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.
2003 Subaru Outback F4-2.5L SOHCFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Adjustments
ADJUSTMENT
1. Turn ignition switch to OFF.
2. Loosen throttle position sensor holding screws.
3. When using voltage meter;
1. Take out ECM.
2. Turn ignition switch to ON.
3. Adjust throttle position sensor to the proper position to allow the voltage signal to ECM to be in specification.
Connector & terminal / Specified voltage
(B135) No. 13 - (B135) No. 19 / 0.45 - 0.55 V [Fully closed.]
4. Tighten throttle position sensor holding screws.
Tightening torque: 2.4 N.m (0.24 kgf-m, 1.7 ft-lb)
4. When using Subaru Select Monitor;
1. Turn ignition switch to OFF.
2. Loosen throttle position sensor holding screws.
NOTE: For detailed operation procedures, refer to the Subaru Select Monitor Operation Manual.
3. Insert the cartridge to Subaru Select Monitor.
4. Connect Subaru Select Monitor to the data link connector (A).
5. Turn ignition switch to ON, and Subaru Select Monitor switch to ON.
6. Select {2. Each System Check} in Main Menu.
7. Select {Engine Control System} in Selection Menu.
8. Select {1. Current Data Display & Save} in Engine Control System Diagnosis.
9. Select {1.12 Data Display} in Data Display Menu.
10. Adjust throttle position sensor to the proper position to match with the following specifications.
Condition: Throttle fully closed
Throttle opening angle 0.00%
Throttle sensor voltage 0.50 V
11. Tighten throttle position sensor holding screws.
Tightening torque: 2.4 N.m (0.24 kgf-m, 1.7 ft-lb)
1. Turn ignition switch to OFF.
2. Loosen throttle position sensor holding screws.
3. When using voltage meter;
1. Take out ECM.
2. Turn ignition switch to ON.
3. Adjust throttle position sensor to the proper position to allow the voltage signal to ECM to be in specification.
Connector & terminal / Specified voltage
(B135) No. 13 - (B135) No. 19 / 0.45 - 0.55 V [Fully closed.]
4. Tighten throttle position sensor holding screws.
Tightening torque: 2.4 N.m (0.24 kgf-m, 1.7 ft-lb)
4. When using Subaru Select Monitor;
1. Turn ignition switch to OFF.
2. Loosen throttle position sensor holding screws.
NOTE: For detailed operation procedures, refer to the Subaru Select Monitor Operation Manual.
3. Insert the cartridge to Subaru Select Monitor.
4. Connect Subaru Select Monitor to the data link connector (A).
5. Turn ignition switch to ON, and Subaru Select Monitor switch to ON.
6. Select {2. Each System Check} in Main Menu.
7. Select {Engine Control System} in Selection Menu.
8. Select {1. Current Data Display & Save} in Engine Control System Diagnosis.
9. Select {1.12 Data Display} in Data Display Menu.
10. Adjust throttle position sensor to the proper position to match with the following specifications.
Condition: Throttle fully closed
Throttle opening angle 0.00%
Throttle sensor voltage 0.50 V
11. Tighten throttle position sensor holding screws.
Tightening torque: 2.4 N.m (0.24 kgf-m, 1.7 ft-lb)
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.