2004 Subaru Impreza Service Manual Instant Download 04 PDF

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🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2004 Codes Chassis Code: GDB (WRX/STI), GD (non-WRX) Generation Generation: Second Generation (GD/GG) 👋 Introduction Market Position Segment: Compact Sports Sedan/Wagon...

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza

Year:

Codes

Chassis Code:

GDB (WRX/STI), GD (non-WRX)

Generation

Generation:

Second Generation (GD/GG)

👋 Introduction

Market Position

Segment:

Compact Sports Sedan/Wagon

Target Audience:

Enthusiasts, DIY mechanics, Subaru owners seeking to perform their own maintenance and repairs.

Competitive Analysis

Competitors:

Mitsubishi Lancer Evolution, Honda Civic Si, Mazda3 MPS, Volkswagen Golf GTI

Key Features

All Wheel Drive:

Symmetrical All-Wheel Drive (standard on most trims)

Performance Variants:

Availability of high-performance WRX and STI models with turbocharged engines and enhanced chassis components.

Practicality:

Available in sedan and wagon body styles, offering practicality alongside performance.

📋 Manual Details

Coverage Areas

Primary Coverage:

All service and repair procedures for the 2004 Subaru Impreza

Secondary Coverage:

Routine maintenance, diagnostics, troubleshooting, component removal/installation, specifications, wiring diagrams, bodywork, interior/exterior components

Page Count

Estimated Page Count:

Varies based on specific engine/trim, but comprehensive manuals typically range from 1500-3000+ pages for this generation.

Manual Type

Type:

Repair Manual / Service Manual

Language

Language:

English

Format

Format:

Digital (PDF)

📖 Manual Coverage

Systems Covered

Powertrain:

Engine, Engine Lubrication, Cooling, Fuel System, Emissions Control, Ignition System, Intake and Exhaust Systems, Turbocharger (if applicable)

Drivetrain:

Manual Transmission, Automatic Transmission, Clutch System, Differential, Driveshaft, Axles, AWD System

Chassis:

Steering System, Suspension System (Front and Rear), Brakes (including ABS), Wheels and Tires

Electrical:

Body Electrical System, Powertrain Control Module (PCM), Engine Control, Lighting, Instrumentation, Audio System, Power Accessories, Supplemental Restraint System (SRS)

Body And Interior:

Body Panels, Doors, Windows, Seats, Interior Trim, HVAC System, Climate Control, Body Sealing

Procedures Included

Routine Maintenance:

Oil and filter changes, air filter replacement, cabin air filter replacement, spark plug replacement, fluid level checks and top-offs (coolant, brake fluid, power steering fluid, transmission fluid, differential fluid)

Tune Up And Engine Repair:

Valve adjustment, timing belt/chain inspection and replacement (depending on engine variant), cylinder head removal/installation, piston and ring service, crankshaft and bearing service, complete engine rebuilding

Transmission And Drivetrain Repair:

Clutch replacement, manual transmission internal repair, automatic transmission overhaul, differential service and repair, driveshaft and CV joint replacement

Suspension And Steering Repair:

Shock absorber and strut replacement, control arm service, ball joint replacement, tie rod end replacement, power steering pump and rack and pinion service

Brake System Service:

Brake pad and rotor replacement, brake caliper service, brake fluid bleeding, ABS system diagnostics and repair

Electrical Diagnostics:

Troubleshooting electrical faults using wiring diagrams, component testing (sensors, actuators, modules), SRS system diagnostics and repair

Body And Trim Repair:

Door panel removal, seat removal, bumper repair/replacement, interior trim panel replacement

Technical Depth

Depth:

Comprehensive, covering basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures and troubleshooting trees.

Illustrations:

Detailed step-by-step instructions with diagrams and photographic illustrations for clarity.

Special Tools:

Identification of required special tools for specific repair procedures.

Troubleshooting:

Inclusion of diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, and repair procedures for common issues.

📊 Manual Specifications

File Format

File Type:

Print Quality

Quality:

High-resolution, allowing for clear printing of specific pages.

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper Type:

N/A (Digital Download) - User can print on desired paper.

⚙️ Engine Specifications

Primary Engine

Engine Code Non Turbo:

EJ253 (2.5L SOHC Boxer), EJ20 (various versions, e.g., EJ205 for WRX)

Engine Code Turbocharged:

EJ205 (2.0L Turbocharged Boxer for WRX), EJ257 (2.5L Turbocharged Boxer for STI)

Performance 2 5I

Displacement 2 5I:

2.5 Liters (2457 cc)

Horsepower 2 5I:

Approx. 173 hp @ 5600 rpm

Torque 2 5I:

Approx. 166 lb-ft @ 4000 rpm

Performance Wrx

Displacement Wrx:

2.0 Liters (1994 cc)

Horsepower Wrx:

Approx. 227 hp @ 6000 rpm

Torque Wrx:

Approx. 217 lb-ft @ 4000 rpm

Performance Sti

Displacement Sti:

2.5 Liters (2457 cc)

Horsepower Sti:

Approx. 300 hp @ 6000 rpm

Torque Sti:

Approx. 300 lb-ft @ 4000 rpm

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Recommended Fuel:

Unleaded gasoline (87 octane for non-turbo, 91+ octane for WRX/STI)

🔧 Transmission

Standard

Standard Transmission:

5-Speed Manual Transmission

Optional

Optional Transmission:

4-Speed Automatic Transmission (typically for non-turbo models)

Features Manual

Clutch Type:

Hydraulic Clutch System

Features Awd

AWD System:

Symmetrical All-Wheel Drive with various torque split configurations depending on transmission and trim (e.g., viscous center differential, electronically controlled center differential for STI).

