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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 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),...
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2004 Subaru Impreza Service Manual Instant Download 04 PDF2004 Subaru Impreza Service Manual Instant Download 04 PDF2004 Subaru Impreza Service Manual Instant Download 04 PDF2004 Subaru Impreza Service Manual Instant Download 04 PDF
🏷️ 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
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:
PDF
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
ABS:
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
Srs:
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.
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