2004 SUBARU IMPREZA Service Manual- DIY Factory Service/Repair/PDF Shop Manual-04 IMPREZA-

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🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2004 Codes Chassis Code: GD/GG Platform: Subaru Global Platform (first generation) 👋 Introduction Market Position Segment: Compact/Small Family Car, Rally Sport...

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Mots clés: 2004 Car Cars IMPREZA Misc Subaru

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza

Year:

Codes

Chassis Code:

GD/GG

Platform:

Subaru Global Platform (first generation)

👋 Introduction

Market Position

Segment:

Compact/Small Family Car, Rally Sport Heritage

Competitive Analysis

Key Competitors:

Mitsubishi Lancer, Honda Civic, Toyota Corolla, Mazda3

Key Features

Drivetrain Advantage:

Standard Symmetrical All-Wheel Drive (AWD) across most trims

Performance Variants:

Availability of turbocharged WRX and STI models

Design Philosophy:

Practicality, safety, and performance, with rally-inspired DNA

📋 Manual Details

Coverage Areas

All Systems:

Body And Chassis:

Engine:

Transmission:

Drivetrain:

Suspension:

Steering:

Brakes:

Electrical System:

HVAC:

Fuel System:

Exhaust System:

Cooling System:

Ignition System:

Emissions Control:

Diagnostics:

Wiring Diagrams:

Troubleshooting:

Torque Specifications:

Special Tools:

Page Count

Estimated Pages:

~2000+

Manual Type

Type:

Factory Service Manual (FSM)

Purpose:

DIY Repair and Maintenance

Language

Language:

English

Format

Format:

Searchability:

Searchable Text

Printability:

Printable

📖 Manual Coverage

Systems Covered

Engine Management:

ECU, sensors, actuators, fuel injection, ignition timing

Powertrain Control:

Engine, transmission, AWD system integration

Chassis Systems:

Suspension, steering, brakes (including ABS), wheel bearings

Body Electrical:

Lighting, wipers, power accessories, central locking, alarm system

Interior Systems:

Climate control, airbags, seat belts, instrument cluster, audio systems

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, spark plug service, fluid checks/changes

Component Diagnostics:

Step-by-step troubleshooting for all major systems

Component Removal And Installation:

Detailed instructions for disassembling and reassembling all parts

Rebuilding Procedures:

Engine, transmission, and differential rebuilding guides

Alignment And Balancing:

Wheel alignment specifications and procedures

Air Conditioning Service:

Refrigerant handling, leak detection, component replacement

Diagnostic Trouble Codes:

Definition and troubleshooting steps for OBD-II codes

Technical Depth

Depth:

Comprehensive (from basic maintenance to full engine rebuilds)

Diagnostics Level:

Advanced electronic diagnostics, including sensor data analysis

Repair Complexity:

Suitable for both novice DIYers and experienced technicians

📊 Manual Specifications

File Format

Quality:

High resolution, clear text and images

Print Quality

Clarity:

Excellent, designed for clear printing

Binding Type

Binding:

N/A (Digital PDF)

Paper Type

Paper:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Code Na:

EJ251 (2.5L Naturally Aspirated)

Engine Displacement Na:

2.5 Liters (2457 cc)

Engine Configuration Na:

Horizontally Opposed (Boxer) 4-cylinder

Bore X Stroke Na:

99.5 mm x 79.0 mm

Compression Ratio Na:

9.7:1

Horsepower Na:

165 hp @ 5600 rpm (approx.)

Torque Na:

166 lb-ft @ 4000 rpm (approx.)

Performance Variant Wrx

Engine Code Wrx:

EJ255 (2.5L Turbocharged)

Horsepower Wrx:

227 hp @ 5600 rpm (approx.)

Torque Wrx:

235 lb-ft @ 3000 rpm (approx.)

Performance Variant Sti

Engine Code Sti:

EJ257 (2.5L Turbocharged - DOHC)

Horsepower Sti:

300 hp @ 6000 rpm (approx.)

Torque Sti:

300 lb-ft @ 4000 rpm (approx.)

