Subaru Impreza WRX STI 2012 Factory Service Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Codes Chassis Code: GVB Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Target Audience: Enthusiasts,...

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Stichworte: 2012 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

Target Audience:

Enthusiasts, rally fans, performance-oriented drivers.

Competitive Analysis

Competitors 2012:

Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R.

Key Features

Drivetrain:

Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD).

Engine Type:

Turbocharged Boxer Engine.

Suspension:

Performance-tuned suspension with inverted front struts.

Brakes:

High-performance Brembo braking system.

Transmission:

6-speed manual transmission.

📋 Manual Details

Coverage Areas

Coverage Summary:

Comprehensive service and repair information for the 2012 Subaru Impreza WRX STI.

Page Count

Estimated Page Count:

2000+

Manual Type

Manual Type:

Factory Service Repair Manual

Language

Language:

English

Format

Format:

Digital (likely PDF)

📖 Manual Coverage

Systems Covered

Engine System:

Detailed diagnostics, repair, and overhaul for the EJ257 turbocharged boxer engine, including fuel injection, ignition, emissions, cooling, and lubrication systems.

Transmission System:

Comprehensive coverage of the 6-speed manual transmission (TY856), including disassembly, assembly, and troubleshooting of gears, clutch, and drivetrain components.

Drivetrain System:

Information on the Symmetrical All-Wheel Drive system, including center differential, front and rear differentials, driveshafts, and wheel hubs.

Suspension System:

Detailed repair procedures for front and rear suspension components, including struts, springs, control arms, bushings, and anti-roll bars.

Brake System:

Complete information on the Brembo braking system, including ABS, EBD, brake fluid specifications, caliper and rotor replacement, and bleeding procedures.

Steering System:

Diagnosis and repair of the power steering system, including the steering rack, pump, and associated lines.

Electrical System:

Extensive coverage of the vehicle's electrical system, including wiring diagrams, component locations, fuses, relays, lighting, and battery system.

Body And Chassis:

Procedures for body panel repair, interior trim removal, glass replacement, and chassis component maintenance.

Climate Control System:

Diagnosis and repair of the air conditioning and heating systems, including refrigerant handling and component replacement.

Safety Systems:

Information on airbags, seatbelts, and vehicle security systems.

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, tire rotations, and general inspection procedures.

Diagnostic Procedures:

Step-by-step troubleshooting guides for common and complex issues, fault code interpretation, and wiring harness testing.

Repair Procedures:

Detailed, illustrated instructions for component removal, installation, and adjustment for all major vehicle systems.

Engine Rebuild:

Complete procedures for engine disassembly, inspection, component replacement (pistons, rings, bearings, valves), and reassembly.

Transmission Overhaul:

Detailed instructions for the complete disassembly, cleaning, inspection, and reassembly of the 6-speed manual gearbox.

Electrical Component Testing:

Methods for testing alternators, starters, sensors, actuators, and control modules.

Alignment Procedures:

Specifications and procedures for wheel alignment, including caster, camber, and toe settings.

Calibration Procedures:

Procedures for recalibrating sensors and systems after component replacement (e.g., ABS sensors, steering angle sensor).

Technical Depth

Depth Level:

Factory-level, in-depth technical information suitable for professional technicians and experienced DIY enthusiasts.

Diagnostic Tools:

Information pertaining to the use of Subaru's Select Monitor (SSM) diagnostic tool and OBD-II scan tools.

📊 Manual Specifications

File Format

File Type:

Searchability:

Searchable text for quick information retrieval.

Print Quality:

High-resolution, suitable for printing individual pages or sections.

