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.
Check Throttle Position Sensor
- 9G1: CHECK INPUT SIGNAL FOR TCM.
Read data of throttle position sensor using Subaru Select Monitor.
- Throttle position sensor input signal is indicated.
CHECK: Is voltage between 0.3 and 0.7 V when the accelerator pedal is completely released?
- YES: Go to step 9G2.
- NO: Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR .
- 9G2: CHECK INPUT SIGNAL FOR TCM.
CHECK: Is voltage between 4.3 and 4.9 V when the accelerator pedal is completely depressed?
- YES: Go to step 9G3.
- NO: Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR .
- 9G3: CHECK INPUT SIGNAL FOR TCM.
CHECK: Does voltage decrease smoothly when the accelerator pedal is fully depressed and then fully released?
- YES: Go to step gear position, CHECK GEAR POSITION.
- NO: Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR .
Use the Manual With the Right Hardware
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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.