Subaru Impreza WRX STI 2015 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: VA Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Usp: All-wheel-drive performance,...

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Stichworte: 2015 Car Cars Impreza WRX STI Misc Subaru

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🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

Engine Code:

EJ257

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback

All-wheel-drive performance, rally-bred heritage, turbocharged Boxer engine.

Competitive Analysis

Competitors:

Mitsubishi Lancer Evolution (discontinued for this generation), Volkswagen Golf GTI, Ford Focus RS (later generation).

Key Features

Powertrain:

EJ257 2.5L turbocharged Boxer engine, Symmetrical All-Wheel Drive, Driver Controlled Centre Differential (DCCD).

Performance Enhancements:

Large intercooler, performance exhaust, upgraded suspension components, Brembo brakes.

📋 Manual Details

Coverage Areas

All Models:

All Engines:

Yes (specifically EJ257)

All Trims:

Page Count

Estimated Pages:

2500+

Manual Type

Type:

Workshop Repair Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Detailed diagnostics, overhaul, timing belt, cooling system, lubrication, fuel injection, turbocharger system, ECU mapping.

Transmission:

6-speed manual (TY85) gearbox, clutch system, drivetrain components, AWD system (DCCD).

Brakes:

ABS, EBD, Brembo brake system (front and rear calipers, rotors, fluid), parking brake.

Suspension:

Front struts, rear shocks, coil springs, anti-roll bars, bushings, alignment specifications.

Steering:

Power steering system, steering rack, column, alignment.

Electrical:

Wiring diagrams, starter, alternator, battery, lighting, fuses, relays, ECUs, sensors, immobilizer.

Bodywork:

Exterior panels, interior trim, doors, windows, sunroof, structural components, corrosion protection.

Climate Control:

HVAC system, refrigerant, AC compressor, heater core, blower motor.

Safety Systems:

Airbag system, seatbelts, SRS module, occupant sensors.

Procedures Included

Maintenance:

Scheduled maintenance intervals, oil changes, filter replacements, fluid checks and top-offs.

Troubleshooting:

Diagnostic flowcharts, fault code interpretation, symptom-based troubleshooting.

Repair:

Component removal and installation, overhaul procedures, specific repair techniques.

Diagnostics:

OBD-II diagnosis, sensor testing, ECU communication testing.

Recalibration:

Throttle body relearn, ECU reset procedures, ABS sensor calibration.

Technical Depth

Depth:

Comprehensive: from basic fluid checks to full engine and transmission rebuilds.

Detail Level:

Highly detailed with torque specifications, clearances, and diagnostic parameters.

📊 Manual Specifications

File Format

Searchable Text:

Printable:

Resolution:

High-resolution (suitable for printing).

Print Quality

Quality:

N/A (Digital PDF)

Binding Type

Type:

N/A (Digital PDF)

Paper Type

Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Horizontally opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve, 4-cylinder

Displacement:

2457 cc (2.5 Liters)

Bore X Stroke:

99.5 mm x 80.0 mm

Compression Ratio:

8.4:1

Performance

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Fuel System

Fuel Delivery:

Sequential multi-point fuel injection with Electronic Throttle Control

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Turbocharger

Type:

Twin-scroll turbocharger

Cooling System

Coolant Capacity:

Approx. 8.1 US quarts (7.7 liters)

Coolant Type:

Subaru Super Coolant (Blue)

Lubrication

Oil Capacity:

Approx. 5.7 US quarts (5.4 liters) with filter

Oil Type:

SAE 0W-20 Synthetic (API SN or higher)

🔧 Transmission

Standard

Type:

6-speed Manual (TY85)

Optional

Type:

None (STI models exclusively manual)

Features

Dccd:

Driver Controlled Centre Differential (manual and auto modes).

AWD System:

Symmetrical All-Wheel Drive with front helical LSD and rear Torsen LSD.

