgg:

Transition from the rounded GC8 chassis to the more angular and 'bug-eyed' (initially) GD/GG chassis, which was later facelifted.

Production

Manufacturing Location:

Japan (Gunma Prefecture)

Production Years Gdgg:

2000-2007 (Globally, with facelifts in 2002 and 2005)

🏆 Awards & Recognition

Recognitions

Car And Driver 10Best:

The WRX variant was frequently recognized by automotive publications for its performance and value.

Rally Heritage:

Success in the World Rally Championship (WRC) contributed significantly to the Impreza's performance image.

Ratings

Consumer Reports Reliability:

Varied by year and model; head gasket issues impacted reliability scores for some years.