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One thing after another

Discussion in '1st Gen Tundras (2000-2006)' started by Moonminer, Dec 30, 2024.

  1. Dec 30, 2024 at 7:39 PM
    #1
    Moonminer

    Moonminer [OP] New Member

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    Okay so I bought a new TPS Toyota part 89452-30140 for my 2000 tundra SR5 access cab 4.7 2wd last week and installed it a couple of days ago. Now my truck either starts rpm’s go up to 2500 then bounce to 3000 then dies, or it goes up and down on the rpm’s to 2500 then to 1500 then back to 2500 to 1500 until I shut the truck off, OR it starts stays at a bit above 2000 rpm’s and stays idles until I shut it off only now will it turn the engine light on.
    I’ve done the reset of the computer by turn the key to on the off then on the off the on the third start it, I’ve tried to turn the key to on and depress the accelerator to the floor then back up. Nothing has worked. I’ve replaced all vacuum lines just to see if that was it. I’ve checked all fuses and even replaced some that looked burn but still intact. I’m at my wits end with my son’s truck, and need help. I don’t think a poor battery would make this happen the mad sensor is clean and no disconnected wires.
     
    Desert Dog likes this.
  2. Dec 30, 2024 at 8:07 PM
    #2
    JasonC.

    JasonC. ¯\_(ツ)_/¯

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    Where’d you buy that part? Dealer, online (and what website), etc.?
     
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  3. Dec 30, 2024 at 8:08 PM
    #3
    Desert Dog

    Desert Dog Nobody rides for free

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    How many miles have you driven it since replacement? Were you careful to not fluctuate the valve or let it retract quickly when replacing? They are very sensitive to these things. I would go through several stop-and-start periods and drive it as usual and see what happens.
     
  4. Dec 30, 2024 at 9:04 PM
    #4
    Moonminer

    Moonminer [OP] New Member

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    I can’t drive it. I just let it idle, and even then I don’t like to do that. I mean I stop disconnect the battery and retry starting. I have also tried to just restart it without disconnecting the battery for a day but same thing. Also when the truck is doing these things there is no throttle response, until I disconnect the battery and leave it disconnected for 5 to 10 min. I have not let the sensor slam back or the throttle body itself. I only buy my parts from a local Toyota dealer. I can adjust those toggle screws on the tps either way and it makes no change in the idle.
     
    Last edited: Dec 30, 2024
  5. Dec 30, 2024 at 10:22 PM
    #5
    Jdtuned

    Jdtuned New Member

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    No mods besides regular maintenance and up keep.
    How about checking all those vacuum lines? I remember I had a surging idle like that on my Honda civic and I found a vacuum line that was not connected. I doubt that’s what your issue is but maybe you have a loose line some where or incorrect sizing of those lines? Letting in too much air somewhere. Or do these trucks need to do a relearn by driving a certain amount of miles? Just throwing out some ideas.
     
  6. Dec 31, 2024 at 1:56 AM
    #6
    w666

    w666 D. None of the above

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    BroHon likes this.
  7. Dec 31, 2024 at 3:40 AM
    #7
    BroHon

    BroHon Everything's clock is ticking

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    No throttle response = limp mode.
    It's not happy with something it's reading/or not reading. Find the TPS calibration guide in the FSM and try that. You will need an OBD2 reader with live data to see what percentages % your throttle is at, and determine if idle and wide open are in spec. I would make sure it's all good and clean before calibrating too.
    What led you to replace the TPS?
    Any codes/check engine light?
    Was anything else worked on?
    What were the symptoms prior to TPS replacement?

    I had to learn how to do this calibration over several days... of trial and error. It's not fun, and the adjustments are so tiny. I also have had good luck relearning the idle by sitting in drive, brake on, engine warm, for a few minutes. Then after a couple drives it drops the last 100 or so rpms on idle.
    Just my experience, your mileage may vary.:notsure:
     
    Jack McCarthy likes this.
  8. Dec 31, 2024 at 5:57 AM
    #8
    Moonminer

    Moonminer [OP] New Member

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    And where can I find how to calibrate the tps in the factory service manual?
     
