2004 Subaru Impreza RS, 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: Identifying Throttle Position Sensor Holding Screws
    G00800551Courtesy of SUBARU OF AMERICA, INC.
  3. When using a voltmeter;
    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 (B135) 

      No. 13 (+) - (B135) No. 19 (-) /0.45 - 0.55 V 

      [Fully closed] 

      Fig 2: Measuring Voltage At Throttle Position Sesnsor Terminal
      G00800552Courtesy of SUBARU OF AMERICA, INC.
    4. Tighten the throttle position sensor holding screws.

      Tightening torque: 

      1.6 N.m (0.16 kgf-m, 1.2 ft-lb) 

      Fig 3: Identifying Throttle Position Sensor Holding Screws
      G00800553Courtesy 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: Identifying Throttle Position Sensor Holding Screws
      G00800554Courtesy of SUBARU OF AMERICA, INC.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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