P2127 code… So what's involved in fixing it?

Tacoma has been sputtering occasionally. Thought it was something else like fuel injection or fuel pump. It sort of died or I thought it did… but was still technically running just wouldn’t go. It finally displayed a code and was wondering if anyone has replaced this before and what was involved? Thanks!

 

Buy TPS for $25. Replace and done?

2 screws and a connector IIRC

 

It actually has to the with the accelerator pedal position sensor which is mounted on the side of the throttle body, could be a problem with the sensor or an open or shorted wire.
I'm not sure if the sensor is serviced separately from the throttle body or not, I don't believe it is

 

Been busy lately and went to get the Throttle Position Sensor I ordered yesterday. When I got home with it to change it I found out I had a problem. My TPS was a bigger part and had 4 pin connector instead of a 3 pin connector. Turns out mine is off of a Tundra. So I’ve got a FrankenTaco under my hood.

 

Well I believe I ordered the wrong part I should’ve gotten the “Throttle Pedal Sensor” not the “Throttle Position Sensor”… acronym confused I guess! Anyway so I need one of these?

where can I get the best deal on one?

A friend brought his diagnostic tool today and it said….

 

I’ve looked up part at several places and can’t find one for my 2003 TRD 3.4L 4x4 with automatic Transmission. OReillys, Autozone and Advance Auto Parts. Am I calling it the right thing or am I gonna have to buy the whole throttle body?

 

You are not the the first guy to have this problem.
https://www.tacomaworld.com/threads/2003-3-4-four-pin-tps.307070/

I zoomed in on the pic in the post and got this part # 89452-z2050

Use the Amazon one at your own risk.

$100 Toyota 89452-20050 Throttle Position Sensor

https://www.amazon.com/Genuine-Toyota-89452-20050-Throttle-Position/dp/B00FSDN2EA

 

That’s the part I originally mis ordered I need this part instead but haven’t been able to find it at the auto parts stores. They just have the Throttle Position Sensors… I need the accelerator pedal sensor or Throttle Pedal Sensor. Not sure as of yet what it’s called. This is it according to friend.

 

snap on diagnostic said this…

 

With hood up you can see it moving but RPM’s don’t change when depressing gas pedal till you’ve moved pedal about halfway down. So it’s not sending signal I guess….

 

I don't think that part is sold separately from the throttle body, have you looked at scan data what the app voltages are reading?

 

Toyota

I don’t think it is either. Here is a whole 15 page thread with guys “not too happy about it”.
Evidently you have to buy the whole throttle body.

 

hmmmm that sucks! Explain on the voltage part… that is above my knowledge. Thanks!

 

I'm not familiar with the 1st gen hybrid electronic throttle body system but typically on an electronic throttle body system you will have 2 or 3 sensors in the Acelerator Pedal and 2 on the Throttle Body that will change voltage at a different rate or inverse of each other as the pedal is pressed or the throttle is opened.

Typically 5v sensors should be in a range of 0.5v-4.5v, typically anything below about 0.45v will set a circuit low code and anything above 4.55v will set a circuit high code for that sensor.

You have circuit low codes so I would want to check wiring integrity before replacing the sensor.

I'll see what I can dig up in service info when I get time.

 

I just read through this again, the code in your original post had to do with the Accelerator Pedal Position Sensor but the codes in your later posts have to do with the Throttle Position Sensor and the other code is gone.
Is it possible your set them by having the Throttle Position Sensor unplugged and you haven't cleared the codes since?
Trying to figure out which code(s) we are actually chasing here.

 

Interesting that you said this because Tacoma has been setting in the garage for quite awhile. Cousin died had to go to Florida and other issues at work and home. Anyway I thought I had made a mistake and ordered wrong part but I guess I ordered correct one. One is called Throttle Position Sensor and I guess the other is Throttle Pedal Sensor??? Anyway friend the other day did diagnostic with tool he bought but hadn’t used yet. He mentioned that it was the Pedal sensor… then I was thinking maybe I went down and ordered the wrong part. Both were TPS and maybe I had misspoken when at O’Reillys. Thanks for rereading the text I was fretting over it a bit because I thought I bought a $90 part I didn’t need. I guess they don’t sell the other sensor with the cable attachment the “Throttle Pedal Sensor”.

Is it possible your set them by having the Throttle Position Sensor unplugged and you haven't cleared the codes since?
Trying to figure out which code(s) we are actually chasing here.

Answer to that is probably these…

kind of lost at this point on what is wrong. I’m use to changing out a part and off to races… this is a learning moment for me. Thanks for your help! Please continue!

 

I'm just curious since you have different codes than what you started with, it could be a bad part out of the box the way today's aftermarket parts are.

Since you said it was sitting a mouse chewing some wires is a possibility too.

Just from what Ive looked at in service info so far the data PIDs you wana look at are VPA1, VPA2, VTA1, and VTA2.

 

First off I replaced the Throttle Position Sensor for $90. When I got back from Florida and it didn’t change a thing from previous problem. Then I overheard a guy say he had the Snap On diagnostic tool and asked if he’d come by and use it on my truck. He did and we didn’t notice at first that his was saying Throttle PEDAL Sensor. At that point I just thought I had asked for wrong part… both are TPS as an acronym. TPS on O’Reillys checker and Adam’s The difference being Position and Pedal. He didn’t cancel out code unless it went off when I installed the Throttle Position Sensor and just didn’t know it. Currently it’s the pic above of his diagnostic tool. That’s where we are now.. so do you think sensor may be good but just not getting power or is it not reading right… so then current warning light?

 

Yea when it comes to TPS/APP codes it's best to look up the code description to see which one it's pointing to and do some testing on it to make sure it's bad before replacing.

I'm not sure at this point, I think I would want to clear the codes and see what comes back. I'd almost be tempted to put the old sensor back on and see if those codes go away and the original code comes back.

 

So do you have the electronics service manual? I don’t have one and not much knowledge on how to use it. I’ll have to get a friend to show me what your pointing out. Maybe take a pic of the page if you wouldn’t mind. Thanks!


Just from what Ive looked at in service info so far the data PIDs you wanalook at are VPA1, VPA2, VTA1, and VTA2