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  1. #1
    Race, wreck, repeat delagem's Avatar
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    How to test a TPS sensor?

    I was putting my freshly powdercoated waterbar back in, and decided since I was in the engine bay anyways, to pop the TPS sensor and get some baseline readings with my Fluke Ohmmeter.

    Find ohms at idle, and at WOT, write them in my little notebook so that if I ever have a problem, I have some numbers to refer back to. Nothing currently wrong with the ski, it starts and revs up fine.

    But, contrary to other TPS sensors I've tested on cars, this one doesn't change resistance! Checked all 3 wires, there is resistance, but no change as the throttle is moved? How is this possible?

    Michael
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  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    The first generation Polaris Ficht TPS were a simple variable resistance potentiometer. These can be tested with an ohm-meter, and the output reading will change as the input shaft is rotated.

    Later TPS design use an analog Hall Effect sensor and moving magnet, and are actually a small electronic module. Feed it 5 volt power, and the output is a voltage proportional to the amount of rotation.

    The Hall Effect type can only be bench tested when powered up. Resistance measurements are just the un-powered electronics inside.

  3. #3
    Race, wreck, repeat delagem's Avatar
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    Good God, where did you learn all this stuff? Thanks for clearing up the mystery!

    I do have a laboratory power supply; so do I dial up 5v and connect positive to red, black to black, and check voltage across white to black using Fluke meter? How does that sound?

    And why the heck does Partsland.com now list the TPS as:

    1202768
    1
    OBSELETE PART NUMBER - NO LONGER AVAILABLE


    Michael

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    For the 2004 MSX140, Polaris lists the current TPS part number as 2202740.

    Also fits other Ficht models and years.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by delagem View Post
    ...I do have a laboratory power supply; so do I dial up 5v and connect positive to red, black to black, and check [the TPS output signal] voltage across white to black using Fluke meter?

    How does that sound?...
    Yep, that sounds about right.

    Current limit the 5 volt power source to maybe 100ma, that should be plenty of juice. Or use a low current fuse, just to be safe.

  6. #6
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    Go ahead and order a spare anyway, that way you have it to save a nice weekend or to use for a diagnostic test tool. I carry a spare on the ski with me and have changed one out standing on a river bank 60 miles from home.

    smoke

  7. #7
    I have just recently purchased a 2002 polaris genisis efi
    have had problems with lack of power and blowing grey smoke and very high fuel consumption.

    After lots of wasted time I found that the tps was seized in the fully open position.

    I removed the switch and cleaned rust of miled steel arm , yep, steel not stainless arm after lots of lube the switch freed up.

    Tested switch worked ok on the banch back in the water good for the day
    next week ski lost power again but not blowing smoke just not revving and no power back out of the water removed switch again
    found after suppling 5 volts to switch on the bench test
    the switch output centre wire at idle was in range of low volts about .05 volt.
    As you move the lever the output should increace to about 4.7 volts
    at about 85% throttle opening

    Problem was the longer I tested the switch the lower the output voltage became.

    The reason for this I found to be the corrosion in the switch created
    a high resistance therefore giving out low voltage ouput.

    I know now don't try to fix but throw away and replaced with new

    I need a new switch, would someone be able to help out?

  8. #8
    Watcon's Avatar
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    New "Take-off" TPS

    I have some new TPS that were from the Matrix builds.. $50.00 each. [email protected].
    Somebody buy K447 a beer for his technical support, as it's greatly appreciated!


    Thanks,
    Randy

  9. #9
    Bernie's Avatar
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    To test it ? No wrench ,Put it on your ski and ride it .If it operates properly you have your answer

    Bernie

  10. #10
    Race, wreck, repeat delagem's Avatar
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    Quote Originally Posted by Bernie View Post
    To test it ? No wrench ,Put it on your ski and ride it .If it operates properly you have your answer

    Bernie
    Spoken like a guy who has summer in January! Understand that it's not 80F and sunny here right now!

    Just wanted to get a reading when the TPS is good, so I could compare if I thought it was bad, that's all......

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