Kia_Sephia_Rio_Spectra_Optima_1998-2006

Throttle Position Sensor (TPS)

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Operation



The throttle position sensor is a rotating type variable resistor that rotates with the throttle body-s throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the throttle angle of the sensor changes and the ECM detects the throttle valve opening based on the TPS output voltage.

The throttle position sensor is a rotating type variable resistor that rotates with the throttle body-s throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the throttle angle of the sensor changes and the ECM detects the throttle valve opening based on the TPS output voltage.

On the 1.8L engine, 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. On the 2.0L engine, the throttle position sensor is a rotating type variable resistor that rotates with the throttle body-s throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the throttle angle of the sensor changes and the ECM detects the throttle valve opening based on the TPS output voltage.

Removal & Installation



  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.  

  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.  

  1. Be sure the engine is in the OFF position.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor retaining bolts.
  6.  
  7. Remove the sensor.
  8.  

To install:

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

Testing



2000-2003
  1. Disconnect the connector from the sensor.
  2.  
  3. Connect an ohmmeter between sensor terminals 1 and 3.
  4.  
  5. Verify that the resistance increases according to throttle angle.
  6.  
  7. Specification should be 2 kohms (plus or minus 0.4 kohm) with the throttle valve closed.
  8.  
  9. If not within specification, replace the sensor.
  10.  

2001
  1. Disconnect the connector from the sensor. Connect an ohmmeter.
  2.  
  3. Measure the resistance between terminals 1 (sensor ground) and 2 (sensor power)
  4.  
  5. Specification should be 3.5-6.5 kohm for the 2.4L engine and 1.6-2.4 kohm for the 2.5L engine.
  6.  
  7. Connect an analog ohmmeter between terminals 1 (sensor ground) and 3 (sensor output), on 2.4L engine and between terminals 2 (sensor ground) and 3 (sensor output), on 2.5L engine.
  8.  
  9. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  10.  
  11. If the resistance is out of specification, or fails to change smoothly, replace the sensor.
  12.  

2001-2005
  1. Disconnect the sensor electrical connector.
  2.  
  3. Connect an ohmmeter between sensor terminals 1 and 2.
  4.  
  5. Verify that the resistance increases linearly according to throttle angle.
  6.  
  7. Specification should be 1.6-2.4 ohm (throttle valve closed).
  8.  
  9. If resistance does not meet specification, replace the sensor.
  10.  
  11. Verify that the throttle is at the closed throttle position.
  12.  
  13. Turn the ignition switch ON (engine OFF).
  14.  
  15. Connect a voltmeter between terminal 2 (L/G) and terminal 3 (L/O) on the TPS connector.
  16.  
  17. Measure the voltage at the full open and full closed positions.
  18.  
  19. Specification is 0.2-0.8 volt (full closed position) and 4.0-4.8 volts (full open position).
  20.  
  21. If not within specification, replace the sensor.
  22.  

2002-2003
  1. Disconnect the connector from the sensor. Connect an ohmmeter.
  2.  
  3. Measure the resistance between terminals 3 (sensor ground) and 2 (sensor power) on 2.4L engine and between terminals 2 (sensor ground) and 3 (sensor power) on 2.7L engine.
  4.  
  5. Specification should be 3.5-6.5 kohm for the 2.4L engine and 1.6-2.4 kohm for the 2.7L engine.
  6.  
  7. Connect an analog ohmmeter between terminals 3 (sensor ground) and 1 (sensor output), on 2.4L engine and between terminals 2 (sensor ground) and 1 (sensor output), on 2.7L engine.
  8.  
  9. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  10.  
  11. If the resistance is out of specification, or fails to change smoothly, replace the sensor.
  12.  

2004-2005
  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect the TPS connector.
  4.  
  5. Using an ohmmeter, measure the resistance between terminals 1 and 2 of the TPS connector.
  6.  
  7. Using an ohmmeter, measure the resistance between terminals 2 and 3 of the TPS connector.
  8.  
  9. Specification at terminal 1 and 2 should be 0.71-1.38 kohms at closed throttle and 2.7 kohms at WOT.
  10.  
  11. Specification at terminal 2 and 3 should be 1.6-2.4 kohms at all throttle positions.
  12.  
  13. If not within specification, replace the sensor.
  14.  

2004-2006
  1. Disconnect the connector from the sensor. Connect an ohmmeter.
  2.  
  3. Measure the resistance between terminals 1 (sensor ground) and 2 (sensor power) on 2.4L engine and between terminals 2 (sensor ground) and 3 (sensor power) on 2.7L engine.
  4.  
  5. Specification should be 1.6-2.4 kohm.
  6.  
  7. Connect an analog ohmmeter between terminals 1 (sensor ground) and 2 (sensor output), on 2.4L engine and between terminals 2 (sensor ground) and 1 (sensor output), on 2.7L engine.
  8.  
  9. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  10.  
  11. If the resistance is out of specification, or fails to change smoothly, replace the sensor. **Rio**

    Click image to see an enlarged view

    Fig. Underhood sensor locations-Rio 2006

  12.  

2006
  1. Disconnect the connector from the sensor.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals 2 and 3 (component side).
  4.  
  5. Specification should be 1.6-2.4 kohm at 68°F.
  6.  
  7. If not within specification, install a known good sensor and recheck. Replace the sensor, as required.
  8.  
  9. If within specification, install a known good ECM/PCM and recheck. Replace the component, as required.
  10.  

  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect the TPS connector.
  4.  
  5. Using an ohmmeter, measure the resistance between terminals 2 and 3 of the TPS.
  6.  
  7. Specification should be 1.6-2.4 kohms at all throttle positions.
  8.  
  9. With the connector still disconnected, measure the resistance between terminals 1 and 2.
  10.  
  11. Operate the throttle valve slowly from the idle position to the full open position and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  12.  
  13. Specification should be 0.71-1.38 kohm at closed throttle valve and 2.7 kohm at wide open throttle.
  14.  
  15. If within specification, check for poor connection between the PCM and the component.
  16.  
  17. If not, substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  18.  

 
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