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How can you tell if your throttle body positing sensor is bad

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  • Anonymous Mar 14, 2014

    if throttle position sensor is bad what problems will this cause?

  • Anonymous Mar 15, 2014

    what problems are caused when throttle position sensor goes bad

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Unplug the sensor and start the car try to notice the difference when plugging back on and if you had a scanner it will code tps sometimes dirt gets clogged up in the pallet and you can clean it with a clean rag and a little gas on it or a good cleaner then try the tps connections if good

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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When I push my gas pedal down about one inch the reduced power light comes on it don't stall just reduced power you shut the truck off restart it the light is off ,


The reduced power light is pertaining to the TAC - electronic throttle control . Is the check engine light lit ? If not still may have a DTC -diagnostic trouble code stored . You probably have a bad TPS - throttle position sensor .
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

Dec 31, 2015 | 2002 Chevrolet Chevrolet TrailBlazer EXT...

2 Answers

P2135 07 Suzuki swift


fly by wire.
Throttle body failure, clean it and pray.
bad TPS wires at same place.
- Faulty electric throttle control actuator (TP sensor 1 and 2)
- Throttle Position Sensor harness is open or shorted
- Throttle Position Sensor circuit poor connection
- Faulty accelerator pedal position sensor
http://helpforcars.net/obd_codes/p2135_suzuki.html

Oct 15, 2013 | Suzuki Cars & Trucks

3 Answers

Throttle position sensor screw is stripped


Cut off the head with a dremel tool

Remove the Sensor

Then work on the screw

Have you used at least a volt meter to test the sensor?

I can tell you a volt meter & a professional scan tool is
not much use, on that sensor

Only an oscilloscope will catch a bad or open spot

So maybe you don't need to change it

I would remove the throttle body & work on it,on
your work bench

Sep 13, 2013 | 2004 Dodge Ram 1500

3 Answers

Where is the throttle position senser located on 1993 ford f-150 5.8


  • The throttle position sensor is located just behind the throttle body assembly
  • Near the throttle bar. Do not pull or break it..

Sep 23, 2011 | Ford F-150 Cars & Trucks

1 Answer

2003 Yukon Denali XLT lights flicker, rpm goes up and down when on park or stopped or driving and slow speeds. Sometimes it turns off. I thought it might be bad spark plugs or cables so I changed them and...


Your vehicle has electronic throttle control . Position sensor's in the gas pedal an the throttle body , inputs to the Throttle Actuator Control Module
The TAC module is the control center for the throttle actuator control system. The TAC system is self-diagnosing and provides diagnostic information to the PCM through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated voltage to the TAC as directed by the PCM.

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM)
Accelerator Pedal Position (APP) Sensor
The accelerator pedal assembly contains 2 individual APP sensors within the assembly. The accelerator pedal position (APP) sensors 1 and 2 potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The APP sensors are used to determine the pedal angle. The control module provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module with signal voltage proportional to pedal movement. APP sensor 1 signal voltage is low at the rest position and increases as the accelerator pedal is applied. APP sensor 2 signal voltage is high at the rest position and decreases as the accelerator is applied.
Throttle Body Assembly
The throttle body assembly consists of the throttle body, the throttle position (TP) sensors, and the throttle actuator motor. The throttle body functions similar to a similar to a conventional throttle body with the following exceptions:
• An electric motor opens and closes the throttle valve.
• The throttle blade is spring loaded in both directions and the default position is slightly open.
• There are 2 individual TP sensors within the throttle body assembly.
The TP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The TP sensors are used to determine the throttle plate angle. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.

Flickering light's could be caused by a bad diode in the alternator . Fluctuating idle could be caused same alternator problem or dirty throttle plate.
Throttle Body Cleaning To Restore Idle Quality

Jul 15, 2017 | 2003 GMC Yukon

2 Answers

1991 toyota pickup dies when you release the gas pedal


There are couple of things I would check out that would cause this problem.

1. The Mass Air Flow Sensor. It measures how much air is going into the engine. Should be located on top of air filter box.

2. The air tube that goes from the Mass Air Flow Sensor to the throttle body. Check for leaks that would bypass air from going through the Mass Air Flow Sensor.

3. The Throttle Position Sensor. Located on the throttle body. This tells the computer what position the butterfly plate is on the throttle body. You control this plate with the gas pedal..

Oct 11, 2009 | 1991 Toyota Pickup

4 Answers

PO1290 CODE


I just got one today with the same problem; both lights and code p1290 hard to start and once started stayed at idle with no accelleration . If you have already fixed it would be nice to share the info. If not already done ill tell you when i fix this one.

Sep 18, 2009 | 2003 Isuzu Rodeo

1 Answer

Engine doen't stay idle at steady rpms rev up and down by itself


Either you have a vacuum leak, a bad throttle body position sensor, or a bad throttle body.

If the throttle body is drive by wire (electronic) then it would be a bad throttle body.

If the throttle body is drive by cable (manually driven by a cable connected to the gas peddle) then it would be a bad throttle position sensor.

If the throttle body is bad the check engine light wil lbe on. If it is on have your codes read at your local parts dealer for free, and this will give you a clue as to which pices/parts you need to replace.

Have the car leak tested and the vacuum linse inspected for leaks as well.

Jun 01, 2009 | 1989 Toyota Camry

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