Polaris MSX 150 - IFB - Page 2
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  1. #11
    PWCToday Newbie ripcuda's Avatar
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    Re: Polaris MSX 150 - IFB

    The System Interface Box (SIFB) is a mushroom shaped module that plugs into the wire harness above the battery... below the ECU. If you're having starting/stopping or rev limiting at 3400rpms... this is the likely culprit.

    Join all the MSX 150 owners over at Green Hulk.

    Cheers!

  2. #12
    Frequent Poster
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    Port Clinton, Ohio
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    Re: Polaris MSX 150 - IFB

    Found it. Thanks. I am working on this ski for a friend. He said he was flying along at 62 mph, made a turn and it bogged down and went into safe mode. He has to limp it back to the dock. I cleaned the MAP sensors even though they looked like new. The ski only has 114 hours on it. Not sure what else to try.
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  3. #13
    PWCToday Newbie
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    chatham, la
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    Re: Polaris MSX 150 - IFB

    I have a polaris 04 150msx turbo and tried the jumper white /blue to purple and tried to run the ski. come out of hole good but will not get above 4500 rpms and check engine light come on. I'm at wits end. Any help out there? Do you remove the module or leave it out. I left mine out and in but same thing happens.
    Last edited by caneylake; 07-04-2016 at 01:04 PM. Reason: left out questions

  4. #14
    PWCToday Newbie
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    Re: Polaris MSX 150 - IFB

    Looks like this is an old post... Anyone have a place to go to get some actual instructions, videos, or books?

  5. #15
    PWCToday Newbie ripcuda's Avatar
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    Re: Polaris MSX 150 - IFB

    Quote Originally Posted by Lwayneman1 View Post
    Looks like this is an old post... Anyone have a place to go to get some actual instructions, videos, or books?
    Welcome. Instructions, videos or books about??? the Polaris MSX 150? They are a rare, 1-year only craft from a manufacture that hasn't made pwc since 2004.
    Best source of Polaris knowledge... including the MSX 150 (and MSX 110... less hp version)... is GreenHulk (dot net).
    Also... see the links in my signature for some great, compiled Polaris knowledge webpages.

    Cheers!

  6. #16
    PWCToday Newbie
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    Re: Polaris MSX 150 - IFB

    I just acquired a 2004 MSX 150 that hasn't been run in over 2 years. It is in nice shape with 269hrs on it. I would think for a 4 stroke that is about 1/2 life. I am well experienced on Genesis Ficht as I have 2 of them that run great but that is a story right there. I know the MSX is a different animal but does share a few things from the Genesis. Fuel pump is one of them. The guy i purchased it from said it has two issues of won't rev above 3500rpm and won's shut off. So I assume the SIFB is shot. I have not bypassed it yet to see.

    Does the SIFB die in sections or completely? It seems on mine, they auto off works because in 2 minutes you hear clicking as stuff powering down and putting the ski in neutral it idles down and doesn't runaway with itself on the trailer.

    Has anybody successfully fixed a dead SIFB? It looks like a circuit board attached to a 8 pin Delphi connector submerged in a 1/2 inch of epoxy. Mine actually has a 100uF 16v can capacitor poking through the epoxy. This would be like digging ancient ruins so you didn't damage the circuit board with a Dremel. On mine anyway, the epoxy doesn't seem too hard as I started scrapping away with a screw driver.

    I never leave the lanyard in any of my skis so that function I don't care about. I am careful enough not to gun it while in reverse, however, I would like to be able to put it in neutral when trailer testing on the hose so it doesn't over rev. I was thinking of designing a circuit with a 555 timer and a couple gates. I could give all 3 functions back. I would need to think about how to disable the 2 min auto shutoff for DW.
    Last edited by waves; 10-14-2020 at 08:26 PM.

  7. #17
    PWCToday Newbie
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    Re: Polaris MSX 150 - IFB

    I see 2 broken transistors. This would make sense since it won't shut off and is stuck in Reverse limit.

    SIFB1.jpgSIFB2.jpgSIFB3.jpgSIFB-Back.jpg
    Last edited by waves; 10-15-2020 at 05:32 PM.

  8. #18
    PWCToday Newbie
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    Re: Polaris MSX 150 - IFB

    I have successfully fixed this module!!! Believe it or not, I robbed the transistors and a diode out of an old harddrive. I replaced the two broken transistors and resoldered in U1. I tested and the reverse limit worked again but it wouldn't start. There was zero volts on pin C. I then found a cracked protection diode off of pin C the Ignition line.

    Any ideas on sealing this again? I want it in a water proof box.

    If anybody has any dead ones of these, PM me and I will try and fix them.

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