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tire monitor beeping

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by nncyang, Apr 12, 2007.

  1. nncyang

    nncyang New Member

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    I just drove my 2007 Prius from the dealership last night. Before I left, I tried to get the maintenance people to pump my tires to 42/40 as suggested by many people in this forum, but they said the tire pressure monitor will beep since it is out of the recommended range. Is this true? Anyone else face this issue?

    thanks.
     
  2. subarutoo

    subarutoo New Member

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    I run my 06 at 40/38, and never had a beeper problem. I know the system works, since it senses a low tire that had picked up a nail at 9000 miles. I've heard that you should reset the system after uniformly increasing the pressures. I think you push the sensor reset button for several seconds until it resets. The sensor will light up when it sees a drop of 25% from normal after reset.
     
  3. jrfaris

    jrfaris Member

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    <div class='quotetop'>QUOTE(peachee @ Apr 12 2007, 11:30 AM) [snapback]422117[/snapback]</div>
    NO. They just said that to get rid of you. An indicator comes on if the pressure drops by 25% of the set value. You reset that value after filling all tires to the desired running pressure. Check the owners manual for reset instructions.
     
  4. JimN

    JimN Let the games begin!

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    <div class='quotetop'>QUOTE(peachee @ Apr 12 2007, 01:30 PM) [snapback]422117[/snapback]</div>
    You should have said, "Please show me." so they could come up with some other lame excuse to not do it.
     
  5. Bill Merchant

    Bill Merchant absit invidia

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    Hi again, peachee. You can set your tires to any pressure you want. Adding pressure won't set off the Tire Pressure Monitoring System. If you inflate your tires to 42/40, be sure to press the TPMS reset button under the steering wheel. The TPMS will signal you if it detects a 25% drop from the pressure it was reset to.

    So if the dealer set the pressure at 35 psi, the TPMS would signal at 27 psi. If you inflate to 42 psi but don't reset the TPMS, it will still signal you at 27 psi, a 35% drop. On the other hand, if you inflated to 50 psi, reset the TPMS, then delate to 42 psi, the TPMS would signal you when the pressure dropped to 37.5 psi, a 10% drop.

    Always be sure to adjust tire pressure on a cold tire, first thing in the morning before driving is best, and check your tire pressure regularly, don't wait for the TPMS to warn you.
     
  6. nncyang

    nncyang New Member

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    Very informative. And now I understand what the tire monitor really does. Thanks! :D