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 MANAGEMENTTRANSMISSION CONTROL SYSTEMSRELAYS AND MODULES - TRANSMISSION AND DRIVETRAINRELAYS AND MODULES - DIFFERENTIALCONTROL UNITTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
Component Tests and General Diagnostics
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION Component Tests and General Diagnostics
OPERATION
When there is a problem with a part or module, DCCD manual mode display blinks. (DCCD manual mode display blinks even in AUTO mode condition.) The blinking starts from when the problem is detected, and continues until the ignition switch is turned OFF. The faulty parts can be recognized by reading DTC with the Subaru Select Monitor.
DCCD manual mode display is as shown in the figure.
INSPECTION
DIAGNOSIS:
DCCD manual mode display is open or shorted.
TROUBLE SYMPTOM:
DCCD manual mode display does not illuminate in manual mode.
WIRING DIAGRAM:
When there is a problem with a part or module, DCCD manual mode display blinks. (DCCD manual mode display blinks even in AUTO mode condition.) The blinking starts from when the problem is detected, and continues until the ignition switch is turned OFF. The faulty parts can be recognized by reading DTC with the Subaru Select Monitor.
DCCD manual mode display is as shown in the figure.
INSPECTION
DIAGNOSIS:
DCCD manual mode display is open or shorted.
TROUBLE SYMPTOM:
DCCD manual mode display does not illuminate in manual mode.
WIRING DIAGRAM:
RENDER: 1.0x
NO RELATED
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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.