📐 Dimensions

Exterior Sedan

Length:

Approx. 4415 mm (173.8 in)

Width:

Approx. 1740 mm (68.5 in)

Height:

Approx. 1410 mm (55.5 in)

Exterior Wagon

Length:

Approx. 4465 mm (175.8 in)

Width:

Approx. 1740 mm (68.5 in)

Height:

Approx. 1445 mm (56.9 in)

Weights

Curb Weight:

Varies by trim and body style, typically ranging from 2900 to 3400 lbs.

Wheelbase:

2535 mm (99.8 in)

Track Width Front:

Approx. 1480 mm (58.3 in)

Track Width Rear:

Approx. 1475 mm (58.1 in)

Dimensions Sti

Ground Clearance Sti:

Approx. 135 mm (5.3 in) (Lowered for performance)

🛡️ Safety Features

Ratings

NHTSA Front Impact:

5-Star (for driver and passenger)

NHTSA Side Impact:

4-Star (for front and rear passengers)

Active Features

Anti-lock Braking System (ABS)

E Brake:

Electronic Brake-force Distribution (EBD) (often integrated with ABS)

Traction Control:

Available Traction Control System (TCS)

Passive Features

Airbags:

Driver and front passenger airbags, available side airbags

Supplemental Restraint System (SRS) including airbag system and pre-tensioner seatbelts

Rollover Protection:

Reinforced passenger compartment structure

💡 Technology Features

Infotainment

Audio System:

Standard AM/FM/CD player, optional premium audio systems with more speakers and CD changer.

Navigation:

Rarely offered, and if so, typically as an aftermarket dealer option.

Driver Assistance

Cruise Control:

Standard on most trims.

All Wheel Drive:

Symmetrical All-Wheel Drive is a core technological feature.

Connectivity

Auxiliary Input:

Typically not available on base models; aftermarket solutions are common.

🔧 Maintenance

Service Intervals Oil

Oil Change Interval:

Typically every 3,750 to 7,500 miles (6,000 to 12,000 km) or 6 months, whichever comes first, depending on driving conditions. Consult the manual for specific recommendations based on oil type used.

Service Intervals Filters

Air Filter Replacement:

Every 15,000 to 30,000 miles (24,000 to 48,000 km) or as needed based on inspection.

Cabin Filter Replacement:

Typically every 15,000 to 30,000 miles (24,000 to 48,000 km).

Service Intervals Spark Plugs

Spark Plug Replacement:

For standard EJ253: ~60,000 miles. For EJ205/EJ257: Varies, often with specialized spark plugs recommended.

Service Intervals Fluids

Coolant Replacement:

Initial change at 30,000 miles, then every 30,000 miles thereafter. (Subaru Super Coolant is often recommended).

Transmission Fluid Manual:

Check periodically, change typically around 60,000-100,000 miles (check manual for exact recommendation).

Transmission Fluid Automatic:

Check periodically, change typically around 30,000-60,000 miles depending on use. (Use Dexron III or equivalent).

Differential Fluid Front Rear:

Check periodically, change typically around 30,000-60,000 miles.

Fluid Specifications

Engine Oil Non Turbo:

SAE 5W-30 or 10W-30 (API SG, SH, or SJ classification). Consult manual for specific viscosity based on climate.

Engine Oil Turbocharged:

SAE 5W-30 or 5W-40 (API SJ, SL, or SM classification) - often a higher quality synthetic is recommended.

Coolant:

Subaru Super Coolant (Blue) or equivalent. 50/50 mix with distilled water.

Brake Fluid:

DOT 3 or DOT 4

Power Steering Fluid:

Subaru Genuine ATF or Dexron III/Mercon equivalent

Manual Transmission Fluid:

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

Automatic Transmission Fluid:

Dexron III or equivalent

Known Issues

Head Gaskets:

While less common on EJ253 (SOHC) engines compared to earlier EJ25D (DOHC), head gasket leaks can still occur. Subaru used multiple revisions of head gaskets.

Turbo Failure Wrx Sti:

Turbocharger failures can occur, especially with improper maintenance, oil starvation, or aggressive driving without adequate cool-down periods.

Clutch Wear:

Clutch wear is generally considered normal for performance applications, but premature wear can result from abuse or towing.

Suspension Components:

Worn suspension bushings, ball joints, and wheel bearings are common wear items, particularly on performance models driven hard.

Oil Consumption:

Some EJ engines, especially with higher mileage, may exhibit increased oil consumption.

📚 Vehicle History

Brand Heritage

Subaru Heritage:

Subaru, a division of Subaru Corporation (formerly Fuji Heavy Industries), is known for its boxer engines and standard All-Wheel Drive systems, particularly in its rally-bred performance vehicles.

Model Evolution

Second Gen Introduction:

The second generation (GD/GG) Impreza debuted for the 2002 model year, with the 2004 model representing a significant update with revised styling and performance enhancements, especially for the WRX and STI models.

Performance Heritage:

The Impreza WRX and STI have a strong heritage in motorsports, particularly in the World Rally Championship (WRC), where they achieved significant success and influenced the development of production models.

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Car And Driver 2004:

Car and Driver 10Best (often awarded to WRX/STI variants for their performance and value).

Performance Reviews:

Consistently praised for its handling, grip, and turbocharged performance by automotive media.