Subaru WRX STI 2011 Workshop Manual (P/N G1130BE2)

This technical reference covers the 2012 Subaru Impreza WRX and WRX STI, with separate STI and non-STI engine sections for sedan and hatchback configurations. The two PDFs total 3,378 pages: a 3,352-page service manual and a 26-page New Car Information supplement.

Proper maintenance of the turbocharged powertrain and pressurized fuel system requires strict adherence to the manual’s safety precautions to prevent component damage or personal injury.

Covered Configurations

4-door sedans: GVE (WRX/WRX-S) and GVF (STI-S/SE). 5-door hatchbacks: GRE (WRX) and GRF (STI/SE). Factory lineup tables distinguish destination-specific versions for the U.S., Canada, and Mexico.

The engine chapters separate EJ257 high-power turbo STI applications from EJ255 turbo WRX applications. Drivetrain coverage distinguishes the STI’s six-speed manual with Driver’s Control Center Differential (DCCD) from the WRX’s five-speed manual with a viscous-coupling center differential. VIN and model-label decoding identify engine, transmission, and option codes.

System Coverage and Technical Breakdown

• Engine mechanical repair: Engine removal, cylinder-head and cylinder-block disassembly, piston and crankshaft inspection, valve-clearance adjustment, and timing-belt installation. Lubrication and cooling coverage extends to oil-pump inspection, oil-cooler service, water-pump replacement, and radiator-fan diagnosis.
• Turbo, fuel, and emissions: Turbocharger and intercooler removal, fuel-pressure testing, injector and fuel-pump service, and wastegate-control inspection. Dedicated material covers tumble generator valves, SI-DRIVE, AVCS diagnosis, secondary-air components, and evaporative-emissions faults. Intake/exhaust service includes catalytic converters and exhaust-pipe removal.
• Manual transmission and clutch: Separate 5MT and 6MT disassembly and reassembly procedures address shafts, gears, bearings, and front differentials. Clutch repair covers the flywheel, release mechanism, master and operating cylinders, and hydraulic bleeding.
• Chassis and brakes: Front and rear suspension service, wheel alignment, steering-gear overhaul, disc-brake repair, and parking-brake adjustment. ABS/VDC material includes sequence-control testing, control-module parameter registration, steering-angle centering, and yaw/G-sensor zero-point setting.
• Electrical diagnostics: Subaru Select Monitor procedures cover current data, freeze-frame information, active tests, and DTC-based fault isolation. Dedicated chapters address DCCD, CAN-network communication, TPMS, immobilizer faults, and control-module input/output signals.
• HVAC and restraints: Refrigerant pressure testing, recovery, charging, and leak checks accompany automatic A/C self-diagnosis. Airbag troubleshooting and occupant-detection calibration (rezeroing) after passenger-seat work have dedicated diagnostic coverage.

Driveline Details and Repair Limits

STI driveline references identify the helical front LSD and H3 Torsen rear differential, while the B2 non-LSD rear differential is covered separately. Rear-differential procedures include pinion-height selection, bearing preload, backlash, and tooth-contact inspection. The H3 differential case assembly is handled as a unit, not internally overhauled. Propeller-shaft, axle, drive-shaft, and hub-bearing removal and inspection are covered in the Drive Shaft System section.

The timing-belt chapter warns that independent camshaft rotation with the belt removed can bring intake and exhaust valves into contact and bend them.

Wiring Diagrams and Workshop References

Pin-numbered connector views accompany the Engine Electrical System and Driver’s Control Center Differential Control System diagrams. Power Supply Circuit and Ground Circuit drawings support circuit tracing, while the Air Conditioning System and CAN Communication System diagrams cover HVAC controls and network connections.

Tool references include the Subaru Select Monitor III kit 1B022XU0 and cam sprocket wrench 499977500. Component sections provide tightening torques, approved fluids and capacities, wear limits, clearance and adjustment data, and electrical test specifications. General Information includes unit-conversion tables.

Body and interior coverage includes lighting, the combination meter, power windows, locks, and audio/navigation. Seats, trim, trunk-lid and rear-gate service are covered as well. Structural reference points and body dimensions belong to the separate Impreza Body Repair Manual, rather than this set.

High-Level Section Map and Supplement

The service manual is organized into General Information, separate STI and non-STI engine sections, H4DOTC Engine Diagnostics, Transmission, Chassis, Body, and Wiring System. Periodic Maintenance Services is part of General Information.

The New Car Information supplement explains the addition of the Evaporative Leak Check Module (ELCM), revised PCV routing, VDC changes, and SD-card navigation. It also compares the CAN-controlled CHECK ENGINE lamp with the previous hardwired circuit. This supplement is a model-change reference, not a second repair volume.