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.
2025 Subaru Outback Limited XTFACTORY OEM SERVICE PROCEDURE
Throttle Sensor (Method With Circuit Tester)
NOTE:
Individual difference of the accelerator pedal may not be corrected sufficiently on the ECM side after the memory was cleared or the battery was removed and installed on the vehicle. Therefore, when the reference voltage is not reached after following the procedure, repeat the ignition switch ON (engine OFF) and ignition switch OFF operations 40 times at intervals of three seconds or more, and then measure the voltage again.
- Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
- Disconnect the connector from ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
- Attach the ST between the ECM, engine wiring harness and the bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD
.
Special tool:
CHECK BOARD (18460AA190)
- Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
- After warming-up the engine, turn the ignition switch to OFF.
- Turn the ignition switch to ON. (Engine OFF)
- Check the voltage between ECM connector terminals when accelerator pedal is fully closed and fully open.
Check
- When voltage is within standard values → Normal
- When voltage is not within standard values → It is possible that there is a connector connection failure, harness open circuit, short circuit, or malfunction of the throttle body. Perform inspection or replacement.
- If throttle sensor voltage does not change → Go to step 8.
Throttle sensor Accelerator pedal Terminal No. Standard Main Not depressed (full closed) 31 (+) - 23 (-) Approx. 0.7 V Depressed (full opened) Approx. 3.9 V Sub Not depressed (full closed) 15 (+) - 23 (-) Approx. 4.4 V Depressed (full opened) Approx. 1.1 V - Start the engine.
- Check the voltage between ECM connector terminals when accelerator pedal is fully closed and fully open.CAUTION: When depressing the accelerator pedal to fully open, perform it in as short a time as possible, but within the range where the inspection result is not adversely affected.
Factory Service Tools
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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.