Subaru Car 1998-05

Throttle Position Sensor

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Operation



The throttle position sensor provides a signal to the ECM that is related to the relative throttle plate position. As the throttle plate moves in relation to driving conditions, a signal is sent to the control unit which adjusts the injector pulse width and air/fuel ratio. As the throttle plate is opened further, more air is taken into the combustion chambers, and as a result the relative fuel demand of the engine changes. The throttle position sensor relays this information to the ECM which in alters the fuel amount.

The throttle position sensor provides a signal to the ECM that is related to the relative throttle plate position. As the throttle plate moves in relation to driving conditions, a signal is sent to the control unit which adjusts the injector pulse width and air/fuel ratio. As the throttle plate is opened further, more air is taken into the combustion chambers, and as a result the relative fuel demand of the engine changes. The throttle position sensor relays this information to the ECM which in alters the fuel amount.

The throttle position sensor provides a signal to the ECM that is related to the relative throttle plate position. As the throttle plate moves in relation to driving conditions, a signal is sent to the control unit which adjusts the injector pulse width and air/fuel ratio. As the throttle plate is opened further, more air is taken into the combustion chambers, and as a result the relative fuel demand of the engine changes. The throttle position sensor relays this information to the ECM which in alters the fuel amount.

Removal & Installation



2.0L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the intercooler.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor retaining screws. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.2 ft. lbs.
  4.  

2.2L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining screws. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.7 ft. lbs.
  4.  

2.2L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining screws. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.7 ft. lbs.
  4.  

2.5L SOHC Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining screws. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.7 ft. lbs.
  4.  
  5. To adjust the sensor, turn the ignition switch OFF. Loosen the retaining screws.
  6.  
  7. Using a voltage meter, take out the ECM. Turn the ignition switch ON.
  8.  
  9. Adjust the TPS to the proper position to allow the voltage signal to the ECM to be within specification.
  10.  
  11. Specification is 0.45-0.55 volt. Specification is measured at connector B135 and terminal 13.
  12.  
  13. Tighten the retaining screws.
  14.  

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining screws. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.7 ft. lbs.
  4.  
  5. To adjust the sensor, turn the ignition switch OFF. Loosen the retaining screws.
  6.  
  7. Using a voltage meter, take out the ECM. Turn the ignition switch ON.
  8.  
  9. Adjust the TPS to the proper position to allow the voltage signal to the ECM to be within specification.
  10.  
  11. Specification is 0.45-0.55 volt. Specification is measured at connector B135 and terminal 13.
  12.  
  13. Tighten the retaining screws.
  14.  

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining screws. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 1.7 ft. lbs.
  4.  
  5. To adjust the sensor, turn the ignition switch OFF. Loosen the retaining screws.
  6.  
  7. Using a voltage meter, take out the ECM. Turn the ignition switch ON.
  8.  
  9. Adjust the TPS to the proper position to allow the voltage signal to the ECM to be within specification.
  10.  
  11. Specification is 0.45-0.55 volt. Specification is measured at connector B135 and terminal 13.
  12.  
  13. Tighten the retaining screws.
  14.  

3.0L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air intake chamber.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor retaining screws. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Testing



2.0L Engine
  1. Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
  2.  
  3. If the measured value is more than 10 ohm, replace the sensor.
  4.  

2.2L Engine
  1. Start the engine.
  2.  
  3. Using the Subaru scan tool, read the intake manifold absolute pressure signal.
  4.  
  5. If the value is less than 53.3 KPa, replace the sensor.
  6.  

  1. Start the engine.
  2.  
  3. Does the Subaru scan tool; indicate DTC P0122 or DTC P0123-
  4.  
  5. If not replace the sensor.
  6.  

2.5L DOHC Engine
  1. Turn the ignition switch OFF.
  2.  
  3. Disconnect the connector from the ECM.
  4.  
  5. Measure the resistance between the ECM connectors (connector B136 terminal 18/connector B136 and terminal 16).
  6.  
  7. If the measured value is more than 1 Mohm, replace the electric throttle.

    Click image to see an enlarged view

    Fig. Electric throttle connector location-Baja 2.5L DOHC engine

  8.  

  1. Turn the ignition switch OFF.
  2.  
  3. Measure the resistance between the electronic throttle control connector and ground (connector E57 terminal 6+ and ground).
  4.  
  5. If the measured value is more than 10 ohm, replace the sensor.
  6.  

Except STI
  1. Turn the ignition switch ON.
  2.  
  3. Measure the voltage between the sensor connector and ground (connector E13 and terminal 3).
  4.  
  5. If the voltage is less than 4.7 volts, replace the sensor.
  6.  

STI
  1. Measure the voltage between the electronic throttle control connector and ground (connector E57 terminal 6+ and ground).
  2.  
  3. If the measured value is more than 10 volt, replace the sensor.
  4.  

2.5L SOHC Engine
  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
  4.  
  5. If the measured value is more than 1 Mohm, replace the sensor.

    Click image to see an enlarged view

    Fig. Throttle position sensor connector location-Baja 2.5L SOHC engine

  6.  

  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
  4.  
  5. If the measured value is more than 1 Mohm, replace the sensor.
  6.  

  1. Measure the voltage between the electronic throttle control connector and ground (connector E57 terminal 6+ and ground).
  2.  
  3. If the measured value is less than 10 volt, replace the sensor.
  4.  

  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Turn the ignition switch ON.
  4.  
  5. Measure the voltage between the sensor and engine ground, (connector E13 terminal 3 and ground).
  6.  
  7. If the measured value is less than 4.9 volts, replace the sensor.
  8.  

  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
  4.  
  5. If the measured value is more than 1 Mohm, replace the sensor.
  6.  

  1. Turn the ignition switch OFF.
  2.  
  3. Measure the resistance between the electronic throttle control connector and ground (connector E57 terminal 6+ and ground).
  4.  
  5. If the measured value is more than 10 ohm, replace the sensor.
  6.  

3.0L SOHC Engine
  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Turn the ignition switch ON.
  4.  
  5. Measure the voltage between the sensor and engine ground, (connector E13 terminal 3 and ground).
  6.  
  7. If the measured value is less than 4.9 volts, replace the sensor.
  8.  

  1. Visually inspect the throttle linkage and throttle for binding and sticking.
  2.  
  3. Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
  4.  
  5. If the measured value is more than 10 ohm, replace the sensor.
  6.  

  1. Turn the ignition switch OFF.
  2.  
  3. Disconnect the connector from the ECM.
  4.  
  5. On 2005 vehicles, measure the resistance between the ECM connectors (connector B136 terminal 18 and connector B136 terminal 16).
  6.  
  7. If the measured value is more than 1 Mohm, repair the electronic throttle control.
  8.  

 
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