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Thread: mfd lopr

  1. #1

    Join Date
    Mar 2007
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    mpls,mn
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    mfd lopr

    1996 slx the mfd is reading low power. i checked the battery before charging it was 12v so i charged it anyway. now reading 12.8 volts. My first thought when it read low power was to clean the battery terminals and check tightness. after charging battery and cleaning terminals well, it still read low. I removed the handle bar pad unplugged the mfd and checked voltage from red/pur to black and got my 12.8 plugged the mfd in and still reads low. I then unplugged it again let sit a few mins and tried again still reads low? i dont know how it can be low with the 12.8 right at the plug. I once again ask the polaris gurus for some help thanks ahead of time


  2. #2

    Join Date
    Mar 2007
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    mpls,mn
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    38
    took out the mfd out of my sl 900 and put on the slx it reads fine so.... something is wrong with my mfd on the slx it will only read .5 volts.

  3. #3
    ph2ocraft's Avatar
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    Apr 2006
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    Never replace the 1/4 amp fuse with one of a higher rating. You will cause irreparable damage to the MFD if something goes wrong.

    Power surges or spikes are the most common cause for a blown fuse.
    The power surges can be caused by loose connections in the electrical box (remove and re-crimp all connectors, I'd also replace the board as it's so inexpensive). Poor ground at the engine plate (scrape off the paint and clean the connector), even corroded or loose battery connections will cause this issue (remove and clean the connections).
    Anytime the charging path is interrupted there's a potential for a voltage spike.
    I think 14.1 is to much charging output, check the actual value with a "GOOD" meter (Fluke comes to mind) and make sure of the voltage being charged to the battery.
    When you split the box, it's also not a bad idea to replace the voltage regulator.

    While on the subject of MFD's and LOPr.

    The LOPr will only come on when the battery voltage is under 10.9
    Remember power fluctuations (usually caused by loose connections) or electrical noise caused by the ignition system may cause the MFD to lose voltage calibration data. These "events" will also show LOPr.

    Check and correct the charging system, battery, battery connections, fuse connections, MFD pin connectors, (pay particular attention to power and ground connections at the MFD).

    To re-set the MFD
    Press and hold the MODE and SET keys until the CAL displays. The CAL display will usually show after 4 seconds
    Press and hold the SET key
    While continuing to hold the SET key ans within 2 seconds of pressing the SET key, press and hold the MODE key
    Don't release either key until the MFD shuts down
    After the MFD has shut itself down, press the mode key to turn the MFD on
    Depress the MODE key repeatedly until voltage is displayed and verify that the voltage reading has been restored.

    Display is stuck one one function/display shows all 8's/buttons don't work

    This malfunction can occur when the battery has been disconnected or removed.
    It may freeze on any function, or with all 8's the MFD is running its self check during power up.
    This will usually happen when there is a power glitch and the micro-processor temporarily malfunctions.
    It will usually correct itself when you disconnect the battery for a few minutes, it usually takes 2-3 minutes to re-set the micro-processor.

    When connecting the battery negative cable, make sure it is a "clean connection. Meaning only let the terminal contact the battery once. DON'T repeatedly contact the battery!! Hold pressure on the cable until the bolt is tight.

    If you have problems connecting the battery terminals you can disconnect the MFD, install the cables and then plug the MFD back in (my recommendation).

  4. #4

    Join Date
    Mar 2007
    Location
    mpls,mn
    Posts
    38
    ph2o yeah after scouring the site i found your previous post on mfd troubleshooting I reset the mfd and ho ray! it works reads 12.9 but whos counting! i couldnt wait for your post so i went searching and found my answer from you anyway! thanks a mill.

  5. #5
    Quote Originally Posted by ph2ocraft View Post
    Never replace the 1/4 amp fuse with one of a higher rating. You will cause irreparable damage to the MFD if something goes wrong.

    Power surges or spikes are the most common cause for a blown fuse.
    The power surges can be caused by loose connections in the electrical box (remove and re-crimp all connectors, I'd also replace the board as it's so inexpensive). Poor ground at the engine plate (scrape off the paint and clean the connector), even corroded or loose battery connections will cause this issue (remove and clean the connections).
    Anytime the charging path is interrupted there's a potential for a voltage spike.
    I think 14.1 is to much charging output, check the actual value with a "GOOD" meter (Fluke comes to mind) and make sure of the voltage being charged to the battery.
    When you split the box, it's also not a bad idea to replace the voltage regulator.

    While on the subject of MFD's and LOPr.

    The LOPr will only come on when the battery voltage is under 10.9
    Remember power fluctuations (usually caused by loose connections) or electrical noise caused by the ignition system may cause the MFD to lose voltage calibration data. These "events" will also show LOPr.

    Check and correct the charging system, battery, battery connections, fuse connections, MFD pin connectors, (pay particular attention to power and ground connections at the MFD).

    To re-set the MFD
    Press and hold the MODE and SET keys until the CAL displays. The CAL display will usually show after 4 seconds
    Press and hold the SET key
    While continuing to hold the SET key ans within 2 seconds of pressing the SET key, press and hold the MODE key
    Don't release either key until the MFD shuts down
    After the MFD has shut itself down, press the mode key to turn the MFD on
    Depress the MODE key repeatedly until voltage is displayed and verify that the voltage reading has been restored.

    Display is stuck one one function/display shows all 8's/buttons don't work

    This malfunction can occur when the battery has been disconnected or removed.
    It may freeze on any function, or with all 8's the MFD is running its self check during power up.
    This will usually happen when there is a power glitch and the micro-processor temporarily malfunctions.
    It will usually correct itself when you disconnect the battery for a few minutes, it usually takes 2-3 minutes to re-set the micro-processor.

    When connecting the battery negative cable, make sure it is a "clean connection. Meaning only let the terminal contact the battery once. DON'T repeatedly contact the battery!! Hold pressure on the cable until the bolt is tight.

    If you have problems connecting the battery terminals you can disconnect the MFD, install the cables and then plug the MFD back in (my recommendation).
    Yes I know this is an old post but wanted to say thanks. Had the LOPOR issue on my 95 SLT after a battery change and resetting the MFD corrected the issue.

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