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gas pedal the rpms in my car jump..rev..throttle body..sensors

 
mike kelly's Avatar
  • Answered by:mike kelly
  • Hyundai Mechanic
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Customer Question

sometimes when i take my foot off the gas pedal the rpm's in my car jump up, starts to rev real high. i have had the throttle body cleaned and aslo had the fuel injection system flushed. they ran a diagnostic on the car and found no issues with the sensors. the also reset the onboard computer. this helped with the high idleing in park but not with the sudden rev up when the gas pedal is released

 

Country: United States
Make: Hyundai
Model: Santa Fe
Year: 2005

Already Tried:
fuel injection system flush, throttle body cleaned, diagnostic test, reset of the computer

Submitted: 378 days and 7 hours ago.
Category: Hyundai
Value: $18
Status: CLOSED
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Expert:  mike kelly replied378 days and 7 hours ago.

Hi,how are you?From what you are describing,this is consistent with the throttle position sensor short circuiting at times as long as the sensor has not fully failed it generally will not throw a trouble code.

Customer replied378 days and 7 hours ago.

how much does it usually cost to have the throttle position sensor replaced

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Expert:  mike kelly replied378 days and 7 hours ago.

The sensor is about $70.00

 

 

 

 

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/PCM detects the throttle valve opening based on the TPS output voltage.

Removal & Installation

 

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

 

To install:

  1. Installation is the reverse of the removal procedure.

 

Testing



2.4L Engine

  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 1 (sensor ground) and terminal 2 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 1 (sensor ground) and terminal 3 (sensor output).
  5. 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.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.


2.7L Engine

  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 2 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 2 (sensor ground) and terminal 3 (sensor output).
  5. 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.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.

 

  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 2 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 1.6-2.4 kohm.
  4. Connect and analog ohmmeter between terminal 2 (sensor ground) and terminal 3 (sensor output).
  5. 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.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.


3.5L Engine

  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 3 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 3 (sensor ground) and terminal 2 (sensor output).
  5. 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.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.

 

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Expert:  mike kelly replied371 days and 10 hours ago.

Hi,let meknow if you need further assistance,thank you.

 
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