Subaru impreza STI 2012 factory Shop Service Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Codes Chassis Code: GV Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Usp: Iconic rally...

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Mots clés: 2012 Car Cars Impreza 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

Iconic rally heritage, turbocharged performance, symmetrical AWD

Competitive Analysis

Competitors 2012:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS

Key Features

Performance Focus:

Engineered for driving dynamics and motorsport-inspired performance

AWD System:

Advanced Driver Controlled Center Differential (DCCD) for variable torque distribution

Suspension Tuning:

Performance-tuned suspension for superior handling and grip

Braking System:

Upgraded Brembo braking system for enhanced stopping power

📋 Manual Details

Coverage Areas

Primary Coverage:

Full Factory Service and Workshop Repair

Diagnostic Coverage:

Extensive diagnostic procedures and troubleshooting guides

Repair Coverage:

Component-level repair procedures for all major systems

Maintenance Coverage:

Scheduled maintenance, fluid changes, filter replacements

Electrical Coverage:

Detailed wiring diagrams, electrical component testing

Body Coverage:

Body repair, panel replacement, alignment specifications

Suspension Steering Coverage:

Suspension component replacement, alignment procedures, steering system repair

Braking Coverage:

Brake system overhaul, ABS diagnosis, caliper and rotor replacement

Heating Cooling Coverage:

HVAC system diagnosis, refrigerant handling, component replacement

Page Count

Estimated Pages:

2000+

Manual Type

Type:

Factory Service Manual / Workshop Manual

Language

Language:

English

Format

Format:

Digital Download (PDF)

Accessibility:

Instant Download

📖 Manual Coverage

Systems Covered

Powertrain:

Engine, Turbocharger, Intercooler, Exhaust System

Drivetrain:

Symmetrical All-Wheel Drive (AWD) system, differentials (front, center, rear), driveshafts, CV joints

Transmission:

6-Speed Manual Transmission (TY856), clutch system, gearbox overhaul

Suspension:

Front MacPherson struts, rear double wishbone, springs, dampers, bushings, alignment specifications

Steering:

Hydraulic power steering system, steering rack, tie rods

Brakes:

Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, vented rotors, ABS, EBD, brake fluid specifications

Electrical System:

ECU, sensors, ignition system, lighting, battery, charging system, starter motor, infotainment wiring

Climate Control:

Air conditioning, heater, ventilation, cabin filter replacement

Fuel System:

Fuel pump, fuel injectors, fuel filter, fuel pressure regulator

Cooling System:

Radiator, water pump, thermostat, coolant specifications, fan control

Body And Trim:

Exterior panels, interior trim, seats, doors, windows, locks, glass replacement

Safety Systems:

Airbag system, seatbelt mechanisms, SRS component testing

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, brake pad inspection/replacement

Engine Overhaul:

Engine disassembly, inspection, reassembly, torque specifications, timing belt/chain procedures

Transmission Rebuild:

Gearbox disassembly, clutch replacement, synchro ring replacement, gear inspection

Brake System Repair:

Caliper rebuild, rotor replacement, master cylinder replacement, bleeding procedures

Suspension Alignment:

Front and rear wheel alignment procedures and specifications

Electrical Troubleshooting:

Diagnostic flowcharts, component testing, wiring harness repair

Turbocharger Service:

Turbocharger inspection, replacement, oil and coolant line maintenance

Diagnostics:

OBD-II trouble codes, diagnostic data interpretation, sensor testing

Recalibration Procedures:

Throttle body calibration, steering angle sensor calibration (where applicable)

Technical Depth

Depth:

Comprehensive factory-level repair and diagnostic information

Detail Level:

Step-by-step instructions with torque specifications and diagrams

Diagnostics Level:

Advanced diagnostic procedures for complex issues

Rebuild Scope:

Full engine and transmission rebuilds supported

📊 Manual Specifications

File Format

Format:

Searchability:

Searchable text for quick information retrieval

Resolution:

High-resolution scans for clear diagrams and text

Print Quality

Printability:

Printable pages for workshop use

Binding Type

Binding:

N/A (Digital)

Paper Type

Paper Type:

N/A (Digital)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Horizontally Opposed (Boxer), Turbocharged, Intercooled

Engine Code:

EJ257

Displacement:

2.5 Liters (2457 cc)

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Performance

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Fuel System

Fuel Delivery:

Sequential Electronic Fuel Injection (SEFI)

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

Engine Management

Subaru Engine Control Unit (ECU) with advanced mapping

Turbocharging

Turbocharger Model:

