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Throttle Position Sensor Issue?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by paco pena, Dec 15, 2014.

  1. Dec 15, 2014 at 3:15 PM
    #1
    paco pena

    paco pena [OP] Member

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    My 2014 DCLB V6 auto Tacoma has an intermittent loss of power. It only happens every couple of weeks or so. The circumstances are always the same with it happening as you coast through a slow turn and then accelerate out of it. When you initially get on the throttle there is a complete lack of acceleration as if there was no connection between the gas pedal and the throttle body. It can last a couple of seconds and eventually goes as you press the gas pedal further down. The engine remains at a constant idle speed and the tach is steady. The engine does not run rough or the idle speed vary. Not a lot of laughs if you are going through an intersection which is where it always happens. Any thoughts?
    I can see issues getting anything done at the dealership as it is so intermittent and wont happen on the test drive.

    Paco
     
  2. Dec 15, 2014 at 3:23 PM
    #2
    scottalot

    scottalot X

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    Welcome to TW :)
    Not sure I cn help much with your issue ither than hopeit starts repeating itself enough to throw a code.
    May try different gas :confused:
    Being a new truck this needs to be the dealers problem.
     
    TomTwo likes this.
  3. Dec 15, 2014 at 5:41 PM
    #3
    landphil

    landphil Wishin' I was Fishin'

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    Try pulling up on the brake pedal with your left toe when it happens and see if the throttle response returns, it might be a misadjusted or faulty brake pedal switch activating the accelerator interlock.
     
  4. Dec 16, 2014 at 10:36 AM
    #4
    paco pena

    paco pena [OP] Member

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    Interesting idea but not the issue. You can place your foot on the brake and run the engine up to a fast idle against the converter and the engine doesnt cut out. I suspect the engine only throttles back when a certain throttle position has been reached.

    Paco
     
  5. Dec 16, 2014 at 10:39 AM
    #5
    Lord Helmet

    Lord Helmet Prepare To Attack

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    x2
     
  6. Dec 18, 2014 at 6:00 PM
    #6
    landphil

    landphil Wishin' I was Fishin'

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    If you apply the brakes FIRST, then the throttle is not affected.

    If you apply the brakes AFTER depressing the throttle, the engine will drop off to idle. Go for a drive and try it.;)
     
    TomTwo likes this.
  7. Jan 7, 2015 at 8:12 PM
    #7
    paco pena

    paco pena [OP] Member

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    After considerable research I was advised to disconnect the battery for 15 minutes and the vehicle goes through a learning phase. I was told to drive it somewhat more aggressively in particular to the situation where the throttle wasn't responding. After 3 days of putting a bit more foot in it the condition has not returned. That was 2 weeks ago and no further issues. If you have a similar issue its worth a try.

    Paco
     
    wheeliest and TomTwo like this.
  8. Jan 7, 2015 at 8:15 PM
    #8
    TXpro4X4

    TXpro4X4 Whatever blows your hair back!

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    Sweet
     
  9. Mar 13, 2015 at 1:02 PM
    #9
    Count Coconut

    Count Coconut Active Member

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    My 2006 TRD has been doing this same prob. for a while now. Today on the way home it's happened about 50 times. Enough that I could try different things. At highway speeds just cruising at 100kmh it would cut out. I can shift into 4 (automatic) and the engine will still have power loss. Normally if I shift to 4 the rpm will pick up and I have more power. So that means it's not RPM or transmission related.

    I'm thinking this is something electronic related to the gas pedal or ECU. OP, has your issues returned? My truck is almost not driveable like this.
     
  10. Mar 13, 2015 at 4:36 PM
    #10
    paco pena

    paco pena [OP] Member

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    The problem has not returned for me. I never had a problem on a straight run. Always coasting into a corner at idle and gently accelerating out.

    Paco
     
  11. Mar 14, 2015 at 6:02 AM
    #11
    Count Coconut

    Count Coconut Active Member

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    I will try the battery disconnect today. I have ordered a new URD fuel pump and filter just in case. It is almost undrivable like this, and it just happened out of the blue. Normally it happens once a week only.
    Thanks!
     
