Engine Mechanical:
Detailed disassembly, inspection, assembly, and repair of the EJ257 engine, including timing belt, cylinder heads, pistons, crankshaft, oil system, and cooling system.
Engine Electrical:
Ignition system, fuel injection system, engine control unit (ECU) diagnostics, sensors, actuators, and wiring diagrams.
Transmission Manual:
DCCD (Driver Controlled Center Differential) operation, maintenance, and repair of the 6-speed manual transmission.
Transmission Automatic:
Not applicable for WRX STI model.
Drivetrain:
All-Wheel Drive (AWD) system, front and rear differentials, driveshafts, and hub assemblies.
Suspension:
Front and rear suspension components, struts, springs, control arms, bushings, and alignment procedures.
Brakes:
Brake system components (calipers, rotors, pads, lines), ABS (Anti-lock Braking System), and EBD (Electronic Brake-force Distribution).
Steering:
Power steering system, steering rack, and steering column.
Electrical System:
Battery, alternator, starter, lighting system, interior electronics, power accessories, and fuse/relay locations.
Body Exterior:
Body panels, doors, hoods, bumpers, spoilers, glass, and trim.
Body Interior:
Seats, dashboard, door panels, headliner, HVAC system, and interior trim.
HVAC:
Heating, Ventilation, and Air Conditioning (HVAC) system components, diagnostics, and service.
Diagnostics Troubleshooting:
Diagnostic Trouble Codes (DTCs), symptom-based troubleshooting charts, and diagnostic procedures.
Fuel System:
Fuel pump, injectors, fuel pressure regulator, fuel tank, and emissions control systems.
Exhaust System:
Exhaust manifold, catalytic converter, muffler, and related components.
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, coolant flushes, and brake fluid changes.
Major Repairs:
Engine rebuilds, transmission overhauls, suspension upgrades, and brake system servicing.
Component Replacement:
Detailed instructions for replacing individual components within all major systems.
Specifications Tolerances:
Torque specifications, clearances, fluid capacities, and dimensional tolerances for all repairs.
Wiring Diagrams:
Comprehensive electrical system wiring diagrams for all circuits.
Diagnostic Trouble Codes:
Detailed explanations and troubleshooting steps for all OBD-II Diagnostic Trouble Codes (DTCs).
Component Testing:
Procedures for testing the functionality of various electrical and mechanical components.
Depth Of Coverage:
Comprehensive factory-level technical information, suitable for professional technicians and advanced DIY enthusiasts.
Oil Change Interval:
Every 3,750 miles or 3 months, or 7,500 miles/6 months for synthetic oil (refer to manual for exact recommendation based on driving conditions).
Timing Belt Replacement:
Every 105,000 miles or 105 months (crucial for EJ257 engine).
Engine Oil:
SAE 0W-30 Full Synthetic (meeting Subaru specifications)
Coolant:
Subaru Super Coolant (Blue)
Transmission Fluid:
API GL-4 SAE 75W-90 (for 6MT), Subaru Extra-S or equivalent.
Differentials Fluid:
API GL-5 SAE 75W-90 (front and rear differentials).
Ej257 Ring Land Failure:
Common concern with EJ257 engines, often related to inadequate fueling, detonation, or aggressive tuning. Manual provides factory specs to mitigate this.
Clutch Wear:
High-performance nature can lead to faster clutch wear under aggressive driving conditions.
Dccd Actuator Failure:
Potential issue with the DCCD system's actuator, often indicated by a DCCD warning light.
