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Old 09-17-2016, 07:09 PM   #1
jay11
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Throttle body accelerator issue

Hi guys I just screwed up my car! Need some help!!

It’s a Nissan Altima 2005 2.5L

It was ok running car, only I had check engine sign due to code “P2135 Throttle/Pedal position sensor/switch A/ B Voltage Correlation”.

I thought before I spend couple of hundreds on changing the entire throttle body, let me try cleaning it up.

So I open the intake pipe and clean the air mass chamber and pipe, and the throttle body (without removing it). I thought it went pretty smooth. It had some decent amount of black grease which I cleaned up nicely using cotton soft cloth and “CRC 05078 Throttle Body” cleaner.

here is before and after.





I put everything back as it was. After I turn on the car, the accelerator is on! The effect is like somebody put a brick on the gas paddle!

In the opening/cleaning process, I did open (and reconnected) the electrical connector that was connected on the air mass body/pipe. Also the thin pipe that goes from the air body/pipe to the engine.

Although the engine error was most likely due to faulty sensor, but I thought I had nothing to lose, if cleaning doesn’t work, change the whole thing. But now with throttle going haywire, I can’t take it to auto store!

I really appreciate any help! Thanks!!
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Old 09-18-2016, 11:19 AM   #2
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Re: Throttle body accelerator issue

You need to do a throttle relearn

I found a Youtube video explaining the process

https://www.youtube.com/watch?v=afBmfKWDWZ4
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Old 09-18-2016, 11:35 AM   #3
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Re: Throttle body accelerator issue

Thanks Stealthee!
will try now and let you know.
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Old 09-18-2016, 12:28 PM   #4
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Re: Throttle body accelerator issue

ok. I gave it a go. didn't work. could be because my engine was not on the normal operating temp. when i start engine the temperature indicate low.

Am I suppose to leave the engine on in order to increase the temperature? I mean at current situation it seems pretty hazardous as the throttle/accelerator is always on. and the tachometer read 3/4! it makes loud noise. i didn't dare to keep it on for more then few seconds.


also here
I see little different procedure than the youtube video
http://www.altimaforums.net/idle-rel...ay-t3398.html?
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Old 09-18-2016, 12:45 PM   #5
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Re: Throttle body accelerator issue

Definitely try that too. Good luck.
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Old 09-18-2016, 01:22 PM   #6
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Re: Throttle body accelerator issue

yes other one didn't work either. main problem is probably the engine heat. my engine heat is not on the middle while i was doing it.

also, in one place I see it says, all the error code must be cleared in order to do this. is that true? as i already had a check engine on before all this... that also might be the problem.

BTW, is it safe to drive in this condition? at ideal/prk tachometer reads just under 3 and periodically jumps to 4
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Old 09-18-2016, 04:00 PM   #7
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Re: Throttle body accelerator issue

ok here is the update.
I first reset the error code. check engine light went off.
then i let it run for few minutes. engine heated up to middle.

then i tried the process. this time i was able to follow it. the light blink and went solid as it says in the 7th step.

but after i turned on again, i see the problem remain. however it did reduce the throttle at ideal. before it ideal at 2000- 3000rpm now it ideals at 1000-1800rpm.

i repeat the procedure two more times no improvements.

here is a video (1 MB)
https://www.dropbox.com/s/w884zfr3akqsohf/Throttle.mp4


anybody with ideal relearn experience, please let me know.

thanks again!
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