2002 Subaru Legacy GT Limited, AutomaticFACTORY OEM SERVICE PROCEDURE

Throttle Position Sensor: Adjustment

  1. Turn ignition switch to OFF.
  2. Loosen throttle position sensor holding screws.
    Fig 1: Loosening Throttle Position Sensor Holding Screws
    G02959707Courtesy of SUBARU OF AMERICA, INC.
  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 

    1. (B136) No. 15 - (B136) No. 17 / 0.45 - 0.55 V 
    2. [Fully closed.] 
    Fig 2: Measuring Throttle Position Sensor Connector Terminals Voltage
    G02959708Courtesy of SUBARU OF AMERICA, INC.
  4. Tighten throttle position sensor holding screws.
    1. Tightening torque:  1.6 N.m (0.16 kgf-m, 1.2 ft-lb)
    Fig 3: Tightening Throttle Position Sensor Holding Screws
    G02959709Courtesy of SUBARU OF AMERICA, INC.
  5. 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
      G02959710Courtesy 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.