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 MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSDTC 31TRANSMISSION CONTROL SYSTEMS
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Transmission Control Systems
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Transmission Control Systems
DTC 31 THROTTLE POSITION SENSOR
DIAGNOSIS: Input signal circuit of throttle position sensor is open or shorted.
TROUBLE SYMPTOM: Shift point too high or too low; excessive shift shock; excessive tight corner "braking".
WIRING DIAGRAM:
- 2.5 L ENGINE MODEL
- 3.0 L ENGINE MODEL
Test Steps 1
Test Steps 2 through 5
Test Steps 6 through 11
Test Steps 12 through 16
Test Steps 17 through 18
DIAGNOSIS: Input signal circuit of throttle position sensor is open or shorted.
TROUBLE SYMPTOM: Shift point too high or too low; excessive shift shock; excessive tight corner "braking".
WIRING DIAGRAM:
- 2.5 L ENGINE MODEL
- 3.0 L ENGINE MODEL
Test Steps 1
Test Steps 2 through 5
Test Steps 6 through 11
Test Steps 12 through 16
Test Steps 17 through 18
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.