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper Quality:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Code:

EJ257

Engine Type:

2.5L Turbocharged DOHC 16-Valve Boxer-4

Displacement:

2457 cc

Performance

Horsepower Hp:

305 hp @ 6000 rpm

Torque Lb Ft:

290 lb-ft @ 4000 rpm

Fuel System

Fuel Delivery:

Sequential Multi-Port Fuel Injection (MPI)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Engine Internals

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

🔧 Transmission

Standard

Type:

6-Speed Manual

Gear Ratios 1-6:

3.167 / 2.050 / 1.370 / 1.061 / 0.857 / 0.707

Reverse Gear Ratio:

3.545

Features

Drivetrain Type:

Symmetrical All-Wheel Drive (AWD)

Center Differential:

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

Fluid Specifications

Manual Transmission Fluid Spec:

API GL-4, SAE 75W-90 (Subaru Extra-S or equivalent)

Front Differential Fluid Spec:

API GL-5, SAE 80W-90 (Subaru Extra-S or equivalent)

Rear Differential Fluid Spec:

API GL-5, SAE 80W-90 (Subaru Extra-S or equivalent)

📐 Dimensions

Exterior

Length In:

179.7

Width In:

Height In:

Wheelbase In:

104.0

Front Track In:

Rear Track In:

Weights

Curb Weight Lbs:

Gross Vehicle Weight Rating Lbs:

Towing Capacity Lbs:

1500 (with optional trailer hitch, consult owner's manual for specifics)

Cargo

Cargo Volume Cu Ft:

11.3 (Sedan)

🛡️ Safety Features

Ratings

NHTSA Overall Rating:

4/5 Stars (for 2012 Impreza model range)

IIHS Top Safety Pick:

Yes (for 2012 Impreza model range)

Active Features

Yes, 4-wheel disc with ABS and EBD.

Traction Control:

Standard

Electronic Stability Control:

Standard (Vehicle Dynamics Control - VDC)

Passive Features

Airbags:

Front, side-curtain, front-seat side airbags.

Seatbelts:

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

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for Children) system.

💡 Technology Features

Infotainment

Head Unit:

Standard infotainment system with CD player, MP3 capability, auxiliary input, and available navigation system.

Audio System:

Available premium audio system (e.g., 9-speaker Harman Kardon).

Driver Assistance

Cruise Control:

Standard cruise control.

Keyless Entry:

Standard keyless entry with security system.

Connectivity

Bluetooth:

Available Bluetooth hands-free phone connectivity and audio streaming.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 3.75 months (severe driving) or 7,500 miles or 7.5 months (normal driving). Consult manual for specific recommendations based on driving conditions.

Air Filter Replacement:

Inspect every 15,000 miles, replace as needed. Subaru recommends replacement every 30,000 miles.

Cabin Air Filter Replacement:

Replace every 15,000 miles or 15 months.

Spark Plug Replacement:

Replace every 60,000 miles for iridium-tipped plugs.

Coolant Replacement:

First replacement at 60,000 miles or 5 years, then every 30,000 miles or 3 years thereafter.

Fluid Specifications

Engine Oil Spec:

SAE 0W-30 or 5W-30 Synthetic (API SN or ILSAC GF-5 certified). Refer to owner's manual for specific viscosity under varying temperatures.

Engine Oil Capacity Quarts:

5.0 quarts (with filter)

Brake Fluid Spec:

FMVSS No. 116 DOT 3 or DOT 4.

Power Steering Fluid Spec:

Subaru Genuine ATF or Dexron III equivalent.

Known Issues

Piston Ring Land Cracks:

A known issue on some EJ257 engines, particularly when subjected to aggressive tuning or poor maintenance. The manual will detail inspection procedures.

Clutch Wear:

Heavy clutch usage or aggressive driving can lead to premature wear. The manual provides diagnostic steps for clutch performance.

Oil Consumption:

Some EJ257 engines may exhibit higher than average oil consumption; regular checks are advised. Manual details potential causes and checks.

📚 Vehicle History

Brand Heritage

Rally Legacy:

Subaru's strong heritage in the World Rally Championship (WRC) with numerous manufacturer and driver titles.

Model Evolution

Generations:

The 2012 model represents the fourth generation of the Impreza WRX STI (GVA/GVB chassis code), marking a significant redesign from the previous generation.

Key Changes 2012:

Introduction of the new global platform, increased wheelbase, different styling, and the move to a hatchback-only body style in some markets (though sedan versions like the GVB are covered by this manual).

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Performance Awards:

Consistently praised by automotive publications for its performance, handling, and rally-bred capabilities.

Segment Leader:

Often cited as a benchmark for performance compacts.