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I can't get my car to run. Please help!

Discussion in 'Gen 2 Prius Main Forum' started by Prius92, Aug 6, 2024 at 6:13 PM.

  1. Prius92

    Prius92 Member

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    2008 Prius
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    Got the hybrid battery done. Get everything installed and there are still throttle body error codes.

    They are:
    P0121
    P0122
    P0222
    P2135

    Which are:

    Throttle position sensor rationality.
    Difference between VTA1 and VTA2 voltages less than 0.8v, or more than 1.6v for more than 2 seconds.

    Throttle position sensor 1 low voltage.
    Output Voltage of VTA1 0.2v or less for 2 seconds or more.

    Throttle position sensor 2 low voltage.
    Output Voltage of VTA2 1.75v or less for 2 seconds or more.

    Throttle position sensor range check (correlation)
    Difference between VTA1 and VTA2 0.02v or less for 0.5 seconds or more.

    I went to the junkyard and got another complete throttle body, and it STILL does it.

    I checked for 5 volts at the TPS connector and it's there.

    My 12v battery is only 11.4 volts. Could a low battery be doing this?
     
    #1 Prius92, Aug 6, 2024 at 6:13 PM
  2. PriusCamper

    PriusCamper Senior Member

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    What kind of code reader are you using? Are you sure your code reader has a code library for hybrid vehicles? Some of these codes don't make sense?
     
    #2 PriusCamper, Aug 6, 2024 at 6:28 PM
  3. Tombukt2

    Tombukt2 Senior Member

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    Yeah you need to check your code reader and make sure that it's up to snuff and yes you need 12 volts really I mean some components will work down to 9 volts but which ones and all that who knows at least I don't.
     
    #3 Tombukt2, Aug 6, 2024 at 6:33 PM
  4. Tombukt2

    Tombukt2 Senior Member

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    When my throttle body did go bad in either Gen 2 or 3 I didn't have all these codes
     
    #4 Tombukt2, Aug 6, 2024 at 6:36 PM
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  5. Prius92

    Prius92 Member

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    Using a bluetooth code reader with the Dr. Prius App.
     
    #5 Prius92, Aug 6, 2024 at 6:59 PM
  6. PriusCamper

    PriusCamper Senior Member

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    That app has most of the codes, but not all of them... May try: "Car Scanner (ELM)" app to see if there's anything else and then we can work on the codes you do have some more.
     
    #6 PriusCamper, Aug 6, 2024 at 7:01 PM
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  7. PriusCamper

    PriusCamper Senior Member

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    Yeah... Same with me...
     
    #7 PriusCamper, Aug 6, 2024 at 7:05 PM
  8. Prius92

    Prius92 Member

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    After leaving the car off with the 12v disconnected for a couple hours, I still get 3 codes before even starting it.

    P0122, P0222, and P2135.

    But here's the kicker...I get these codes if the TPS is connected or not.

    I took ALL the plugs out of the computers behind the glove box to check for damage and did not see any.

    I checked the ground between the connector for the TPS and several ground points around the underhood and all were good. So it's well grounded.

    I plugged the TPS back in, and loaded the sensor data, the computer is seeing the TPS change if I manually rotate the throttle shaft.

    It also sees the accelerator pedal as well.

    The other weird thing? I accidentally disconnected the 12V battery with the ignition on and it was...still on. Does the traction battery kick in if the 12v is disconnected from ground?
     
    #8 Prius92, Aug 6, 2024 at 8:59 PM
  9. Tombukt2

    Tombukt2 Senior Member

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    If the car is on ready then the DC to DC converter is putting out output to the 12 volt to keep it charged but if you break the ground connection I would think that might mess up the 12 volt charging that should be going on but I'm not sure it wouldn't necessarily turn the whole car off but yeah maybe so I'll have to go out and try it if you break the 12 volt ground then pretty much everything that's 12 volt in the car should go off which is pretty much everything except orange cable things. Which there are not that many so you must not have broken the ground good enough or something
     
    #9 Tombukt2, Aug 6, 2024 at 9:25 PM
  10. PriusCamper

    PriusCamper Senior Member

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    The 12v is designed to power up all the systems and once the high voltage battery is on the 12v does nothing but sit there and get a near 14 volt trickle charge.

    I'm thinking you need to replace or fully charge the 12v battery because a weak 12v creates all kinds of malfunctions when it tries to power up all the car's systems with lower than the needed voltage.

    Also you haven't explained what the car's symptoms are beyond the error codes. Does the car shift into neutral at least? Does the car go into ready mode? Do you have specific warning lights? Or is the dash blank? We need all these details to tell you what to focus on next!

    And lastly, if none of the above works, I think something is wrong with whatever you mean by "got the hybrid battery done." Please clarify and maybe double check the 100+ connections that all have to be done right for it to truly be "done."
     
    #10 PriusCamper, Aug 6, 2024 at 9:35 PM
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