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tire pressure monitor 101

Discussion in 'Wheels & Tires' started by gvidas, Apr 22, 2009.

  1. Apr 22, 2009 at 2:59 PM
    #1
    gvidas

    gvidas [OP] Member

    Joined:
    May 19, 2008
    Member:
    #6731
    Messages:
    20
    Gender:
    Male
    western NY & coastal oregon
    Vehicle:
    essentially stock trd sport
    stock
    Just got back from 30k service at a dealership. ~50mi away from their shop, my tire pressure light starts blinking. Five more miles and it goes on steady. It had been on for a while before I went in for the regular service, and I had assumed one of them was de-synchronized or whatever because I had to replace a sensor after splitting a valve stem trying to get the chrome caps off during the winter.

    So, my questions are:

    - What does the tire pressure light actually mean? Is it comparing current pressure to a set standard, or some relative change off a calibration point, or is it just saying "one tire is much lower than the rest"?

    - What's the margin of acceptable variance from tire to tire? I bought an old fashioned dial indicator and it showed ~3-4psi difference between all the tires (this at about 70mi away from the dealership.)

    - Previously, I've re-inflated tires and not seen the indicator light go off. How is this thing meant to be used? Can I just disable it and be proactive about tire pressure? It mostly seems to make me lazier, all "oh well, it's blinking now, whatever; it did that for a while before, too." Another latent bit of guilt, all oh hey another dash light is on.

    Thanks.

    (edit: 2007 4wd accesscab v6)
     
  2. Apr 22, 2009 at 4:53 PM
    #2
    bajamoon

    bajamoon Well-Known Member

    Joined:
    Feb 3, 2009
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    First Name:
    STEVE
    Whittier
    first, did you check your spare tire, and did you push the button down below the steering wheel, that will reset the monitor. I think the light will go on with a vairience of 5 psi. I would check your spare then push the button below the dash, it's next to the hood release. It's going to blink everytime you start the car, just put a black piece of electrical tape over that light like i did.
     
  3. Apr 23, 2009 at 4:21 AM
    #3
    FoxySandChick

    FoxySandChick Well-Known Member

    Joined:
    Sep 27, 2008
    Member:
    #9505
    Messages:
    2,963
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    Female
    First Name:
    Kristin
    Henderson, NV
    Vehicle:
    07 DC 4x4 Base model V6 Impulse Red Pearl
    De-badged, limo tint, black wet okole's, weathertechs, extra d-rings, TSB bilsteins
    Also...
    http://www.tacomaworld.com/forum/technical-chat/20315-disconnecting-tpms.html

    Can someone else clarify...flashing tpms=problem with a sensor?
    :cool: Hope this helps and I'm sure others will chime in.

    Edit: checked the owners manual....and blinking tpms light means there is a problem with the system which would need to be checked at the dealer.
    Page 164 in my manual....under the section that explains all the dash warning lights.
     
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