  9. Dec 31, 2024 at 6:24 AM
    #9
    KNABORES

    KNABORES Sarcasm incoming

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    Starting from the beginning, Why did you replace the TPS? What other work has been done recently? Are there any codes? Any known problems with the vehicle?
     
    BroHon likes this.
  10. Dec 31, 2024 at 6:26 AM
    #10
    w666

    w666 D. None of the above

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    The Black Mamba, BroHon and KNABORES like this.
  11. Dec 31, 2024 at 6:33 AM
    #11
    BroHon

    BroHon Everything's clock is ticking

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    Weight reduction, mostly rust.
    X3
     
  12. Dec 31, 2024 at 6:49 AM
    #12
    Moonminer

    Moonminer [OP] New Member

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    I replaced the upper plenum, starter, big 7 wiring, alternator, water pump, thermostat, and all hoses. I replaced the tps because the wire clip was broken off making the connector not lock in. I have a check engine light but I haven’t been able to scan because I can’t find my obd2 reader. I might buy a new throttle body from my Toyota dealer? AS I STATED IN PREVIOUS COMMENTS, I ONLY BUY TOYOTA PARTS FROM MY DEALER. The truck previous to this ran like a kitten with no codes at 258k miles!
     
  13. Dec 31, 2024 at 6:56 AM
    #13
    KNABORES

    KNABORES Sarcasm incoming

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    Don't buy anything else until you read that code. Do you still have the old TPS? Go back and check your re-install work. Why was the upper plenum replaced if it was running fine? Upper plenum leak of somekind could cause your problems.
     
  14. Dec 31, 2024 at 7:02 AM
    #14
    Moonminer

    Moonminer [OP] New Member

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    Like I said it was running fine up to the repairs. My upper plenum was cracked and that is what led me to replace it. I choose to upgrade the wiring and starter, and alternator cause my son is putting aftermarket lights, sound system etc. I checked the old tps but the connection clip is broken and is why I replaced it. I’ve checked, rechecked, and checked again my install and all checks out. My son helped me out, and I am not positive but I wonder if some how the butterfly was slammed shut or unseen not noticeable damage occurred when he cleaned the heavily soiled throttle body
     
  15. Dec 31, 2024 at 7:23 AM
    #15
    Mr Badwrench

    Mr Badwrench New Member

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    *If* you can locate a new throttle body and sensor through Toyota, get ready to spend $700+.

    Do you have an air intake temperature sensor?
     
  16. Dec 31, 2024 at 7:53 AM
    #16
    Moonminer

    Moonminer [OP] New Member

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    I don’t believe so, but I can get my new throttle body for just under 500 bucks, from my dealer.
     
  17. Dec 31, 2024 at 8:06 AM
    #17
    KNABORES

    KNABORES Sarcasm incoming

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    Check those codes first
     
    NickB_01TRD likes this.
  18. Dec 31, 2024 at 9:23 AM
    #18
    BroHon

    BroHon Everything's clock is ticking

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    Weight reduction, mostly rust.
    IAT is on the MAF. 00 4.7 AC
     
    FrenchToasty likes this.
  19. Jan 5, 2025 at 5:59 PM
    #19
    Moonminer

    Moonminer [OP] New Member

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    One code a P0120. I’ve replaced the tps 3 times with new parts from my Toyota dealer. Every single one of them makes the truck do the same thing stated earlier. Replaced with part number 89452-30140. I get no other codes. I get good voltage at sensor clip and good ground. I’m at a loss
     
  20. Jan 5, 2025 at 6:09 PM
    #20
    KNABORES

    KNABORES Sarcasm incoming

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  21. Jan 6, 2025 at 9:03 AM
    #21
    shifty`

    shifty` We skipped the light fandango

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    (see signature for truck info)
    Check the wires.

    Pop off the connectors and look in both ends.

    Is that the original engine to the truck? And original harness? I ask only because of the weird wire changes for throttle-related stuff between 00, 01, 02, 03. Helped a guy with that one this past year. Not the same code, but the wiring anomaly. Previous owner had swapped his engine with a newer year that required the donor engine's pinout.
     
  22. Jan 7, 2025 at 10:36 AM
    #22
    Moonminer

    Moonminer [OP] New Member

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    Original engine and the original harness. I had to re pin the tps harness because of brittle plastic connectors.

