Subaru Impreza WRX STI 2015 Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: GV Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Niche: Rally-inspired, all-wheel-drive...

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Sku: 463453

Tags: 2015 Car Cars Impreza WRX STI Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

Engine Code:

EJ257

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback

Niche:

Rally-inspired, all-wheel-drive performance car with a strong enthusiast following.

Competitive Analysis

Key Competitors:

Mitsubishi Lancer Evolution (previous generation), Ford Focus RS (later generation), Volkswagen Golf R, Audi S3.

Key Features

Differentiators:

Iconic EJ257 engine, Symmetrical All-Wheel Drive system with Driver Controlled Centre Differential (DCCD), hydraulic power steering, Brembo brakes, robust chassis, legendary rally heritage.

Target Audience

Primary Users:

Professional automotive technicians, experienced DIY mechanics, Subaru enthusiasts seeking in-depth repair and maintenance knowledge.

📋 Manual Details

Coverage Areas

Covered Regions:

Global (primarily North America, Europe, Japan)

Page Count

Estimated Pages:

2500+

Manual Type

Type:

Factory Service Manual (FSM) / Repair Manual

Language

Language:

English

Format

Format:

📖 Manual Coverage

Systems Covered

Powertrain:

Engine (EJ257), turbocharged intercooled, DOHC, 16-valve Boxer; Drivetrain (Symmetrical All-Wheel Drive, DCCD, differentials); Transmission (6-speed manual); Fuel System; Exhaust System.

Chassis:

Suspension (front MacPherson struts, rear double wishbone, STI-specific tuning); Steering (power rack and pinion); Brakes (Brembo front and rear calipers, vented discs); Wheels and Tires; Frame and Body Structure.

Electrical:

Engine Control Module (ECM), Powertrain Control Module (PCM); Lighting System; Instrument Cluster; Audio System; HVAC Controls; Power Accessories; Security System; SRS (Airbag) System; CAN Bus Architecture.

Body:

Exterior Panels; Interior Trim; Doors; Windows; Seats; Roof; Bumpers; Aerodynamics.

Procedures Included

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, brake pad inspection.

Troubleshooting:

Diagnostic Trouble Codes (DTCs), symptom-based troubleshooting, electrical circuit diagnosis, performance issues.

Repair:

Engine component removal and installation (pistons, rods, crankshaft, valves, turbocharger); transmission overhaul; brake caliper replacement; suspension component renewal; electrical component repair and replacement.

Diagnostics:

OBD-II diagnostics, sensor testing, actuator testing, ECU diagnosis, live data analysis.

Technical Depth

Depth:

Comprehensive diagnostic procedures, detailed exploded views, torque specifications, wiring diagrams, specific tool requirements, step-by-step repair instructions, overhaul procedures for major components.

📊 Manual Specifications

File Format

Quality:

High-resolution, searchable PDF with clear diagrams and text.

Print Quality

Printability:

Printable pages, allowing for physical reference.

Binding Type

Binding:

N/A (Digital PDF)

Paper Type

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

EJ257 Boxer H4

Aspiration:

Twin-Scroll Turbocharged with Intercooler

Displacement:

2.5 Liters (2457 cc)

Bore X Stroke:

99.5 mm x 80.0 mm

Compression Ratio:

8.2:1

Performance

Horsepower:

305 HP @ 6000 RPM

Torque:

290 lb-ft (393 Nm) @ 4000 RPM

Fuel System

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

Injection Type:

Multi-Point Fuel Injection (MPI) with Sequential Electronic Control

Engine Management

ECU Model:

Denso ECU (specific part numbers vary)

Lubrication

Oil Capacity Quarts:

5.5 US Quarts (5.2 Liters) with filter change

Oil Specification:

SAE 5W-30 (API SN, ILSAC GF-5 or equivalent)

🔧 Transmission

Standard

Type:

6-Speed Manual Transmission

Optional

Type:

N/A (STI exclusively manual for this generation)

Features

Dccd:

Driver Controlled Centre Differential (DCCD) for adjustable torque split.

