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Thread: Engine Code P1698, what does this mean?

  1. #1
    1st Gen MR2 Owner iceman34572's Avatar
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    Post Engine Code P1698, what does this mean?

    OK, so I bring my car into Autozone, and they scan my computer (CEL is on).
    It came up with code P1698

    Here is the description from their computer;

    Definition: ECM fault-No CCD message from TCM

    Explanation: Failed ECM

    Probable Causes

    1. Open CCD bus line
    2. Failed TCM

    What does that mean? The car is misfiring noticeably. I'm at a loss as to what is causing the problem. Any help, as always, is greatly appreciated. Thanks!

  2. #2
    2 Treps Are Better Than 1 Dodgaholic's Avatar
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    From that description, either the Transmission Control Module is bad, or the engine Control Module is bad. Noticeable misfiring as you say, seems to point to the ECM being the one with the problem.



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  3. #3
    1st Gen MR2 Owner iceman34572's Avatar
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    Quote Originally Posted by Dodgaholic View Post
    From that description, either the Transmission Control Module is bad, or the engine Control Module is bad. Noticeable misfiring as you say, seems to point to the ECM being the one with the problem.
    The transmission seems to shift fine, so I'm thinking ECM as well.
    Is that a common thing to go out on these?
    Am I better off buying one on Ebay, or one from the boneyard?
    Thanks for your quick answer

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    Devilish Eagle EagleESi's Avatar
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    Just throwing htis out there, the misfire may be from something else. Nowe this may be the type of code that is hard set, aka it scould of messed up long time ago but now working fine.

    But I don't see the tcm having anything to deal with a misfire.

    Unless the told you TCM when it is suppose to be PCM.
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  5. #5
    1st Gen MR2 Owner iceman34572's Avatar
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    Quote Originally Posted by EagleESi View Post
    Just throwing htis out there, the misfire may be from something else. Nowe this may be the type of code that is hard set, aka it scould of messed up long time ago but now working fine.

    But I don't see the tcm having anything to deal with a misfire.

    Unless the told you TCM when it is suppose to be PCM.
    So it could be a code that wasn't deleted once the problem was fixed........now that I think of it, the guy I bought it from said that the car had a problem in which it would die out in the middle of driving and not restart. He said something about a wire being replaced (I kid you not, those were his exact words). When I tried to get more information out of him, it was like asking a politician to give a straight answer. The guy really didn't know much about cars.

    Just to be sure, maybe I should have the code reset, and then drive the car. If it comes back again, I'll know for sure it's a reoccurring problem.
    I'm thinking that it's time that I do a visual inspection of the spark plugs as well.

    I'm also wondering if the motor or trans was ever gone through. Transmission shifts great, doesn't hunt for gears, and doesn't make any noise. The motor, aside from the noticeable misfire, doesn't knock, burn any oil, or leak any fluids. I mean the thing has 153,400 miles on it.

  6. #6
    pimpin on a budget DrDodge's Avatar
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    after checking indetifix, you may want to check the ignition switch, and the dash cluster,
    p1698 no bus message from the tcm,,,

  7. #7
    1st Gen MR2 Owner iceman34572's Avatar
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    Just wanted to give you guys an update on the car; the check engine code was from the previous owner. They had a harness replaced, and the person that did the work never cleared the code out of the system. My misfire turned out to be intake manifold gasket, which luckily, isn't that hard to do (as long as the bolts don't snap), and the gaskets are only $7.99 through autozone.

    Once I do that and fix my HVAC controls, the car will be in proper running order.

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