    IMG_2018.jpg
    IMG_2027.jpg
     
    ColoradoTJ and KNABORES like this.
  23. Jan 7, 2025 at 11:55 AM
    #23
    shifty`

    shifty` We skipped the light fandango

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    Ah, this again. And it started after re-pinning? You sure you got the pinning correct? Probably would've been better to keep this in your original thread so we had historical context....
     
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  24. Jan 7, 2025 at 12:29 PM
    #24
    BubbaW

    BubbaW Blessed 2 B above Ground

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    If you still have the TPS with the wire clip broken off, have you cosidered putting or have you put that TPS back on to see how truck reacts ?

    My main thought is that when you did all that work, did you cause any problem(loose connector, maladjust...etc) with the APPS(Accel Pos Sensor) on the opposite side of the TB from the TPS. It's almost sounds like it's got issues conveying back the ECU what accelerator pedal is doing which in turn talks to the TPS which is sensing the position of the throttle butterfly and gives feedback to the ECU so that it can control the throttle butterfly position precisely....round and round they go.

    If you haven't made any voltage checks of the TPS, one you could do is by turning key to IGN ON only, unplugging the TPS and look at the conductors going back to the ECM....in particular pin 1 Grn/Blk(VC) and pin 4 Grn/Wh(E2) checking for 4.5/5.5 vdc
    Do you feel confident you got the color match right after your thread from 3 wks ago ?

    Throttle body cable harness | Toyota Tundra Forum

    2000 AC TBS T 2.jpg

    ....Forgot to add the TPS adjust procedure from 2000 FSM. You'll note in that procedure a scan tool that reads live data, in particular "THROTTLE POS", is almost an imperative. If you don't have live data scan tool, some places like O'reillys, Autozone etc let you buy/rent scan tool.
     

    Attached Files:

    Last edited: Jan 7, 2025
    Mustanley, shifty`, bmf4069 and 2 others like this.
  25. Jan 7, 2025 at 3:20 PM
    #25
    Moonminer

    Moonminer [OP] New Member

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    Yes I have pined everything correctly and it voltage test confirmed. I have noticed if I take off the air filter hose and just place it around the throttle body it idles better but still chugging. If I take it completely off the truck dies. Soon as I reinstall the air filter hose it goes back to steady high idle or up and down idle. I have a buddy that has the same truck as I do and is going to bring me his throttle body to try it out. I’m at a loss. I really wish I had the original connector that connected the main harness to the tps wire harness. UGH!!
     
  26. Jan 8, 2025 at 10:12 AM
    #26
    Moonminer

    Moonminer [OP] New Member

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    This is what my reader says. Truck running

    IMG_2138.jpg
     
  27. Jan 8, 2025 at 11:33 AM
    #27
    BubbaW

    BubbaW Blessed 2 B above Ground

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    what was rpm when MAF was showing 14.05 g/s….at idle, our 1st Gens should be about 2 to 7 g/s and 15-26 g/s @2500 RPM, some even say close to 4.7…the 33.8 F should not be an issue.

    Clean air filter ?

    Also, were those readings @ operating temp
     
    Last edited: Jan 8, 2025
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  28. Jan 8, 2025 at 11:45 AM
    #28
    Moonminer

    Moonminer [OP] New Member

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    My truck is not idling like it should. Right now it idles up and down goes up to about 4500 then down to 1500 then back up then down to zero then back up then back to 2800. If I take the air cleaner hose off the throttle body it gets to be a steady idle, if I take it completely off the throttle body it dies. Brand new air filter, even took off the hoses to see if I messed those up. Where are you getting the 33.8 F? Those readings were after the truck idles for 10 min.
     
  29. Jan 8, 2025 at 12:08 PM
    #29
    BubbaW

    BubbaW Blessed 2 B above Ground

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    It appears your reader is set for CEL and your reader says 1….1 deg CEL is 33.8 deg F for your IAT reading

    IMG_5885.jpg
     
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  30. Jan 8, 2025 at 1:12 PM
    #30
    Moonminer

    Moonminer [OP] New Member

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    Holy F. I’m an idiot! Thank you
     
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