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Thread: weird tps voltage problem

  1. #1

    Default weird tps voltage problem

    So here is the story. i own a 1989 toyota supra turbo. the problem i am having is the voltage at idl and e2 at the ecu. When i probe these leads i get 10 volts instead of the 4-6 that toyota calls for. when i unplug the ect for the transmission the voltage across idl and e2 drops to 5.2v. this is where it is supposed to be. Anyone know what the problem may be.????? please someone help i am ripping my hair out wondering where the problem may lay. thanks

  2. #2

    Default Re: weird tps voltage problem

    Anyone?????

  3. #3
    Dang Dude! No Way Man.
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    Default Re: weird tps voltage problem

    What are you trying to figure out? What's the problem the car is making?

  4. #4

    Default Re: weird tps voltage problem

    the voltage in the manual which states to test the computer for problems should be 4-6v at ecu pins but im getting 10 volts. when i unplug the ect ecu the voltage between idl and e2 goes to 5v. it seems there may be something wrong with the ect computer. The car is running rich. the wideband reads 12 and before i took the manifold off to repair the block the afr was 14.7. everything is hooked back up and the knock sensors were rewired with shielded wire. tps adjusted to spec. i did have the battery disconnected for a couple days. does the computer take time to relearn? if so how long does it take? should not take to long. Thanks

  5. #5
    creepy-ass cracka
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    Default Re: weird tps voltage problem

    What makes you think that particular problem has anything to do with the car running rich?
    In memory of Rimma Kiselitsa

  6. #6

    Default Re: weird tps voltage problem

    i was just wondering because it has to do with the tps. i was just curious. i know its not the reason the car is running rich. the computer needs to relearn the fuel map since the battery was disconnected for such a long time. i think at least. from what i have been hearing. is this correct.

  7. #7
    creepy-ass cracka
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    Default Re: weird tps voltage problem

    No, it's not correct. Do you think these cars run that rich every time the battery is disconnected? Do you think the factory had to "teach" each one after they built it?

    I was just wondering since you seemed to be implying the TPS has something to do with the problems you are having. I mean, that's the question you were asked wasn't it?
    In memory of Rimma Kiselitsa

  8. #8

    Default Re: weird tps voltage problem

    this is what i found quote by quote

    "think I finally found an answer to this: ~20min

    from: http://alflash.narod.ru/vf1.htm

    For the ECM to relearn the value, the vehicle must be driven in closed-loop, feedback operation for a certain amount of time. The amount of time will vary depending on the engine and the type of conditions the vehicle is driven in.
    If memory is lost for D-type systems, it may take up to 20 minutes for strategy to be re-learned, depending upon altitude. Airflow meter types are able to relearn faster."

    thats what i found on reading different forums

  9. #9
    Grumpy Old Man
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    Default Re: weird tps voltage problem

    It only "relearns" the fuel trims, it has a base map or it wouldn't run at all.

  10. #10

    Default Re: weird tps voltage problem

    so would that make it run a little rich until it learns the fuel trims?

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