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  1. CDI vs ECU - what's the difference?

    ATV Repair and Maintenance
    It has recently come to my attention that certain Polaris vehicles with claimed Capacitive Discharge Ignition (CDI) actually has Electronically Controlled Inductive Discharge Ignition (ECM or ECU unit). From Wikipedia: As ignition technology developed, engineers realized that a functional...
  2. 05 magnum 330 fan won't shut off/hot light on

    ATV New Members
    Hello, I have a 05 Magnum 330 4x4 that the fan won't shut off even with key off and the hot engine warning is on even though it hasn't ran in a couple days. ...I bought the machine off of a friend who said he just had the ecm replaced and it was running fine when I bought it...I don't use it...
  3. Stator short to ground, 06 sportsman 450

    ATV Repair and Maintenance
    Ok, been having overcharge issue for a couple weeks now. I bought new ecm thinking it was voltage regulator as battery was metering at 16-18 volts at 3000-4000 rpm. After new ecm (regulator is built in on this model year), same overcharge issue. I tested stator legs and they are ALL showing a...
  4. Overcharge issue... PLEASE HELP

    ATV Repair and Maintenance
    I'm at my wits end... I have 06 sportsman 450. Battery light flashing so I put on volt meter and getting overcharge (up to 18v @3000 rpm). I have new battery in it and just replaced ecm today. Put in new ecm and SAME DAMN THING! If i put on lights it brings voltage down to 12+, likely...
  5. 06 Sportsman ECM/ Rectifier question

    ATV Repair and Maintenance
    I have recently acquired a 2006 Sportsman 450. The ECM was replaced on recall in August 2015 (previous owner, confirmed by dealer). As luck would have the NEW one also crapped out. The internal voltage regulator, inside the ecm of course, is not working and battery over charges to 18V at 3000...
  6. 07 Sportsman EFI hot light and fan come on at start

    ATV Repair and Maintenance
    So I just bought an ATV and the check engine/hot light come on at start up and the fan kicks on right away. The guy I bought it from says that he has replaced the ECM before and is convinced that if I do it will fix the problem. Any thoughts? Thanks
  7. Rev Limiter problem? maybe?

    ATV Repair and Maintenance
    Hey all, been a while since I posted last. I was riding up in Jericho Mountain state park in Northern NH over Memorial Day weekend and my 05 sportsman 400 start to act like it was boggin down... but it wasn't bogging per say... it had no problem getting to a certain point in RPM's (can't...
  8. 2006 sportsman 500 ho efi not wanting to start.

    ATV Repair and Maintenance
    Hello. I have a 2006 polaris sportsman 500 ho efi and it died on me a few days back. Once I got it in my shop I found that when I would turn the key on nothing would happen. I put a charger on it and still nothing. I pulled the plastics off it and was checking voltage and found that I have...
  9. 2010 Sportsman 500 won't start

    ATV Repair and Maintenance
    I was out riding and everything was fine. I stopped and turn quad off. When I went to start back up nothing worked. No lights, no power to dash lights/speedo, no power to starter. When i turn the key to start the machine nothing happens. The positive battery terminal got hot and the main fuse in...
  10. Charging problems on sportsman 500 efi-06

    ATV Repair and Maintenance
    Hello! I have some problems with my atv, its not charging enough, at idle it is about 12.2 and 3000-4000 rpm its about 12.6... and the battery is ok and the stator is ok, i have used a multimeter to check it. But the strange part is that no battery lamp is flashing? And i think it works, its...
  11. Need some help!

    ATV New Members
    Hello everyone, I am in need of an ecm module for a 2007 Polaris trail boss 330 if anyone has one for sale please contact me or is it unwise to buy a used one since it is an electrical component? I live in California and am planning to go on a trip in February to ride around in the mud, thanks...
  12. No ground at pin 70 on the "Start Selenoid Relay"

    ATV Repair and Maintenance
    Is there any other "Sensors" or "Switches" that makes the ECM (#4012616 ECU) spit out ground from pin -6- (E70)??? A few months back I started having problems starting my Sportsman 850 xp eps 2010. When turning the key to "Start" it would go "Click, Click, Click" but nothing else... but not...
  13. 2007 sportsman starting issue pdm? ecm?

    Polaris Sportsman
    hello guys, im new to the site and joined for this issue, My 2007 Polaris sportsman 500 X2 has a starting problem. when i turn the key (with the kill switch in the run position) nothing happens, but it will ocassionally click (efi) and the dash lishts will flash. with the key on, i cant turn on...
  14. Sportman 500, charging problem again

    ATV Repair and Maintenance
    I have a 2007,sportsman 500 black stealth ed. EFI, I seem to eat batteries, I've replaced the stator 3 times, just recently installed the new stator. It ran all day, only when night fell and I used my lights did I have an issue. The battery light came on,the speedo was blinking repeatly, and no...
  15. 2005 700 twin Fan and Fuel Pump Runs all time

    ATV Repair and Maintenance
    Upon hooking up the battery leads the fan and fuel pump immediately start to run. After reviewing the schematic it appears as if either the ECU is malfunctioning or the fan and power relay are welded shut. A bit of history, it appears as if one the ignition cable (spark plug cable) shorted out...
  16. 2005 Polaris 500 ATP - ECM problem?

    ATV Repair and Maintenance
    Can anyone tell me if there is a way to test the ECM on a Polaris atv? I hate to buy one if it isn't the problem. My atv has no electrical power to anything and the battery is a new one. No lights, no power to anything. All connections seem good. We have 12 volts going into the ECM but only...
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