2013 Scrambler 850xp TPS wiring screw up

[JacobSlabach 122]

Hey just picked up another scrambler 850 was told the tps was bad.  This atv has been beet to hell.  Wiring has been tinkered with the crankcase has been replaced recently and the motor rebuilt (can see horizontal scores thru spark plug hole where it’s just been honed out and rebuilt)

my guess is it was ragged out till the motor blew a rod and rebuilt but the clown that did it couldn’t get it to run again and sold it.  When I bought it it would pulse and smoke black at idle and die with throttle.

New tps installed and it won’t run period.  I went to celebrate it and I’m getting 5 volts on 2 of the 3 wires running to the tps.  Is this normal and if so how should I celebrate it?

[JacobSlabach 122]

TPS wires come straight from the ecu so would that be shot or is there something else that would be effecting it?

[JacobSlabach 122]

Found out the ecu is off of a sportsman lol would that affect it at all?  As far as I know it’s the same motor the only differences that I can think of would be this model doesn’t have EPS and scramblers are tuned more aggressive then sportsmans

[MarkinAR 123]

They are different part numbers so there's a good chance they are different.  I think a lot of motor and trans stuff is the same but I'd bet electronics are different.

[JacobSlabach 122]

now heres an idea:  i still have my other 2013 scrambler 850 LE (with EPS).  could i swap computers and see how my busted scrambler runs or not?  i believe the models are the same except one has EPS

[JacobSlabach 122]

I’m going to see how much a new Scrambler 850 computer is for it from Polaris cause I really don’t want to take the computer off my other bike it’s a pain to do and the wiring job on the base model from the former owner is shady I’d rather not screw my good ecu😂

[MarkinAR 123]

I wouldn't try it either, i'd hate for 2 wires to be crossed in the plug and burn your good one.  Check ebay, I bet there's a good used one out there.

[JacobSlabach 122]

agreed.  cheapest i can find it about 150 tho..  i guess if it dont work i can return it..

and thats another thing.. yall think two wires could be crossed on it?  the whole bike has been rebuilt... wiring harness has been chopped up some here and there and its got a new crank case on it

[JacobSlabach 122]

hows the best way to check to make sure the wires are not crossed?

[MarkinAR 123]

Your guess is as good as mine on wiring.  I usually scour the interwebs and look for a wiring diagram then get to color mapping everything.  I have no experience on Polaris machines.

[JacobSlabach 122]

ok thanks.  i did download the manual from here and am going through it.  i assume there would be a wiring diagram in there?

[JacobSlabach 122]

i dont see the wiring diagram in the manual which surprises me.  it even has a electrical section where i thought it would be but ive searched through the whole manual to no avail.  guess ill have to look on good ol' images and try and find one lol

[JacobSlabach 122]

update on this bike, found a wiring diagram, checked wiring, and its all good.  swapped ECUs with my other scrambler and the ECU is good.  took the bike to my local polaris dealer to dial in the tps and they charged me $100 to say the diagnostic tool said the new tps was toast.  so back to the drawing board.  ive heard of the timing gear on the cam jumping time on these machines so that may be an issue.. will check that also.