Fluid Capacity Quarts

Transmission Oil:

2.3 US Quarts (2.2 Liters)

Fluid Specifications

Transmission Oil Type:

Subaru ExtraS II or equivalent (75W-90 GL-5 manual transmission fluid)

Front Differential

Fluid Capacity Quarts:

0.5 US Quarts (0.5 Liters)

Fluid Type:

75W-90 GL-5 gear oil

Rear Differential

Fluid Capacity Quarts:

0.6 US Quarts (0.6 Liters)

Fluid Type:

75W-90 GL-5 gear oil

📐 Dimensions

Exterior

Length:

173.8 inches (4415 mm)

Width:

70.7 inches (1795 mm)

Height:

58.1 inches (1475 mm)

Wheelbase:

103.0 inches (2616 mm)

Front Track:

60.6 inches (1539 mm)

Rear Track:

60.4 inches (1534 mm)

Weights

Curb Weight:

3373 lbs (1530 kg)

Gross Weight Rating:

4629 lbs (2100 kg)

Towing Capacity:

N/A (Not Recommended)

Cargo

Trunk Volume Cubic Feet:

11.7 cu ft (Sedan)

Wheels Tires

Standard Wheel Size:

18 x 8.5 inches

Optional Wheel Size:

19 x 8.5 inches (STI Limited)

Standard Tire Size:

245/40R18

Wheel Bolt Pattern:

5x114.3 mm (5x4.5 inches)

🛡️ Safety Features

Ratings

NHTSA Overall Rating:

4 Stars (2015 Model Year)

IIHS Top Safety Pick:

Good (for 2015 model year variants tested)

Active Features

Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD)

Traction Control:

Vehicle Stability Control (VSC) and Traction Control System (TCS).

Symmetrical All-Wheel Drive system with DCCD.

Passive Features

Airbags:

Driver and front passenger airbags, front side-impact airbags, side curtain airbags.

Seatbelts:

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

Child Anchors:

LATCH (Lower Anchors and Tethers for Children) system.

💡 Technology Features

Infotainment

Display Size:

6.1-inch touchscreen (standard) or 7-inch touchscreen (optional on Limited trims).

Audio System:

Subaru Starlink infotainment system, CD player, MP3 playback, AM/FM/SiriusXM satellite radio, Bluetooth audio streaming and hands-free calling.

Navigation:

Optional GPS navigation system.

Driver Assistance

Rearview Camera:

Standard on all trims.

Eyesight System:

Not available on WRX STI models for 2015 (standard on other Impreza trims).

Connectivity

Usb Ports:

Yes (typically one or two).

Aux Input:

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 6,000 miles or 6 months, whichever comes first (severe driving conditions may require more frequent changes).

Engine Air Filter:

Inspect every 15,000 miles, replace as needed.

Cabin Air Filter:

Inspect every 15,000 miles, replace as needed.

Spark Plugs:

Replace every 60,000 miles (Iridium type).

Brake Fluid:

Replace every 30,000 miles or 36 months.

Transmission Fluid:

Replace every 30,000 miles or 36 months (manual transmission, front and rear differentials).

Fluid Specifications

Coolant:

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

Brake Fluid Type:

DOT 3 or DOT 4 (low viscosity, high temperature).

Known Issues

Engine Ringlands:

Potential for ringland failure in EJ257 engine under extreme stress/improper tuning. Manual covers diagnosis and repair procedures.

Clutch Wear:

Performance driving can lead to accelerated clutch wear. Manual details clutch inspection and replacement.

Hatch Rattles:

Common in hatchback models, often related to interior trim or hatch seals. Manual addresses body panel adjustments and seal maintenance.

Turbo Lag:

Characteristic of the EJ257, but manual provides diagnostic steps for abnormal turbo behavior or performance degradation.

📚 Vehicle History

Brand Heritage

Rally Legacy:

Subaru's long and successful history in the World Rally Championship (WRC) with multiple driver and manufacturer titles, directly influencing the WRX STI's development.

Model Evolution

Generation:

This model is part of the fourth generation Subaru Impreza (GJ/GP/GV/GR), with the WRX STI being the performance variant.

Performance Focus:

The WRX STI line has always prioritized performance, handling, and driver engagement, differentiating it from the standard Impreza models.

Production

Manufacturing Location:

Ota City, Gunma Prefecture, Japan.

Production Years

Specific Model Year:

🏆 Awards & Recognition

Recognitions

Motor Trend Award:

Subaru WRX and WRX STI were often contenders for performance car awards in their respective years, though specific wins vary.

Consumer Reports Ratings:

Subject to ongoing reviews, typically rated well for performance but sometimes lower for predicted reliability compared to mainstream vehicles.

Ratings

Enthusiast Following:

Consistently ranks high among automotive enthusiasts for its driving dynamics and performance capabilities.