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 SYSTEMSTHROTTLE POSITION SENSORTESTING AND INSPECTION
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
Throttle Position Sensor: Testing and Inspection
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION Testing and Inspection
Throttle Body
INSPECTION
THROTTLE SENSOR INSPECTION (METHOD WITH CIRCUIT TESTER)
1. Remove the lower inner trim of passenger's side.
2. Turn over the floor mat of passenger's seat.
3. Remove the protect cover.
4. Remove the nuts and bolts which hold the ECM to the bracket.
5. Turn the ignition switch to ON. (engine OFF)
6. Measure the voltage between ECM connector terminals.
7. After inspection, install the related parts in the reverse order of removal.
Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb)
THROTTLE SENSOR INSPECTION (METHOD WITH SUBARU SELECT MONITOR)
1. Turn the ignition switch to ON. (engine OFF)
2. Read the throttle opening angle signal and voltage of throttle sensor using Subaru Select Monitor. Subaru Select Monitor
OTHER INSPECTIONS
1. Check that the throttle body has no deformation, cracks or other damages.
2. Check that the engine coolant hose has no cracks, damage or loose part.
INSPECTION
THROTTLE SENSOR INSPECTION (METHOD WITH CIRCUIT TESTER)
1. Remove the lower inner trim of passenger's side.
2. Turn over the floor mat of passenger's seat.
3. Remove the protect cover.
4. Remove the nuts and bolts which hold the ECM to the bracket.
5. Turn the ignition switch to ON. (engine OFF)
6. Measure the voltage between ECM connector terminals.
7. After inspection, install the related parts in the reverse order of removal.
Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb)
THROTTLE SENSOR INSPECTION (METHOD WITH SUBARU SELECT MONITOR)
1. Turn the ignition switch to ON. (engine OFF)
2. Read the throttle opening angle signal and voltage of throttle sensor using Subaru Select Monitor. Subaru Select Monitor
OTHER INSPECTIONS
1. Check that the throttle body has no deformation, cracks or other damages.
2. Check that the engine coolant hose has no cracks, damage or loose part.
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.