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Thread: Drive Cycle to Reset Emissions Computer

  1. #1
    Member HondaSUV Senior in training
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    Default Drive Cycle to Reset Emissions Computer

    My 2002 CRV did not pass a part of the emmission test called "Readiness'. The tech said that it would need to be driven 200 miles or so for the "drive-cycle" to reset. Does anyone know what the drive-cycle for a 2002 CRV is?

    Yes. I reset the code (erased) part with a diagnostic tool after changing the maintenance and checking the O2 sensors (P0420 error).
    2002 CR-V: 230,526 miles
    My best Honda ever: 1981 Accord LX 5 spd, 361,000 miles

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    Moderator HondaSUV Elder liquidfuel88's Avatar
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    30 miles of "spirited" and highway driving should be enough for any car to become ready for emissions testing.

    I deal with things like that at work all the time.
    David
    173,454 miles on 1/17/11 ---The End---



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  3. #3
    FFNC Site AdminHondaSUV Elder Racoon's Avatar
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    The problem is that you erased the code before going in for testing.
    The test can detect that.

    The Racoon

    White Diamond Pearl 2014 CR-V EX AWD (Gen 4)

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    Yes erasing rest the computer which their equipment can detect. I've heard of it only taking 5 miles or so but do thirty or so and you will be fine.

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    Member HondaSUV Senior in training
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    Thanks guys.
    2002 CR-V: 230,526 miles
    My best Honda ever: 1981 Accord LX 5 spd, 361,000 miles

  6. #6
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    sometimes, various conditions need to be be "learned" so that the ECU can be ready.

    emissions codes are like that...they not only require a certain amount of miles, but a certain number of starts, to become "ready".

    So you need to drive the car several times and many miles before you go through emissions.

  7. #7
    Senior Member HondaSUV Elder 'Curly Q Links''s Avatar
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    Quote Originally Posted by Carbuff2 View Post

    ...they not only require a certain amount of miles, but a certain number of starts, to become "ready".

    So you need to drive the car several times and many miles before you go through emissions.
    The service manual calls it 'trips' which means you start a cold engine, drive it until it's hot (fan cycles X times) and you shut it off until cool. That's one 'trip'.

    That's how OBDII decides whether a code is pending, or actual, as well.
    .
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  8. #8
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    Quote Originally Posted by 'Curly Q Links' View Post
    That's how OBDII decides whether a code is pending, or actual, as well.

    How does an error code become a "pending" code rather than an "actual" error?

    After a couple of weekend jaunts (yes jaunts). There are no error codes. Should the pending thing be a concern?

    On a related note: What should the oxygen sensor graph lines look like?
    2002 CR-V: 230,526 miles
    My best Honda ever: 1981 Accord LX 5 spd, 361,000 miles

  9. #9
    Senior Member HondaSUV Elder 'Curly Q Links''s Avatar
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    Quote Originally Posted by Georgia2002CRV View Post
    How does an error code become a "pending" code rather than an "actual" error?
    P0420, for example, the code isn't 'set' until the system sees the low performance of the cat (little difference between primary and secondary signal) for THREE 'trips' in a row. That's right out of the Gen 1 manual, page 11-128.

    The cat may be perfectly healthy, but the computer only goes by what it's shown.

    Suggest you SEARCH the word 'pending' to learn more... here or on Google.

    Quote Originally Posted by Georgia2002CRV View Post
    On a related note: What should the oxygen sensor graph lines look like?
    What device are you using for analysis? The sensors should go from peak to valley a few times a second once it's warm. That's why a worn-out 'lazy' sensor robs you of fuel mileage.

    .
    '97 CR-V. . . . . . '00 CR-V SE (leather) . . . '98 Odyssey V-Tec ! !
    --------------------
    First, read the Owner's Manual, then SEARCH, your Internet is STILL WAY faster than mine.
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  10. #10
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    Quote Originally Posted by 'Curly Q Links' View Post
    P0420, for example, the code isn't 'set' until the system sees the low performance of the cat (little difference between primary and secondary signal) for THREE 'trips' in a row. That's right out of the Gen 1 manual, page 11-128.

    The cat may be perfectly healthy, but the computer only goes by what it's shown.

    Suggest you SEARCH the word 'pending' to learn more... here or on Google.


    "What device are you using for analysis? The sensors should go from peak to valley a few times a second once it's warm. That's why a worn-out 'lazy' sensor robs you of fuel mileage.


    "That's how OBDII decides whether a code is pending, or actual, as well."
    Do not have a Gen 1 manual. It did not come with the vehicle.

    I understood your statement as meaning the OBDII would indicate an error was pending and the emissions computer would read the code. The vehicle would then fail the emissions test. That was the request for clarification.

    I pm'd the device website. Not affiliated with the site.

    The cat and the sensors were replaced two years ago.

    The redline was relatively flat and the green line was nicely wavy.
    Last edited by Georgia2002CRV; 08-17-2011 at 03:31 PM.
    2002 CR-V: 230,526 miles
    My best Honda ever: 1981 Accord LX 5 spd, 361,000 miles

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