Fluid Specifications

Manual Transmission Fluid Type:

Subaru Extra Gear Oil (API GL-5, SAE 75W-90)

Differential Fluid Front Type:

Subaru Extra Gear Oil (API GL-5, SAE 75W-90)

Fluid Capacities

Manual Transmission Capacity:

Approx. 3.3 US quarts (3.1 liters)

📐 Dimensions

Exterior

Length:

179.1 inches (4550 mm)

Width:

70.7 inches (1795 mm)

Height:

57.9 inches (1470 mm)

Wheelbase:

104.1 inches (2645 mm)

Weights

Curb Weight:

Approx. 3417 lbs (1550 kg)

Gross Vehicle Weight Rating:

Approx. 4560 lbs (2068 kg)

Cargo

Trunk Volume Sedan:

12.0 cu ft (340 L)

Trunk Volume Hatchback:

21.7 cu ft (615 L) behind rear seats

🛡️ Safety Features

Ratings

NHTSA Overall:

5-Star (for applicable models/configurations)

IIHS Top Safety Pick:

Yes (for applicable models/configurations)

Active Features

Traction Control:

Vehicle Dynamics Control (VDC) with yaw rate, lateral acceleration, and steering angle sensors.

Braking Assist:

Yes (integrated with ABS)

Passive Features

Airbags:

Front dual-stage airbags, front side-impact airbags, curtain airbags, driver's knee airbag.

Seatbelts:

3-point front and rear seatbelts with pretensioners and load limiters.

💡 Technology Features

Infotainment

System:

Subaru Starlink infotainment system with touchscreen, AM/FM/CD, HD Radio, SiriusXM Satellite Radio, Bluetooth connectivity.

Navigation:

Optional navigation system.

Driver Assistance

Features:

Rearview camera, optional EyeSight driver assistance system (on non-STI models, but relevant for the Impreza platform). STI focuses more on driver engagement.

Connectivity

Bluetooth:

Standard for audio streaming and hands-free calling.

Performance Tech

Dccd:

Driver Controlled Centre Differential offers adjustable torque split for various driving conditions and styles.

Si Drive:

Subaru Intelligent Drive allows selection of 'Sport', 'Sport Sharp', and 'Intelligent' modes for engine response, steering, and AWD system.

🔧 Maintenance

Service Intervals

Oil Change:

Every 3,750 miles or 6 months (severe driving conditions), 7,500 miles or 12 months (normal driving conditions) - refer to manual for specific details.

Air Filter Replacement:

Every 15,000 miles or 12 months (severe driving conditions).

Cabin Air Filter Replacement:

Every 15,000 miles or 12 months.

Spark Plug Replacement:

Every 60,000 miles (NGK iridium recommended).

Timing Belt Replacement:

Refer to manual for specific interval, but typically around 105,000 miles. Crucial for EJ257 engine.

Fluid Specifications

Brake Fluid Type:

DOT 3 or DOT 4 (Subaru genuine recommended)

Power Steering Fluid Type:

Subaru ATF-HP (Type H)

Known Issues

Engine:

Ring land failure (especially with aggressive tuning/abuse), head gasket issues (less common than older EJ engines, but still possible), oil consumption.

Clutch:

Wear on the clutch and flywheel, especially with aggressive driving.

Suspension:

Premature wear of certain bushings and sway bar end links.

📚 Vehicle History

Brand Heritage

Motorsport:

Extensive rally heritage (WRC championships) that directly influences WRX STI development.

Model Evolution

Generation Va:

This generation marked a significant shift with the introduction of electric power steering and a revised chassis.

Engine Development:

Continued use of the robust EJ257 engine, albeit with revisions for emissions and performance.

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Performance Car:

Consistently recognized by automotive journalists for its performance, handling, and AWD capabilities.

Rally Heritage Award:

Recognized for its lineage and direct connection to Subaru's successful rally history.

Ratings

Track Day Worthiness:

Highly regarded by enthusiasts for its track day performance and modifiability.