Throttle Position Sensor: Adjustment

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

Fig 1: Identifying Throttle Position Sensor Holding Screws
Courtesy of SUBARU OF AMERICA, INC.
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
  Courtesy 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
  Courtesy of SUBARU OF AMERICA, INC.
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
  Courtesy of SUBARU OF AMERICA, INC.
  
  NOTE: For detailed operation procedures, refer to the SUBARU SELECT MONITOR OPERATION MANUAL.
3. Insert the cartridge to the Subaru Select Monitor.
  
  Fig 5: Inserting Cartridge To Subaru Select Monitor
  Courtesy of SUBARU OF AMERICA, INC.
4. Connect the Subaru Select Monitor to the data link connector.
  
  Fig 6: Connecting Subaru Select Monitor To Data Link Connector
  Courtesy of SUBARU OF AMERICA, INC.
5. Turn the ignition switch to ON, and the Subaru Select Monitor switch to ON.
6. Select {2. Each System Check} in Main Menu.
7. Select {Engine Control System} in Selection Menu.
8. Select {1. Current Data Display & Save} in Engine Control System Diagnosis.
9. Select {1.12 Data Display} in Data Display Menu.
10. Adjust the throttle position sensor to the proper position to match with the following specifications.
  Condition: Throttle fully closed
  
  Throttle opening angle 0.00%
  
  Throttle sensor voltage 0.50 V
11. Tighten the throttle position sensor holding screws.
  Tightening torque:
  
  1.6 N.m (0.16 kgf-m, 1.2 ft-lb)
  
  Fig 7: Identifying Throttle Position Sensor Holding Screws
  Courtesy of SUBARU OF AMERICA, INC.