  12. Dec 24, 2018 at 9:44 AM
    #12
    pye314

    pye314 Well-Known Member

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    @Count Coconut Did this get resolved? I’ve been fighting the same thing for months, tried MAF, tps and throttle body, cleaned everything, plugs, fuel pump/filter, i fixed it 100% with a new throttle body and position sensor however it came back 2 days later which really confused me since it completely fixed the issue for that period of time.
    The symptom seems like it’s always at the same “throttle pressure or close to, along with always happens while going up hill, next is 02 sensors and Another throttle body/tps since it seemed to have fixed it for a short time. anyone else able to chime in on this? Driving the truck is killing me at this point and with 2 years building my dream overland rig this has me to the point of just selling which I never want to do! I’ve been monitoring my fuel trims and when it happens I go negative -17 to + 17 about 3-4 times in about a 30 second period before it evens back out for a second then does it all over again.
    I see a lean and rich code but not a single emissions/tuner transmission shop or Toyota can find anything wrong even with the ST & LT fuel trims. Please help I’m completely over throwing money at this!!
     
  13. Mar 13, 2019 at 3:48 PM
    #13
    pye314

    pye314 Well-Known Member

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    Update;
    After 7 shops and months of diognosis and parts, I found it when no one else could, (Toyota, private shops and even Toyota specialty shops)
    OCV- oil control valve or “solenoid”
    They ohmed out correctly at 7.3 (refence is 6.9-7.9 however when testing I noticed the SMALLEST inconsistency, one of the ocv’s would close about .25mm further than the other. After replacing my truck is brand new!
    No codes what so ever and shops couldn’t “feel it” yet my wife easily could. My symptoms felt like I was towing momentarily or I was getting really strong resistance for about 2-5 seconds then it would stop and show full power then right back into power loss. It was originally only noticed under load or going uphill which got worse and worse. Yes oil and ALL fluids are meticulously maintained! Here is the link that lead me to a few others which then lead me to this thought and thus a fix- ocv controlls timing!!!!!!! Plain and simple.
    Thank you @tooter you don’t even know it but you saved me another 7 shops diagnostics fees and 6 more months trial and error. THANK YOU TW!! If anyone has questions feel free to ask and I’ll do my best to assist with parts I tried etc.
    https://www.tacomaworld.com/threads/p0022-help-please.329065/
     
    TnShooter likes this.
  14. Mar 13, 2019 at 4:48 PM
    #14
    Armkb

    Armkb Well-Known Member

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    Did you replace both OCV’s? Ive experienced similar symptons on occasion, as though it loses all throttle input for a second or two.
     
  15. Mar 14, 2019 at 12:40 PM
    #15
    pye314

    pye314 Well-Known Member

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    Yes I did both. Cost 125~ for both.
     
  16. Mar 14, 2019 at 5:27 PM
    #16
    Armkb

    Armkb Well-Known Member

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    Did you also clean the OCV filters on the sides of the engine. Not sure if they are in the front of the heads or the engine block.
     
  17. Mar 15, 2019 at 8:45 AM
    #17
    pye314

    pye314 Well-Known Member

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    Yup cleaned both. The one on passenger is pretty easy, driver side: remove batt & alternator, it’s on the drive side of block under the alternator. I could sent ya a pic of the one on the passenger side to give you an idea where to look. Just one bolt you pull out and the filter is inside the hole.
     
  18. Mar 15, 2019 at 9:42 AM
    #18
    Armkb

    Armkb Well-Known Member

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    Gonna attempt to inspect and clean mine soon. Did you find anything in the screens like sludge or oil particles?
    Use new washers?
     
  19. Mar 15, 2019 at 10:28 AM
    #19
    pye314

    pye314 Well-Known Member

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    I didn’t find anything in the screens, oil was dirtier in the screen than anywhere else. My washers were still so nice and new I re used them however I’d suggest having some on hand just in case.
     

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