Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2012IMPREZA WRX STI F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWINSPECTION
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
Inspection
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION Inspection
General Description
INSPECTION
Before performing diagnostics, check the following item which might affect body integrated unit malfunctions.
1. Measure the battery voltage and check electrolyte.
Standard voltage: 12 V or more
Specific gravity: 1.260 or more
2. Check the fuse condition.
Make sure that ampere of the fuse is setting value, and it is not blown out.
(Be sure to check the back-up fuse also.)
3. Check the connecting condition of harness and harness connector.
4. 4) Confirm settings of body integrated unit are corresponded to vehicle equipment. Subaru Select Monitor
5. 5) Make sure that the User Customizing of the body integrated unit matches the vehicle equipment. Subaru Select Monitor
6. Confirm "Factory or Market setting" of body integrated unit registrations is "Market".
7. Confirm key illumination does not blink with ignition switch turned to ON.
INSPECTION
Before performing diagnostics, check the following item which might affect body integrated unit malfunctions.
1. Measure the battery voltage and check electrolyte.
Standard voltage: 12 V or more
Specific gravity: 1.260 or more
2. Check the fuse condition.
Make sure that ampere of the fuse is setting value, and it is not blown out.
(Be sure to check the back-up fuse also.)
3. Check the connecting condition of harness and harness connector.
4. 4) Confirm settings of body integrated unit are corresponded to vehicle equipment. Subaru Select Monitor
5. 5) Make sure that the User Customizing of the body integrated unit matches the vehicle equipment. Subaru Select Monitor
6. Confirm "Factory or Market setting" of body integrated unit registrations is "Market".
7. Confirm key illumination does not blink with ignition switch turned to ON.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.