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Recommended Fuel:

87 Octane (NA), 91+ Octane (Turbocharged WRX/STI)

Cooling System

Coolant Type:

Subaru Super Coolant (Blue) or equivalent

🔧 Transmission

Standard

Transmission Na:

5-Speed Manual

Optional Na

Transmission Na:

4-Speed Automatic (with AWD)

Standard Wrx

Transmission Wrx:

5-Speed Manual

Standard Sti

Transmission Sti:

6-Speed Manual

Features

AWD System:

Symmetrical All-Wheel Drive with Front Helical LSD, Rear Viscous LSD (except STI)

Sti AWD Features:

Driver Controlled Center Differential (DCCD)

📐 Dimensions

Exterior

Length:

173.4 - 174.6 inches (depending on model)

Width:

68.1 inches

Height:

56.1 inches (Sedan) / 55.1 inches (Wagon)

Wheelbase:

100.4 inches

Ground Clearance:

5.7 - 6.1 inches (depending on model)

Weights

Curb Weight Na:

~2900 - 3100 lbs (depending on body style/transmission)

Curb Weight Wrx:

~3100 - 3200 lbs

Curb Weight Sti:

~3200 - 3300 lbs

Towing Capacity:

Not Recommended/Specified

Cargo

Trunk Volume Sedan:

~11.4 cu ft

Cargo Volume Wagon:

~29.8 cu ft (behind rear seats)

🛡️ Safety Features

Ratings

NHTSA Front Driver:

Good (2004 Model Year)

NHTSA Front Passenger:

Good (2004 Model Year)

NHTSA Side Driver:

Good (2004 Model Year - with side airbags)

NHTSA Side Rear Passenger:

Good (2004 Model Year - with side airbags)

IIHS Front Impact:

IIHS Side Impact:

Acceptable (without side airbags) / Good (with side airbags)

Active Features

Standard on all trims

Traction Control:

Available on some trims

Electronic Stability Control:

Not widely available on this generation

Passive Features

Airbags Front:

Standard Dual Front SRS Airbags

Airbags Side:

Optional Front Side-Impact Airbags

Seatbelts:

3-point front and rear seatbelts with pretensioners

Child Seat Anchors:

LATCH system

💡 Technology Features

Infotainment

Audio System:

Factory AM/FM/CD player with optional CD changer. Basic speaker setup.

Navigation:

Not available on most trims. Aftermarket solutions were common.

Driver Assistance

Cruise Control:

Standard on most trims

Keyless Entry:

Available on higher trims

Connectivity

Auxiliary Input:

Typically not standard. Requires aftermarket modification.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 3 months (severe conditions) / 7,500 miles or 6 months (normal conditions), check manual for specifics.

Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement:

Every 60,000 miles (Iridium plugs)

Timing Belt Replacement:

105,000 miles or 105 months (critical for EJ engines)

Fluid Specifications

Engine Oil:

SAE 5W-30 (API SJ or higher, ILSAC GF-3)

Transmission Fluid Manual:

SAE 75W-90 GL-5 Gear Oil

Transmission Fluid Automatic:

Subaru ATF-HP or Dexron III compatible

Differential Fluid Front:

SAE 75W-90 GL-5 Gear Oil

Differential Fluid Rear:

SAE 75W-90 GL-5 Gear Oil

Brake Fluid:

DOT 3 or DOT 4

Known Issues

Head Gaskets:

Common on EJ25 engines, particularly earlier models. Manual provides repair procedures.

Clutch Wear:

Can be accelerated with aggressive driving, especially on WRX/STI models.

Turbo Failure:

Potential on WRX/STI if maintenance intervals are neglected or oil starvation occurs.

Rust:

Can affect wheel wells, rocker panels, and rear quarter panels in rust-belt regions.

📚 Vehicle History

Brand Heritage

Subaru Focus:

All-Wheel Drive and Boxer engines since its inception

Rally Dominance:

Strong association with World Rally Championship (WRC) success

Model Evolution

Generation Introduction:

Second Generation (2002-2007)

Design Change:

Significant styling update from the first generation, moving away from classic rally car proportions.

Engine Development:

Introduction of the EJ255 and EJ257 turbocharged engines for WRX/STI models.

Production

Manufacturing Plant:

Gunma Manufacturing Plant, Japan

Production Years:

2002-2007

🏆 Awards & Recognition

Recognitions

IIHS Top Safety Picks:

Many Subaru models, including Impreza, have received good safety ratings from IIHS.

Wrx Sti Reputation:

Highly regarded for performance and rally heritage by automotive enthusiasts.