2003 Subaru Forester XS, AutomaticFACTORY OEM SERVICE PROCEDURE

Throttle Position Sensor: Adjustment

  1. Turn the ignition switch to OFF.
  2. Loosen the throttle position sensor holding screws.
    Fig 1: Locating Screw For Loosening Throttle Position Sensor
    G02945230Courtesy of SUBARU OF AMERICA, INC.
  3. When using voltage meter;
    1. Take out the ECM.
    2. Turn the ignition switch to ON.
    3. Adjust the throttle position sensor to the proper position to allow the voltage signal to the ECM to be in specification.

      Connector & terminal / Specified voltage 

      1. (B134) No. 3 (+) - (B134) No. 13 (-) / 0.45 - 0.55 V 
      2. [Fully closed.] 
      Fig 2: Checking Connector Terminal Voltage
      G02945231Courtesy of SUBARU OF AMERICA, INC.
    4. Tighten the throttle position sensor holding screws.

      Tightening torque: 

      1. 1.6 N.m (0.16 kgf-m, 1.2 ft-lb) 
    Fig 3: Locating Screws For Tightening Throttle Position Sensor
    G02945232Courtesy of SUBARU OF AMERICA, INC.
  4. When using Subaru Select Monitor;
    1. Turn the ignition switch to OFF.
    2. Loosen the throttle position sensor holding screws.
      Fig 4: Locating Screws For Loosening Throttle Position Sensor
      G02945233Courtesy of SUBARU OF AMERICA, INC.
Chapter Navigation
Return to Chapter: Throttle Position Sensor
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.