Question about Polaris ATV

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2006 polaris sportsman 450 tachometer will not work replaced tach, replaced ecm evrything in speedometerodometerhr. meter, etc, works but not the tach what does it read off of

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  • mechanic74 Apr 30, 2010

    thhis answer was another question, I rreally need help

  • mechanic74 Apr 30, 2010

    already changed the ecm right under the headlight fixed charging problem but not the tach, where is the tach triggered from?

  • mechanic74 Apr 30, 2010

    like to find someone who has seen this problem on this bike 06 polaris 450 sportsman

  • mechanic74 Apr 30, 2010

    The voltage was low 12.8, replaced ecm it came 13.5 + and climbing idling but the ecm I biought was bad in that the voltage went up but when bike was shut off and you walked away bike was still cold the fan would go to running on and off by it`s self until I came back out out and unplugged the ecm it had alreadu had the ecm upgrade done

  • mechanic74 Apr 30, 2010

    Oh yeah there is a rattling noise coming from under the flywhell cover aka pull ropee strter cover , had it off to fix bendix and did not see anything laying loose washed out and let dry with brakeclean.

  • mechanic74 Apr 30, 2010

    I have had others tell me that it may be triggered off the cdi any ideas

  • mechanic74 Apr 30, 2010

    06 polaris sports man 450 installed new speedometer assembly, not one on bike when I purchased it. Everything works but tach and fuel level, I realiae that fuel level is probably sending unit it reads full all the time, tach stays on zero always and it only charges at 12.7 volts at any rpm. Tried a used ecm fixed charging but it had other problems and the tach stayed on zero put old ecm back on low voltage came back and no results on tach

  • mechanic74 Apr 30, 2010

    Tach will not show anything changed ecm, fixed voltage problem but not tach, but fan kicks on and off with keu off so I put the old one in and we are going to order brand new ecm

  • mechanic74 May 01, 2010

    very helpful gsvr me some direction

  • mechanic74 May 01, 2010

    gave me a new direction to go in hope it works

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6 Answers

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From what i know about Polaris 4 wheelers is they have a lot of electrical problems. I have owned 5 of them in the past and what a great machine except some electrical problems here and there. The tach most likely goes dead on your Polaris because of a voltage issue believe it of not. When your 450 is running i want you to check charging voltage at the battery terminals. If you are reading anything under 14 volts then your stator is bad and you will need to replace it and your tach should work again. If it does not work your tach reads off your coils check all your connections from there back. Hope this can help you out!!!!

Posted on Apr 30, 2010

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  • Alex Apr 30, 2010

    replace that stator. That is the problem. Voltage was low and it probably ruined your ECM also. Most likely your ecm was never bad on your bike, they do not go bad often.

  • Alex May 01, 2010

    I just want to know why you are asking for assistance if you already think you know the answer. I have replaced so many stators that i cant even remember anymore. Why not try it, you will be very surprised of the outcome. Please help us all out with our ratings too we all try very hard to please everyone, be kind. Thank you

  • Alex May 02, 2010

    Let me know how it goes!!

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  • Master
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Hi, please your question is not clear enough,try to restate it and clearly descibe the problem,so you can get a comprehensive solutio

Thanks

Posted on Apr 30, 2010

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  • Polaris Master
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The tach gets it signal at the ignition coil as far as i can see from the parts book

Posted on Apr 30, 2010

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  • yadayada
    yadayada Apr 30, 2010

    see attached photo diagram, the #1 part is the coil, the tacj wire is the pigtail of the coil connector, the coil connector is the harness pointed at the coil in the picture, the harness comes from part #16 which is the CDI ignition module.




  • yadayada
    yadayada Apr 30, 2010

    if u have a hard time seeing the picture, right click it and save it to "My Pictures" then u can blow it it with the viewer

  • yadayada
    yadayada Apr 30, 2010

    did you even check the connector??? bet not.

  • yadayada
    yadayada Apr 30, 2010

    all tachs pick the signal up at the coil connector, bet u have a wire problem

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I would think, that it was a sensor problem,myself, usually a Tachometer, has a few ways to be made to work. First, and most obvious, is the "Cable Drive" attached usually, to a gear driven off the motor. The second way is Electrical, usually taken from the Points, or the "Coil" and basically "Counts" the "Pulses" from the "Points". The Third way, is by another type of electronic coupling, but this time is driven of a sensor that is attached to a shaft that is representative of "Speed" and it is either "Optically", "Hall Effect" or "Magnetically" activated, again, all the Tachometer does is, "Count" pulses, and the circuitry, is calibrated against that, to work out RPM, Usually, the Instrument itself, is, fairly "Bulletproof" In my experience, it is nearly always the "Sensor" or "Sender" that faults. Now in your case the Tachometer DOESN'T CONNECT DIRECTLY to the "Sensor". You see in between the "Sensor"and "Tachometer" is the EMU, (Engine Management Unit) One "Side" of the EMU, connects to our "INPUT" and another to the "Tachometer". So you need to find the sensor, and replace it, I am almost positive that will sort your problem. I searched for a repair manual, but could only find one for a 700, however, all in all they are the same, so use that, or better still buy, a manual, I found lots of pay for sites, for your exact model, and have it for future reference, they are invaluable.


http://pdftown.com/Polaris-Sportsman-700-2007-Maintenance-Manual.html
Above a Polaris 700 link, PDF, Below is a link for Polaris 400, 500, so have a look at them.
http://www.powersportresource.com/

Posted on Apr 30, 2010

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Hi, the problem may be linked with the computer, pop off your headlight housing and use a multimeter to follow the current of the tach wires. As you are doing that, take any connection apart and clean, you may have a frayed or loose and dirty connection..

Take care

Posted on Apr 30, 2010

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Prairie 650 that the guages won't show up on the LED screen. The neutral light comes on, as does the back light for night viewing when the lights are turned on, but there is no speedometer, odometer or fuel guage reading. The fuse is good. I have disconnected the battery and all connections, checked them and reattached again with no success. Other than the guages not appearing on the LED screed the ATV has no other issues. Any suggestions? I value your opinion. Thanks.

Posted on Apr 30, 2010

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