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 MANUALSSUBARU2004OUTBACK BASE, 4D WAGON, EJ251, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYFUEL INJECTION (FUEL SYSTEMS) (H4SO)THROTTLE POSITION SENSORADJUSTMENT

2004 Subaru Outback Base, 4D Wagon, EJ251, Standard

Throttle Position Sensor: Adjustment

2004 Subaru Outback Base, 4D Wagon, EJ251, StandardSECTION Adjustment

Turn ignition switch to OFF.
Loosen throttle position sensor holding screws.

Fig 1: Loosening Throttle Position Sensor Holding Screws
Courtesy of SUBARU OF AMERICA, INC.
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.
  1. Connector & terminal/Specified voltage: (B135) No. 13 - (B135) No. 19/0.45 - 0.55 V [Fully closed.]
  Fig 2: Identifying Throttle Position Sensor Terminals
  Courtesy of SUBARU OF AMERICA, INC.
4. Tighten throttle position sensor holding screws.
  1. Tightening torque: 2.4 N.m (0.24 kgf-m, 1.7 ft-lb)
Fig 3: Tightening Throttle Position Sensor Holding Screws
Courtesy of SUBARU OF AMERICA, INC.
When using Subaru Select Monitor;
1. Turn ignition switch to OFF.
2. Loosen throttle position sensor holding screws.
  
  Fig 4: Loosening Throttle Position Sensor Holding Screws
  Courtesy of SUBARU OF AMERICA, INC.

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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.