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I have a 2002 f-350 with 7.3 turbo. Changed tps and peddle assembly. Had throttle for 2 miles. now no throttle again , and get p0221 code. Where do I look next

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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

1 Answer

2001 MDX will not idle

Error Code: P0221
Throttle Position (TP) Switch/Sensor B
Accelerator Pedal Position (APP) Switch/Sensor B Range/Performance Problem
Possible Cause:
- Accelerator cable adjustment.
- Throttle position (TP) switch/sensor .
- Accelerator pedal position (APP) switch/sensor.
- Check valve clearance, adjust if required.

Mar 03, 2014 | 2001 Acura MDX

1 Answer

P0221 and P0231

the p0221 is not the cat
P0221 Throttle Petal Position Sensor Switch Circuit Range Performance... and neither is the p0231 code
P0231 OBD II Trouble Code you can try reset by disconnecting battery but most likely will come back if not repaired the two codes are fuel management problems and both are circuit have another mechanic check system and problems are is it can stall and not start --not start --or stall wile driving

Jul 11, 2017 | 2003 Audi A4 Cabriolet

1 Answer

My engine light came on in my 2007 chevy montecarlo. when the engine light came on my car read engine has lost power. From that point my car would'nt go pass 15 miles per hour. Now when this happened the...

Codes don't always mean a bad senors. One new TPS sensor would have me moving on to something else. Put a scan tool on it and not just a code reader. Check fuel pressure with the gauge on the windshield as you drive.

Feb 07, 2010 | 2007 Chevrolet Monte Carlo

4 Answers

On a 04 camry with 2.4 ltr engine, can I replace just the throttle position sensor or do i have to replace the entire throttle body? The engine code said faulty throttle body.

I think the terms "Throttle Positon Sensor", TPS and "Throttle Body" can be misleading at least in regards to the 04 Camry.

My 04 Camry gave a diagnostic reading of P2121 for my problem "Throttle PEDAL position switch D circuit". However, we changed out the complete Throttle Body/TPS (Toyota Part #22030-0H020) that did NOT fix problem.

The 04 Camry TPS Electronic Module "Throttle Positon Sensor" is factory assembled and riveted to the side of the throttle body. The only way to service/inspect it would be to cut off or drill out the rivets. Not sure you could open the darn thing if you got it off, but that seems to be the only way Toyota sells them!!

Hopefully a new Throttle PEDAL Position Sensor (Toyota Part # 78010-33010 PEDAL ASSY, ACC)
will fix it. This is located under the dash near the accelerator pedal.

So, now I would recommend FIRST to replace the "Throttle PEDAL Positon Sensor" (it is much, much cheaper) and then the Throttle Body/TPS assembly!! Unless of course, you get a diagnostic code as you did for "faulty throttle body!!

Nov 12, 2009 | 2004 Toyota Camry

2 Answers

Chevy Cobalt '06 The vehichle TPS is reading at 36% when the car is off Scan tool commits that the percentage should be at 0% -I have replaced the TPS at gas pedal ..did not solve do I recalibrate...

The TAC (throttle actuator control) is where both TPS sensors reside. On an older system this would be the throttle body. This system uses redundant TPS and APP (accelerator pedal position) sensors. If the problem were with the APP then you should have a code for a correlation problem between the TPS and APP or one APP sensor to the other. The most common issue by far that I have found is carbon build up in the throttle bore causing the plate to be stuck open. Remove the air intake tube from the TAC assembly and see if there is a ring of carbon around the area of the throttle plate. If so then using carb spray and an old toothbrush, clean the throttle body out. You can hold the plate open manually to do this but make certain the key is off or you will set several other codes and the throttle plate will fight against you. You can also remove the TAC assembly to clean if you like, though I do not recommend it. When you are done you will need to start the vehicle and run in drive for a minute or so, then to park or neutral. A couple of these cycles will usually relearn the position of the plate so that you can test drive. (Carb cleaner in the intake manifold will usually make the first start difficult.) Clear the codes, test drive the vehicle normally, but increase the take off and stop hard a few times after a few minutes of easy driving. Check and clear any codes that may have set on the test drive. You will want to drive again normally and check for codes again. If you do not have carbon the most likely culprit will be the TAC itself. The TPS sensors are intergral so you usually need to replace the whole TAC. Though I have seen only a handful of them that actually need replacement.
Good luck

Sep 20, 2009 | 2006 Chevrolet Cobalt

2 Answers

Throttle/Pedal Position Sensor/Switch B Circuit Range Performance

there is no adjustment on these tps's it's a drive by wire system. If you don't know the vehicle, dont post!
there's 2 sensors contained in the pedal sensor, and one on the throttle plate shaft, more often than not, it's the pedal sensor, and if you replaced that, it's the other one or a loose connection. did you reset the computer after replacing the pedal?

Sep 13, 2009 | 2002 Volkswagen Beetle Turbo S

1 Answer

'94 s10 4.3L Vin (W) RPM bounces from 500 to 1500 and back again. replaced: fuel pump (2/05) and filter (2/09), PCV valve (2/09), EGR valve (2/09); fuel pump output is up to spec, each time I did...


It sounds like the (TPS) is bad on it it will cause this problem but it should show a trouble code . The (TPS) is on the throttle body this is what it sounds like to me.

Feb 26, 2009 | 1994 Chevrolet S-10

3 Answers

944 turbo throttle dropout problem

I would start with the TPS, and if it doesn't solve it then the AFM would be the problem.

Nov 22, 2008 | 1986 Porsche 944

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