Hyundai Cars 2006-2008

Throttle Position Sensor

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Operation



Specific to:

Hyundai Entourage 2007-2008

The Electronic Throttle Control (ETC) system is an electronically controlled throttle device which controls the throttle valve. It consists of the ETC motor, throttle body, and Throttle Position Sensor (TPS). A mechanical throttle control system receives a driver's intention via a wire cable between the accelerator and the throttle valve, while the ETC system uses the signal from the Accelerator Pedal Position (APP) sensor installed on the accelerator pedal. After the PCM receives the APP sensor signal and calculates the throttle opening angle, it activates the throttle valve by using the ETC motor. Additionally, it can handle the cruise control function without any special devices.

Specific to:

Hyundai Accent 2006-2008

Hyundai Azera 2006-2008

Hyundai Elantra 2006-2008

Hyundai Sonata 2006-2008

Hyundai Tiburon 2006-2008

The Throttle Position Sensor (TPS) is mounted on the throttle body and detects the opening angle of the throttle plate. The TPS has a variable resistor (potentiometer) that changes in resistance characteristics according to the throttle angle. During acceleration, the TPS resistance between the reference 5-volt and the signal terminal decreases and the output voltage increases; during deceleration, the TPS resistance increases and the TPS output voltage decreases. The ECM/PCM supplies a reference 5-volt to the TPS and the output voltage increases directly with the opening of the throttle valve. The TPS output voltage will vary from 0.2-0.8 volts at Closed Throttle (CT) to 4.3-4.8 volts at Wide Open Throttle (WOT). The ECM/PCM determines operating conditions such as idle (closed throttle), part load, acceleration/deceleration, and wide-open throttle from the TPS. Also the ECM/PCM uses the Manifold Absolute Pressure (MAP) sensor signal along with the TPS signal to adjust fuel injection duration and ignition timing.

Removal & Installation



Specific to:

Hyundai Entourage 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor retaining screws.
  8.  
  9. Remove the sensor from its mounting.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Exploded view of the Electronic Throttle Control (ETC) module

  2.  

Specific to:

Hyundai Accent 2006-2008

Hyundai Azera 2006-2008

Hyundai Elantra 2006-2008

Hyundai Sonata 2006-2008

Hyundai Tiburon 2006-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor retaining screws.
  8.  
  9. Remove the sensor from its mounting.
  10.  

To install:

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

Testing



Specific to:

Hyundai Entourage 2007-2008

  1. The Throttle Position Sensor (TPS) output voltage within the Electronic Throttle Control (ETC) module should vary from 0.2-0.8 volts at Closed Throttle (CT).
  2.  
  3. The TPS should vary from 4.3-4.8 volts at Wide Open Throttle (WOT).
  4.  
  5. Check the signal waveform compared to the Manifold Absolute Pressure (MAP) waveform as in the following illustration. The waveform should coincide.
  6.  
  7. The throttle angle should match the output voltage as in the specification table.
  8.  
  9. Measure the TPS resistance according to the sensor resistance table.
  10.  
  11. If the TPS does not meet specifications, replace the TPS.

    Click image to see an enlarged view

    Fig. Waveform of MAP sensor signal compared with the TPS signal waveform



    Click image to see an enlarged view

    Fig. Throttle angle and output voltage specification table



    Click image to see an enlarged view

    Fig. TPS resistance table



    Click image to see an enlarged view

    Fig. TPS connector end view and schematic diagram



    Click image to see an enlarged view

    Fig. TPS and ETC module mode of operation and troubleshooting chart

  12.  

Specific to:

Hyundai Accent 2006-2008

Hyundai Azera 2006-2008

Hyundai Elantra 2006-2008

Hyundai Sonata 2006-2008

Hyundai Tiburon 2006-2008

  1. The Throttle Position Sensor (TPS) output voltage should vary from 0.2-0.8 volts at Closed Throttle (CT).
  2.  
  3. The TPS should vary from 4.3-4.8 volts at Wide Open Throttle (WOT).
  4.  
  5. Check the signal waveform compared to the Manifold Absolute Pressure (MAP) waveform as in the following illustration. The waveform should coincide.
  6.  
  7. The throttle angle should match the output voltage as in the specification table.
  8.  
  9. If the TPS does not meet specifications, replace the TPS.

    Click image to see an enlarged view

    Fig. Waveform of MAP sensor signal compared with the TPS signal waveform



    Click image to see an enlarged view

    Fig. Throttle angle and output voltage specification table

  10.  

 
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