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Discussion Starter #1
Hello all. This is my first post here. I hope this site helps me solve a problem and maybe I could help others sometime!

Anyway, I have a 1999 Polaris sportsman 335 and the oil cooling fan does not come on at all. I have tried to bypass the temp sensor by unplugging the 2 yellow/black wires coming from the sensor and turned the key to on...nothing. I have power going to the fan as the red/white and orange/black wires coming from the fan are both "hot" and light up my test light.

Now, I was able to get the fan working when I unplugged the orange/black wire from the fan and grounded it to the frame. I see this orange/black wire goes to a black box that I think is a ECM??? Is there a wire that I should be checking that comes from this ECM that could be a ground that is loose?...Or would a bad ECM not be allowing a ground connection? Is there a way to test the ECM itself?

Much thanks in advance!
 

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If you can figure out ho to get it to run off the ignition switch, think you'll be fine. Both my Arctic Cat and Polaris' fans come on when I turn on the key. Water cooled, though.
 

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I would like to rule out if I just have a bad ground somewhere or if it's the black, square ECM module. If the problem is the ECM and they are expensive, I would hotwire it to be on all the time (should be easy to do this) but if it is just a bad ground, I would like to fix it right.
 

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Is this black box that the oil temp sensor goes to (that I have been calling the ECM) really the rev limiter? I found a link here that describes this box exactly! http://www.polarisatvforums.com/forums/polaris-sportsman/36665-1999-sportsman-335-rev-limiter-question.html

I also have been dealing with what I though was carb issues as I have no power and it's sluggish even going forward. I though the rev limiter only limited in reverse but if it is shorted out could this also be causing it to be bogging in forward? I thought it was just bad gas or needed a carb clean because it was just pulled out of storage after sitting half a year or more...but I wonder if this "rev limiter" got fried because of a short or something. There was a bunch of mice bedding inside but I didn't see any obvious chewed wires and like I said, The wires going to the fan are hot.
 

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Hello, I am Experiencing the same things, Did you ever find a solution ?
thinking it’s my fuel pump or carb but my fans isn’t running. You have me wondering.
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Is this black box that the oil temp sensor goes to (that I have been calling the ECM) really the rev limiter? I found a link here that describes this box exactly! 1999 sportsman 335 rev limiter question

I also have been dealing with what I though was carb issues as I have no power and it's sluggish even going forward. I though the rev limiter only limited in reverse but if it is shorted out could this also be causing it to be bogging in forward? I thought it was just bad gas or needed a carb clean because it was just pulled out of storage after sitting half a year or more...but I wonder if this "rev limiter" got fried because of a short or something. There was a bunch of mice bedding inside but I didn't see any obvious chewed wires and like I said, The wires going to the fan are hot.
[/QUOTE]
 

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Hello, I am Experiencing the same things, Did you ever find a solution ?
thinking it’s my fuel pump or carb but my fans isn’t running. You have me wondering.
Nothing like reviving a 5 year old thread :rolleyes:

140120


The red/wht wire is hot - brown is ground when the LR60 module senses the thermistor is closed, it turns the fan on - if the temperature continues to rise, the hot lamp comes on - PERIOD! See table below.

140121
 
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