HELP!!! Ready to burn this thing

[katt68]

ok,
2007 polaris sportsman 500......
bike was working fine.
parked in garage for a couple of days...
go to use it and now running like crap. idles fine.
but sputteres and backfires on throttle.
no codes showing while running or idling.

but if i check for codes i am getting a bunch...

22(throttle position sensor, hi or lo)
44 crank position sensor circuit fault
45 map sensor
46 map sensor
55 MIL Circuit load or short to ground
47 IAC stepper motor

i have replaced the wiring harness to the map sensor...
i have unplugged the computer
i have disconnected the battery

codes will not go away...

what the hell?

[AKStew]

That stinks. Electrical problems can be really aggravating. 80% of problems like this are faulty wiring. A wiring diagram will be your friend. I don't have one or I would send it to you.

A weak battery can cause this. That would be the first and easiest possibility to eliminate.

There is also a fuse or circuit breaker for the EFI system that may have blown or tripped. In addition there is a relay (a little black 1-inch cube) thay may have gone bad (not likely). Either of these could have corroded connections since they are exposed to the elements under the cover just down from the headlight pod near the PCM.

If none of those is the issue...

My first suspicion would have been the MAP sensor harness but you say you replaced it. Since you have mutiple codes appearing all at once I suspect those sensors have a common ground point and would thoroughly check it and the wires for chafing and corroded connections. If that doesn't work, check the continuity to each wire on each sensor. It sounds like a lot to check but just be methodical and you will be done in no time. Taking the front plastics off makes it much easier.

That should get you started.

For the next guy, let us know if you fix it and what the problem was; or if you don't fix it, come back and maybe someone will chime in who thought of something else.

Stew

[tt425]

I don't know anything about fuel injected machines but I would look to see if you have any evidence of mice chewing on wires. Also drain some of the fuel into a clear container. It might have some water in the fuel. Maybe someone with experience on fuel injected machines could offer you more help. Maybe you will get it going soon.

[katt68]

is there any way of clearing my codes?
dealer says i have to bring it in so they can clear.....sounds ridiculous.

[AKStew]

It IS ridiculous! Unhook the negative battery cable for a few minutes (at least 30 seconds). If they immediately come back when you restart the machine I would say wiring is your problem. If it takes a little bit then the codes might be telling the truth. That is not the most accurate gauge but it gives you a general idea.

[AKStew]

I don't like taking it to the dealer but...

the dealer has a computer with software that can almost pinpoint where your problem is. If this gremlin gets too hard to find it might be worth letting them diagnose it for a set fee and doing the rest yourself.

Mine charges less than $100 to do this and sometimes the amount of time one could spend chasing an electrical problem is well worth it.

I'm not saying to give in yet but it is an option.

Stew