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Discussion Starter · #1 · (Edited)
Hi I need a little help figuring out what is going on with my 2017 XPT4. I will try and keep this short. My car ran fine prior to the install of a new rear sway bar. I wanted to test things out. No sooner had I pulled out of the garage my engine light came on followed by my power steering warning light. The car was not reading the gear nor my speed. I checked the diagnostic codes on both the car and my Dynojet module. It read 84/2 and 84/19. Both speed sensor issues. I thought that was weird as I hadn't touched the speed sensor. I checked my work on the sway bar and noticed I had pinched a corner of the wiring harness that runs beside/behind where the sway bar mounts on the driver side fire wall leading up to ECU and to power. A part of the harness was well squished as I had tightened all the hardware on the mounts. I immediately loosened the harness and freed it up hoping that would take care of it. No such luck. I opened up the harness in that location and found 3 or 4 wires badly flattened and one orange wire completely broke. The orange wire was likely the power wire running to the speed sensor. I repaired all the damaged wires I could find after inspecting them all. I figured this would take care of my issue. Again no such luck the codes still were present and the car ran but did not have full power and still no gear or speed was showing on the dash. I tried clearing the codes every way I knew how. First using the old take the negative terminal off the batter for 30 seconds that did not work. I tried resetting and clearing the codes with my Dynojet module. They kept returning. I removed both positive and negative terminals on battery and touched them together. Checked all fuses. I drove the car in low gear and at 5000 rpm for a minute (I had read on another form that this would reset the speed sensor). Finally I reflashed the car with my Dynojet module. This latter effort seemed to work for a second as codes cleared but then returned after about a minute of the car running.

I decided to check the power to the speed sensor to be sure my wire repair job had worked. I removed the sensor to the speed sensor and tested the pin running from the orange power wire. It read 12.v. The green/red wire running to the ECU showed 4.0 volts. the brown wire is ground. Based on more research these seem to be correct. So the speed sensor seems to be powered and the wire to the ECU seems to intact as well.

At this point I have no clue what to do. Scoured the internet and forums. I am thinking I may have fried the ECU and/or speed sensor while the car was shorted out briefly. I have ordered a new speed sensor first as that is the cheapest option. Should have it in a day or two thanks to Rocky Mountain OEM parts. While I wait I wanted to see if anyone had experienced any kind of electrical issue like this before? I mean a 15 min job replacing the sway bar has turned into a wild goose chase. What a dumbass move...lol. Any help or insight would be much appreciated.
 

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Ya know you mentioned it didnt show the gear it was in. Now here is something to ponder. First mine is a 2017 1000S. I also have a gear sensor problem, wont show park or high...If I pull into high and then go up it will show low in the proper place and neutral and reverse. Now I can clear the code in Low after traveling 20-30 feet. Then I can shift to High and run for a long time before the code shows up, and it show's up after I turn it off. Now with the lights on and the codes on I can also turn the lights off in REVERSE. Now my plan is to buy a new gear selector sensor and replace that and see if the gauge cluster and Ecm has to know what gear its in before throwing the code. mine runs fine other than the power steering light and the check engine light coming on.
 

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Discussion Starter · #5 ·
Hi Bubbazwv. Thanks for the feedback. I am still in limbo here. I have put in a new speed sensor and checked the continuity of every wire going into the ECU. All checks out. I have the car over at an electrical/wiring specialist now and he is still trying to figure it out. We have the wiring schematic which helps some. Same codes are showing up 84/2 and 84/19. The car runs but almost like it was in limp mode. Just no power. Likely because the turbo is not kicking in. What a pain in the arse. A very unique self inflicted injury is turning into a problem no one has been able to figure out yet. I may have to take it to a Polaris dealer which is not what I wanted to do. The wiring guy said it could come down to the ECU and a circuit in there possible being damaged when I shorted the thing out from pinching the main wiring harness heading into the ECU? Trying to find someone with a 2017 turbo locally who would lend me their ECU so we can test that theory out before I go buying one.
 

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Discussion Starter · #6 ·
Update:
Update: Still no solution. I installed a new speed sensor and checked the continuity of all wiring coming/going from the speed sensor. All checked out. All fuses checked out. I also checked the continuity of all wires above the below the area of crush and stretch. I did this with the ECU unplugged and battery disconnected. I checked the wires from the ECU plugs to below the area of crush. Still working through but finding continuity. The damaged wired I originally found and repaired are showing continuity. Just don't know where to turn from here. The car runs but has no power because turbo is not kicking in nor do I have a gear indicator or speedometer showing in the guage cluster. Any help or insight would be appreciated with this unique problem.

Anyone in the Phoenix/Peoria AZ area that either has an ECU or one in their car that would be willing to let me borrow it? My feeling is if everything in the wiring harness checks out then I may have fried a circuit in the ECU.
 

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You should be able to test the gear position sensor with an ohm meter, if it passes that I would lean heavily towards the ECU being damaged.

However, since you "squished" some of the wires, I wouldn't trust a standard tone type continuity test. I would get a noid light and test those wires for being able to handle more of a load.
 

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Discussion Starter · #8 ·
Hey thanks for the feedback CrazyElecE. I have the car with one of the top wiring/electrical guys in the Phoenix area. He is doing that kind of testing and so far everything checks out. He is still working through his progressions. In the meantime, I am searching for an ECU to try before I go and pay for a new one. Thanks again for your insight.
 

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I went to the dealer yesterday with the intentions of buying a gear selector and a speed sensor. The guy at the parts counter mentioned the ECM. He would have to order the parts,,,lol,,, so in short I came home empty handed. Big Plus is Im going after a friends gear selector and speed sensor soon and try that and see if these work. Its kinda funny that mine will work fine in low and reverse but not in High..
 

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Discussion Starter · #11 · (Edited)
Ok I wanted to follow-up and close out this thread. My problem was unique but may help someone else in the future.

One of the wires I pinched was an ignition wire. It caused a short and damaged a circuit in my ECU. Wiring was repaired but codes and car running poorly continued. Replaced the ECU that a friend lent me and no more problems. It was the ECU that got damaged. Some will tell you this can't happen but I am here to tell you it can. What a pain this ordeal was. I hate electrical issues!
 

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Ok I wanted to follow-up and close out this thread. My problem was unique but may help someone else in the future.

One of the wires I pinched was an ignition wire. It caused a short and damaged a circuit in my ECU. Wiring was repaired but codes and car running poorly continued. Replace ECU that a friend lent me and no more problems. It was the ECU that got damaged. Some will tell you this can't happen but I am here to tell you it can. What a pain this ordeal was. I hate electrical issues!
Thanks Mark for replying with your fix. So many of these threads are just left with no solution even though there may be several solutions some don’t come back with their fix
 
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