Subaru Impreza 2004 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2004 Product Type: Workshop Repair Service Manual Product Format: PDF Download Codes Chassis Codes: GD, GG (Sedan/Wagon) Engine Codes: EJ201, EJ202,...

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Type: Car

Vendor:

Sku: 373322

Tags: 2004 Car Cars Impreza Misc Subaru

Product variants

Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza

Year:

Product Type:

Workshop Repair Service Manual

Product Format:

PDF Download

Codes

Chassis Codes:

GD, GG (Sedan/Wagon)

Engine Codes:

EJ201, EJ202, EJ251, EJ253, EJ205 (WRX), EJ207 (WRX STI - JDM)

👋 Introduction

Market Position

Segment:

Compact Car / Affordable Performance Sedan/Wagon

Competitors:

Honda Civic, Toyota Corolla, Mazda3, Mitsubishi Lancer

Competitive Analysis

Differentiators:

Standard Symmetrical All-Wheel Drive, rally-inspired WRX/STI variants, boxer engine layout

Key Features

Powertrain Highlight:

Horizontally opposed ('boxer') engine and Symmetrical All-Wheel Drive

Performance Variants:

WRX and WRX STI models offered with turbocharged engines and enhanced performance features

Body Styles:

Available as a 4-door sedan and a 5-door wagon

📋 Manual Details

Coverage Areas

Covered Models:

All Impreza Models (Sedan & Wagon)

Covered Trims:

All Trim Levels (e.g., RS, TS, Outback Sport, WRX, WRX STI)

Covered Transmissions:

Manual and Automatic Transmissions

Page Count

Estimated Pages:

Extensive (typically 2000+ pages for comprehensive workshop manuals)

Manual Type

Type:

Workshop Repair Service Manual

Language

Language:

English

Format

Digital Format:

PDF (Searchable)

📖 Manual Coverage

Systems Covered

Powertrain:

Engine mechanical, fuel system, ignition system, cooling system, lubrication system, exhaust system, engine management (ECU/ECM)

Transmission Drivetrain:

Manual transmission, automatic transmission, clutch, differential, axles, driveshafts, AWD system (Symmetrical All-Wheel Drive)

Chassis Suspension:

Front suspension, rear suspension, steering system, wheels, tires

Brakes:

Front brakes, rear brakes, parking brake, ABS (Anti-lock Braking System)

Electrical:

Battery, charging system, starting system, lighting system, instrumentation, body electrical, power accessories, wiring diagrams

HVAC:

Heating, Ventilation, and Air Conditioning system

Body Exterior:

Body panels, doors, hood, trunk, bumpers, glass, exterior trim

Body Interior:

Seats, dashboard, interior trim, airbags, seatbelts

Procedures Included

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks, tune-ups

Repair:

Engine overhaul, transmission repair, brake service, suspension repair, electrical diagnostics and repair, bodywork repair

Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides

Specifications:

Torque specifications, clearances, fluid capacities, component dimensions

Diagnostics:

OBD-II diagnostics, sensor testing, actuator testing

Technical Depth

Depth:

Comprehensive (from basic maintenance to complete engine and transmission rebuilds)

Target Audience:

Professional Technicians and Enthusiast DIY Mechanics

📊 Manual Specifications

File Format

PDF Quality:

High-resolution, searchable text, bookmarked chapters

Printability:

Printable pages

Binding Type

Digital Binding:

N/A (Digital PDF)

Paper Type

Digital Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Naturally Aspirated:

2.5L EJ253 (SOHC, 167 hp @ 5600 rpm, 166 lb-ft @ 4000 rpm) and 2.0L EJ201/EJ202 (SOHC/DOHC, 142-147 hp, 135-140 lb-ft)

Turbocharged:

2.0L EJ205 (WRX - DOHC, 227 hp @ 5600 rpm, 217 lb-ft @ 3200 rpm) and 2.0L EJ207 (WRX STI - DOHC, 261-276 hp, 250-253 lb-ft depending on market/spec)

Performance

Compression Ratio Na:

