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The other day I went to start my 2007 Polaris Sportsman 500 EFI ATV and when I turned the key to on, I got nothing, no display and no power to anything. Then after 10 seconds the display / power came on for only 2 seconds, then back off again for 10 seconds. It just keeps doing this over and over again. If I hold the key constantly in the start position, when the power comes on for that 1-2 second period, it will start. But then dies right away when the power goes back off. Then it will do it all over again.

I previouslly had a 07 Sportsman 500 EFI that did the exact same thing. I bought a used PDM and ECM. When I replaced the PDM behind the radiator, it did not help. But when I replaced the ECM brainbox under the headlight, it worked fine. But I've read where the PDM tends to go bad a lot.

My question is, how can I troubleshoot and see if its the ECM or PDM that is bad before I shell out $400 for a ECM?
 

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Welcome to the board!:med:
 
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