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  1. #1
    Seaman Apprentice
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    Apr 2010
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    Default Mercruiser 5.7 MPI - Check Engine Code Reset

    Hey all,

    Been a frequent lurker on this forum but thought I would ask my first question. I have a 2002 Mercruiser 5.7L MPI Horizon engine. I've recently installed a new Mercmonitor onboard to provide engine monitoring data. First thing I've noticed after the installation, is that the unit is reporting a "check engine" alarm. Because the engine is the older generation, the Mercmonitor does not provide the detailed text description of the engine fault.

    I *think* this check engine code is related to an alternator failure I had recently. Alternator packed it in and ran the battery down before I could get back to the dock. I think the code is a "low voltage" code that has been stored and needs to be reset.

    Is there any way to manually reset the code without having to take the boat to a service location? All engine gauges report normal -- no alarms and the boat is running 100% now that the alternator has been fixed.

  2. #2

    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    You will want to call rinda technologies and talk to them about the codemate tool they have for sale, Even though it's been a while now since I have seen this tool, I believe this tool also clears codes. (Not sure on that right now) But worth a call to find out. The guys at rinda technologies are very nice and helpful.

    http://www.rinda.com/marine/marine.htm

    Also if the problem has been fixed, Then normaly the ECM will clear it's self after a certain amount of key ups, The rinda guys may know a little more about how many key ups it takes, That is if no one else chimes in here that may remember how many key ups it is for this engine.
    Hope this helps, Good luck with it.

  3. #3
    Moderator Bondo's Avatar
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Ayuh,... I donno about Merc's 'puters, but like About Any other 'puter,...
    Unhook the Power for a few minutes will clear codes...
    Any Grease is Better,..... Than No Grease at All.......

  4. #4
    Seaman Apprentice
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Thanks for the link. I've looked at the Rinda tool before. I don't think the codemate can actually reset the code -- it just provides the flashing lights that lets you read the code detail. I have sent them an email to see if they might have a consumer grade version of their PC tool available to allow users to read codes. I've seen this tool priced in the past and I think it's close to $800 which is a little steep for a weekend warrior.

    I did try disconnecting the battery for >1hr and it didn't remove the code. Someone had mentioned to me in another forum that the 555 ECU will store the fault until it's cleared.

    Then again, this check engine code may be an active code. I've now restarted the boat probably 30-40 times since replacing the alternator so I'd guess the code would have cleared by then if it does it via key-ons.

  5. #5
    Honorary Moderator Emeritus Don S's Avatar
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    Western WA.
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    You don't need all the fancy software for a laptop and all that goes with it.
    The scan tool can tell you everything you need to know, and do all the tests at half the price, and you can read it when the suns out.

    http://www.rinda.com/marine/marine.htm

    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  6. #6
    Seaman Apprentice
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Thanks. I've confirmed that the Code Mate will not work:

    Compatible with MEFI-1 thru MEFI-4 marine
    EFI systems. CodeMate serves as an EFI fault
    code indicator and a base timing service tool.
    CodeMate flashes fault code sequences on its
    built-in malfunction indicator lamp and also
    allows base spark advance to be set when used
    with a timing light.

    This tool is not for use with MEFI-5,
    MerCruiser PCM-555, ECM-555, Volvo EGC
    or other marine EFI systems.


    The Rinda tools look very good, but they are priced beyond what I'd consider a limited use type of application. The handheld tool is $399 (plus $40 for an adapter) -- or their PC software/cable is $570. Easier to swallow for a shop that would get more use out of it -- but I'm thinking this is the sort of tool I'd use 1-2x per year max.

    Looks like OBD Diagnostics has a Scan tool that is PC based at $195 -- I've written them to find out if this tool can reset codes and will see what they say.

  7. #7
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Looks like OBD Diagnostics has a Scan tool that is PC based at $195
    They do not work on marine engines. Rinda is the only ones that I know of that makes diagnostic tools for marine applications.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  8. #8

    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Below is some information about Sticky and non sticky faults.

    All faults are classified as either Sticky or non-Sticky.

    Sticky means that the fault, once set, will continue to show up as active, even if the circuit or problem has corrected itself. A key switch cycle is required to reset a Sticky fault.

    A non-Sticky fault is a fault that will change it's status from active to inactive without requiring a key switch cycle.

    The CDS diagnostic tool will continue to display a Sticky fault as active even though the cause of the fault has been corrected. Cycle the Key to reset all faults if there is difficulty correcting a fault.

    Also here is one other way that I found that might clear up a fault that you could try out if you would like to, See Note below.

    NOTE: On models with the trim with key off feature, The control handle must be placed in full reverse "WOT" after cycling the key switch to reset a sticky fault.



    (FYI) I was kind of right, Because if you would have had an older engine that uses the MEFI-1 thru MEFI-4 marine EFI systems, Then the information below is how you would be able to do it with the CodeMate tool.

    CLEARING CODES USING DIAGNOSTIC CODE
    TOOL (NON-SCAN)
    1. Install diagnostic code tool.
    2. Turn key ON.
    3. Select service mode on code tool.
    4. To clear codes, move the throttle, while in neutral,
    from 0% to 100% then back to 0%.
    5. Exit “Service Mode” on code tool.
    6. Start engine and let run for fifteen seconds.
    7. Turn key OFF for 5 seconds.
    8. Select “Service Mode” on code tool.
    9. Turn key ON and read codes. If codes are still
    present, check note following and repeat from
    Step 1.
    10. Refer to appropriate Troubleshooting and/or
    Diagnostic Charts
    A poorly charged battery or engine cranking problem
    may result in an ECM “reset” and may not allow
    stored trouble codes to be cleared from EEPROM
    memory. If this condition exists, BE SURE the battery
    is fully charged.
    NOTE: If a low battery condition does exists the audio
    warning buzzer will come on for 2 seconds after
    engine start-up.

  9. #9
    Seaman Apprentice
    Join Date
    Apr 2010
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    Default Re: Mercruiser 5.7 MPI - Check Engine Code Reset

    Got it cleared today by a local tech with his laptop tool. The Check Engine code was indeed left over from when my alternator packed it in. The Engine Guardian had kicked in so the actual code was an Over-Rev code (actual engine RPM was only 2900 at the time). Good to know it was nothing serious -- everything else checked out fine.

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