9.7:1 (EJ253), 9.2:1 (EJ201/202)

Compression Ratio Turbo:

8.5:1 (EJ205), 8.0:1 (EJ207)

Fuel System

Injection Type:

Multi-point Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline (91 octane recommended for WRX/STI)

Engine Layout

Layout:

Horizontally opposed (Boxer)

Cylinders:

Engine Management

ECU Type:

Subaru Engine Control Unit (ECU/ECM)

🔧 Transmission

Standard

Manual Transmission:

5-speed manual (all-wheel drive)

Optional

Automatic Transmission:

4-speed automatic (all-wheel drive)

Features

AWD System:

Symmetrical All-Wheel Drive (with viscous coupling center differential)

Sti Transmission:

6-speed manual transmission (WRX STI)

Differential Type:

Front: Open; Rear: Limited Slip Differential (LSD) (standard on WRX/STI, optional on some NA models)

📐 Dimensions

Exterior

Wheelbase Sedan:

2535 mm (99.8 in)

Wheelbase Wagon:

2525 mm (99.4 in)

Length Sedan:

4415 mm (173.8 in)

Length Wagon:

4410 mm (173.6 in)

Width:

1695 mm (66.7 in)

Height:

1425 mm (56.1 in) sedan / 1450 mm (57.1 in) wagon

Weights

Curb Weight:

Approx. 1300-1450 kg (2866-3197 lbs) depending on model/trim

🛡️ Safety Features

Ratings

NHTSA Front Impact:

4 Stars (Driver & Passenger)

IIHS Front Offset:

Good (for models equipped with side airbags)

Active Features

Standard Anti-lock Braking System

Traction Control:

Available (e.g., Subaru Vehicle Dynamics Control - VDC)

Passive Features

Airbags:

Frontal airbags, optional front side-impact airbags

Seatbelts:

3-point seatbelts with pretensioners

💡 Technology Features

Infotainment

Head Unit:

Factory AM/FM/CD player, optional premium audio systems.

Speaker System:

Typically 4 or 6 speakers, Bose premium optional on some trims.

Driver Assistance

Cruise Control:

Standard on most models

Standard Anti-lock Braking System

Connectivity

Auxiliary Input:

Not standard, aftermarket solutions available

Usb Port:

Not available from factory

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty)

Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement Na:

Every 60,000 miles (standard copper)

Spark Plug Replacement Turbo:

Every 30,000 miles (platinum or iridium recommended for performance)

Fluid Specifications

Engine Oil:

SAE 5W-30 (API SG or higher, ILSAC GF-2 or higher). Consult manual for specific temperature ranges and synthetic recommendations.

Coolant:

Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant (50/50 mix with distilled water)

Transmission Fluid Manual:

SAE 75W-90 GL-5 gear oil

Transmission Fluid Automatic:

Subaru ATF HP or Dexron III compatible

Brake Fluid:

DOT 3 or DOT 4

Known Issues

Head Gaskets:

While less common than on earlier EJ engines, early failure can occur. The manual details inspection and replacement procedures.

Oil Consumption:

Some EJ engines can consume oil, especially at higher mileage. Manual provides checks.

Wrx Clutch:

Performance clutches in WRX models can wear faster under aggressive driving. Manual covers clutch replacement.

📚 Vehicle History

Brand Heritage

Parent Company:

Subaru Corporation (formerly Fuji Heavy Industries)

Brand Focus:

AWD technology, boxer engines, aviation background

Model Evolution

Generation:

Second Generation (GDA/GDB chassis)

Previous Generation:

First Generation (GC8/GF8 chassis, 1993-2001)

Facelift:

Minor facelift for 2004 model year (e.g., revised front bumper, headlights on some models)

Production

Production Years Generation:

2000-2007

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Car And Driver నించ:

Car and Driver 10 Best (WRX models frequently recognized for performance)

Jd Power Ratings:

JD Power and Associates initial quality study ratings varied by year and model, generally competitive within segment.

Certifications

Emissions Compliance:

Meets EPA and California emissions standards for its model year.