2001 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Check Throttle Position Sensor

  1. 9G1: CHECK INPUT SIGNAL FOR TCM. 

    Read data of throttle position sensor using Subaru Select Monitor.

    • Throttle position sensor input signal is indicated.

    CHECK: Is voltage between 0.3 and 0.7 V when the accelerator pedal is completely released? 

    1. YES:  Go to step 9G2. 
    2. NO:  Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR  .
  2. 9G2: CHECK INPUT SIGNAL FOR TCM. 

    CHECK: Is voltage between 4.3 and 4.9 V when the accelerator pedal is completely depressed? 

    1. YES:  Go to step 9G3. 
    2. NO:  Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR  .
  3. 9G3: CHECK INPUT SIGNAL FOR TCM. 

    CHECK: Does voltage decrease smoothly when the accelerator pedal is fully depressed and then fully released? 

    1. YES:  Go to step gear position, CHECK GEAR POSITION. 
    2. NO:  Check throttle position sensor circuit, see DTC 31: THROTTLE POSITION SENSOR  .
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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.

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