IHI VF48

Intercooler Type:

Top-mount intercooler

🔧 Transmission

Standard

Transmission Type:

6-Speed Manual (TY856)

Optional

Optional Transmission:

N/A (STI exclusively manual)

Features

Dccd:

Driver Controlled Center Differential (DCCD) with automatic and manual modes

Differentials:

Helical limited-slip front differential, viscous coupling center differential, Torsen limited-slip rear differential

Fluid Specifications

Manual Transmission Fluid:

Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent

📐 Dimensions

Exterior

Length:

173.8 inches (4415 mm)

Width:

70.1 inches (1780 mm)

Height:

57.4 inches (1458 mm)

Wheelbase:

103.0 inches (2616 mm)

Ground Clearance:

5.1 inches (130 mm)

Weights

Curb Weight:

Approx. 3,373 lbs (1530 kg)

Gross Vehicle Weight Rating:

Approx. 4,300 lbs (1950 kg)

Cargo

Cargo Volume Sedan:

11.3 cu ft (0.32 m³)

Wheels Tires

Wheel Size:

18 x 8.5 inch alloy wheels

Tire Size:

245/40R18

Bolt Pattern:

5 x 114.3 mm

🛡️ Safety Features

Ratings

NHTSA Overall:

4/5 Stars (for 2012 Impreza range, STI specific may vary slightly)

IIHS Status:

Good (for structure/safety systems on related Impreza models)

Active Features

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

Traction Control:

Traction Control System (TCS), Vehicle Dynamics Control (VDC)

AWD System:

Symmetrical All-Wheel Drive with DCCD for active traction management

Passive Features

Airbags:

Front dual-stage airbags, front side-impact airbags, curtain airbags

Seatbelts:

3-point height-adjustable front seatbelts with pretensioners and force limiters

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for Children) system

💡 Technology Features

Infotainment

Head Unit:

Standard AM/FM/CD/MP3 player with auxiliary input and USB port

Optional Infotainment:

Optional navigation system with touchscreen interface

Audio System:

Standard 4-speaker audio system, optional 6-speaker system with subwoofer

Driver Assistance

Cruise Control:

Standard electronic cruise control

Keyless Entry:

Standard keyless entry system

Connectivity

Bluetooth:

Optional Bluetooth hands-free connectivity

Performance Tech

Si Drive:

Subaru Intelligent Drive (SI-DRIVE) system with Intelligent (I), Sport (S), and Sport Sharp (S#) modes

Multi Function Display:

Multi-function display in instrument cluster showing performance data and vehicle status

🔧 Maintenance

Service Intervals

Oil Change Interval:

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

Engine Air Filter:

Inspect every 15,000 miles, replace as needed

Cabin Air Filter:

Replace every 15,000 miles or 12 months

Spark Plugs:

Replace every 60,000 miles (iridium type)

Brake Fluid:

Replace every 30,000 miles or 36 months

Clutch Fluid:

Inspect every 15,000 miles, replace as needed

Transmission Fluid:

Replace every 30,000 miles or 36 months (manual transmission)

Differential Fluid Front:

Replace every 30,000 miles or 36 months

Differential Fluid Rear:

Replace every 30,000 miles or 36 months

Fluid Specifications

Engine Oil:

0W-30 Synthetic (API SN or higher)

Engine Oil Capacity:

5.5 US quarts (5.2 liters) with filter

Coolant:

Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant

Power Steering Fluid:

Subaru ATF-HP or equivalent

Known Issues

Piston Ring Wear:

Potential for premature oil consumption or ring land failure in high-mileage or heavily modified engines

Clutch Wear:

Clutch can wear faster under aggressive driving conditions

Harmonic Balancer:

Failure of the harmonic balancer can lead to timing issues and engine damage

Intercooler Hoses:

Cracking or swelling of intercooler hoses can lead to boost leaks

📚 Vehicle History

Brand Heritage

Rally Connection:

Subaru's long and successful history in the World Rally Championship (WRC)

Model Evolution

Generations:

Fourth Generation (2008-2014), GVF (Hatchback) / GV (Sedan) chassis

Platform Sharing:

Based on the Subaru Impreza platform, but with significant performance enhancements

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Sports Compact Awards:

Consistently ranked as a top performer in sports compact and enthusiast car categories by automotive publications.

Handling Accolades:

Praised for its exceptional handling, braking, and all-wheel-drive capabilities.

Rally Heritage Recognition:

Recognized for maintaining its rally-bred DNA and performance heritage.