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What would be the tps voltage setting when the butterfly on the throttle body is closed?

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michigan man

edgar walker

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SOURCE: Replacing the throttle position sensor on my 93 Ford F150

try to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

Posted on Mar 21, 2009



  • 326 Answers

SOURCE: Is it necessary to reboot

no you shouldn,t have to do anything what is the vehicle doing now

Posted on Nov 22, 2010


mark mayes

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SOURCE: 4.0 ford explorer wont start without spraying starting fluid in throttle body

could need tuneup and may want to replace fuel filter....Thing i would do first....i hate starter fluid...really ******* rings in motor.....

Posted on Aug 19, 2012


Steve Bishop

  • 19 Answers

SOURCE: 95 f150 5,0 no throttle cableis ok

either a bad throttle position sensor (under throttle body) or non-functioning fuel pump (in the tanks)

Posted on Oct 28, 2012

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I have 1995 Chev S10 with a 2.2L. It stubles from stop bad. I have replaced fuel filters and tuned it up,no help.

Test the tps using procedure below.

Throttle Position Sensor (TPS)
The Throttle Position Sensor (TPS) is connected to the throttle shaft on the throttle body. It is a potentiometer with one end connected to 5 volts from the VCM and the other to ground. A third wire is connected to the VCM to measure the voltage from the TPS. As the throttle valve angle is changed (accelerator pedal moved), the output of the TPS also changes. At a closed throttle position, the output of the TPS is low (approximately 0.5 volts). As the throttle valve opens, the output increases so that, at wide-open throttle, the output voltage should be approximately 4.5 volts. By monitoring the output voltage from the TPS, the VCM can determine fuel delivery based on throttle valve angle (driver demand).


See Figures 1, 2 and 3

Backprobe with a high impedance voltmeter at TPS ground terminal and 5 volt reference signal terminal.
With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
If the voltage is not as specified, either the wiring to the TPS or the VCM may be faulty. Correct any wiring or VCM faults before continuing test.
Backprobe with a high impedance voltmeter at the TP signal terminal and the sensor ground terminal.
With the key ON and engine off and the throttle closed, the TPS voltage should be approximately 0.5-1.2 volts.
Verify that the TPS voltage increases or decreases smoothly as the throttle is opened or closed. Make sure to open and close the throttle very slowly in order to detect any abnormalities in the TPS voltage reading.
If the sensor voltage is not as specified, replace the sensor.


Fig. Fig. 1: Common Throttle Position Sensor (TPS) wiring diagram (wire color, terminal identification/location may vary on certain models)


Fig. Fig. 2: Using jumper wires and high impedance voltmeter, test between the sensor ground and reference terminals, the voltage should be approximately 5 volts


Fig. Fig. 3: Next test between the sensor signal and ground terminals, verify that the TPS voltage increases or decreases smoothly as the throttle is opened or closed.


Except 1998-99 2.2L Engines
See Figure 4


Fig. Fig. 4: Common Throttle Position Sensor (TPS)
Disconnect the negative battery cable and remove the air cleaner and if equipped, the gasket and bracket.
Disengage the electrical connector.
Unfasten the two TPS attaching screw assemblies.
Remove the TPS from the throttle body assembly.
Remove the TPS seal.

To install:
Install the TPS seal over the throttle shaft.
With the throttle valve closed, install the TPS on the throttle shaft.
Rotate it counterclockwise, to align the mounting holes.
Install the two TPS attaching screws.
Tighten the screws to 18 inch lbs. (2 Nm).
Engage the electrical connector.
If equipped, install the bracket and gasket air cleaner and gasket.Connect the negative battery cable.

1998-99 2.2L Engines
Disconnect the negative battery cable and remove the air cleaner outlet resonator.Remove the throttle body assembly.Unfasten the two TPS attaching screw assemblies.Remove the TPS from the throttle body assembly. To install:
With the throttle valve closed, install the TPS on the throttle body.Install the two TPS attaching screws. Tighten the screws to 27 inch lbs. (3 Nm).Install the throttle body.Install the air cleaner outlet resonator.Connect the negative battery cable.

Aug 20, 2017 | Cars & Trucks

2 Answers

Will a throttle position sensor stop my 2.2 sunfire from starting

not really
a faulty TPS will make it run and drive funny

you can test a TPS has the right voltage to it

and if the butterfly on the throttle body stays closed


Jan 20, 2017 | Cars & Trucks

1 Answer

I need to know the code po120

Throttle Position Sensor/Switch (TPS) A Circuit Malfunction
The TPS (Throttle Position Sensor) is a potentiometer that is mounted to the throttle body. It detects the throttle blade angle. As the throttle blade moves, the TPS sends a signal to the PCM (Powertrain Control Module). Usually a three wire sensor: A 5 volt reference from the PCM to the TPS, a ground from the PCM to the TPS, and a signal return from the TPS to the PCM. The TPS sends the throttle position information back to the PCM on this signal wire. When the throttle is closed the signal is near .45 volts. At WOT (Wide Open Throttle) the TPS signal voltage will approach a full 5 volts. When the PCM sees a voltage that is outside of normal operating range, P0120 will set. NOTE: The PCM knows that any large change in throttle position means a cooresponding change in manifold pressure (MAP). On some models the PCM will monitor MAP and TPS operation for comparison. Meaning that if the PCM sees a large percentage change in throttle position, it expects to see a cooresponding change in manifold pressure and vice versa. If it doesn't see this comparitive change, P0120 may set.

I’m happy to assist further over the phone at

Dec 11, 2014 | 2001 Toyota Sienna

1 Answer

2006 nissan altima wont start when hot. Like not

I assume it starts and runs fine when cold? It could be a faulty TPS. Since the TPS adjust the setting of the throttle (butterfly plate) inside the throttle body. If the throttle body is dirty it will give you satarting/running problems. Make sure its nice and clean. Then see what happens. If problem persists after cleaning I would suspect the TPS is bad.

Aug 31, 2014 | Cars & Trucks

2 Answers


throttle position sensor(TPS) its usually located on the throttle body on fuel injected cars.

Oct 06, 2012 | 1992 Ford F150 SuperCab

1 Answer

2006 chevy monte carlo 3.5 v6 tps replacement

A THROTTLE POSITION SENSOR (TPS) is usually located on the butterfly spindle so that it can directly monitor the position of the throttle valve butterfly.
Throttle actuator control(TAC), that code comes from that part of the system too.

Throttle body showing the sensor on the right.

Feb 07, 2012 | 2006 Chevrolet Monte Carlo

1 Answer

Where is TPS sensor location on engine of 2003 GMAC Yukon XL denali?

TPS is always on the side of the throttle body, attached to the butterfly/throttle blade. Remove the tube that goes from the air filter housing to the throttle body, it'll be directly across from the blade, usually a squarish box with 2 wires connected to it.

Jan 25, 2011 | 2003 GMC Yukon

1 Answer

Where is the tps throttle postion sensor on a 2001 safari van?

TPS is on the end of the throttle plate shaft on the exterior of the throttle body. The role of the TPS is to measure the actual degree of rotation of the throttle plate shaft. An electrical contact arm attached to the throttle shaft sweeps up and down aa carbon track which has applied to it 0volts at one end and 5 volts at the other. The contact of the throttle reads the voltages across this range. When 'closed; the voltage should be close to zero volts

Sep 11, 2010 | 2001 GMC Safari

3 Answers

98 lexus gs300 codes p1120 p1121

I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from (exacly same part toyota OEM)

"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

Nov 23, 2008 | 1998 Lexus Gs 300

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