Check Gas Cap Warning?
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Thread: Check Gas Cap Warning?

  1. #1
    crv|oc Rank: Freshman
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    Check Gas Cap Warning?

    I just got the "Check Gas Cap" warning on the maintenance minder screen.

    I'm sure I tightened the gas cap when I filled up a couple of days ago, but I tightened it again, just to be sure.

    Does the temperature of the air matter? - it was a warm 75 degree day today.

    Things that make me go Hmmm....

    (Among other things)

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  3. #2
    crv|oc Rank: Sophomore
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    The system monitors pressure changes in the gas tank. I won't go into all the gory details, but essentially it's looking for a "large" leak (.040"), then it'll look for a "small" leak (.020").

    Since temperature (and fuel volitility) can affect pressure, some times a "false" detection occurs.

    The monitor is a "two-trip" detection, meaning that it would have to detect failure on two separate trips before the MIL would illuminate, so in the old days, the first "fail" was silent = no indication.

    The second fail tripped the light, and pissed a lot of people off having to go to a service department to get the light diagnosed.

    Now, the first failure trips the "check cap" message so the operator has a chance to correct the condition before a hard DTC sets.

    The most important thing to remember (other than removing and re-installing the cap when the message first appears (don't just turn the cap a few more clicks, pull it off and put it back on), and making sure the cap tether isn't pinched beneath the cap) is that the monitor does not run every time you start the car, there are a number of enable criteria that have to be met before it can run.

    The "check cap" message means that, on that particular ignition cycle, the "large leak" monitor failed, and the test was suspended.

    You can keep getting the "check cap" message on every single succeeding ignition cycle UNTIL the monitor finally runs again.

    If it passes, the check cap message disappears. If it fails, the MIL will be illuminated.

    So don't get worked up about the check cap message if you keep seeing it for awhile - it'll either go away on it's own or the MIL will be lit up if a real issue with the EVAP system exists, but the "check cap" message is essentially meaningless after the first ignition cycle in which it illuminates.
    Last edited by Honda Tech; 05-30-2008 at 07:36 PM.
    Success is 99% failure
    -Soichiro Honda

    Success is the ability to go from one failure to another with no loss of enthusiasm.
    -Winston Churchill

    Motorcycle Riding in West Virginia

  4. #3
    crv|oc Rank: Freshman
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    Thumbs up Way Cool, Honda Tech

    I kinda thought it was a temorary thing, but I am not that experienced with the CRV and it's monitoring systems to be 100% sure.

    Your explanation was perfect.

    Thanks!

    Another quote I like from Churchill;
    "A lie gets halfway around the world before the truth has a chance to get it's pants on"

  5. #4
    Everything in Moderation Carbuff2's Avatar
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    Quote Originally Posted by GoGreen View Post
    I kinda thought it was a temporary thing, but I am not that experienced with the CRV and it's monitoring systems to be 100% sure.
    I've had the tether get stuck under the cap repeatedly on my '06, setting the Check Cap message. I finally cut the tether off, no problems since.



    Side note:

    I read where the emissions equipment on the new cars make siphoning gas very difficult.
    So now the thieves drill a hole in the plastic tank!
    Atwell "Buff" Haines
    '06 AWD CR-V, 5 speed MT!
    '07 Fit Sport, 5 speed MT!
    NJ

    In theory, there is no difference between Theory and Practice. In practice, there is. - Yogi Berra



  6. #5
    crv|oc Rank: Sophomore
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    Quote Originally Posted by GoGreen View Post
    Another quote I like from Churchill;
    "A lie gets halfway around the world before the truth has a chance to get it's pants on"
    One that always makes me laugh:

    Bessie Braddock: Mr Churchill, you are drunk.
    Winston Churchill: And you madam, are ugly. But I shall be sober tomorrow.
    Success is 99% failure
    -Soichiro Honda

    Success is the ability to go from one failure to another with no loss of enthusiasm.
    -Winston Churchill

    Motorcycle Riding in West Virginia

  7. #6
    crv|oc Rank: Freshman
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    Bessie Braddock: Mr Churchill, you are drunk.
    Winston Churchill: And you madam, are ugly. But I shall be sober tomorrow.

    Very funny!
    Touche' Mr Churchill.

    By the way, your advice was straight on - After reading your post, I unscrewed the gas cap and re-tightened it.

    As of this posting - my "Check Fuel Cap" warning is gone.

    Good to know for the future.

  8. #7
    Everything in Moderation Carbuff2's Avatar
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    How about this one:


    "When I got home from work, my wife demanded I take her someplace expensive.

    So I took her to the gas station!"

    <Rim Shot>
    Atwell "Buff" Haines
    '06 AWD CR-V, 5 speed MT!
    '07 Fit Sport, 5 speed MT!
    NJ

    In theory, there is no difference between Theory and Practice. In practice, there is. - Yogi Berra



  9. #8
    crv|oc Rank: Freshman
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    Ha!
    I'm diggin' it Carbuff2

    Will you be performing all week?

  10. #9
    Everything in Moderation Carbuff2's Avatar
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    Quote Originally Posted by GoGreen View Post
    Ha!
    I'm diggin' it Carbuff2

    Will you be performing all week?
    Sure! But I won't quit my day job.

    ::::::::::


    A recent study found the average American walks about 900 miles a year.

    Another study found Americans drink, on average, 22 gallons of alcohol a year.

    That means, on average, Americans get about 41 miles to the gallon.

    Kind of makes you proud to be American.
    Atwell "Buff" Haines
    '06 AWD CR-V, 5 speed MT!
    '07 Fit Sport, 5 speed MT!
    NJ

    In theory, there is no difference between Theory and Practice. In practice, there is. - Yogi Berra



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