My 2017 Honda TRX 500 FM1H engine light came on. It blinks 8 times; short blinks. It doesn't long blink before the short blinks. The idol is also faster than normal. I did use the ATV one day, no more than 2 miles, but it's sitting until I can troubleshoot it. The other forums didn't help much. Is anyone familiar with the issue & what needs to be serviced? I am nowhere near a shop, so I have to do this myself or hire a hand.

Update: I just fiddled with some wires, cleaned the filter box & everything is back to normal. I do need to order a new filter soon. 🤷🏽‍♀️ I'm happy it wasn't anything else. We'll see how it rubs in the next few days. Fingercrossed it just needed a clean lid & reinserted wiring. I do have another inquiry, but that's for another post.

 

My workshop manual is at work so I can't be sure what code 8 is, but a Google search fetches up 8 as "throttle position sensor problem," which would sort of tally with the high revs. Check on the throttle body, that the lever is hitting it's stop at idle, and remove and check the TPS. They are expensive so be sure it is that causing the problem. I have just changed one and found it didn't improve things (wasn't coding but was revving too high). You also need to go through an initialising process if you do fit a new one. Again, without the book, I can't remember what that entails.

 

May you please look into it when your book is handy? I'd appreciate it a lot. I hope to find videos on how to do the maintaining as well. Thank you!

 

Have any parts been replaced lately?

 

The starter, solenoid & spark plug has been replaced, but not recently. We're having below zero temps. I'm waiting until it warms up a bit to check the spark plug and the wire that runs alongside the body to the back. I don't remember what it's called. Tips and links to videos will help.

 

Couldn't find the bit about initialising a TPS sensor. Honda manuals bury stuff like that in amongst the various tests you need to do to check a component, most of which require specialist equipment anyway, which only dealers have. Frankly, fixing fuel injection systems is difficult, I suspect most mechanics end up substituting components until one of them fixes the problem. Expensive for the home mechanic, but less so for ATV mechanics, who can take the bits that didn't fix the problem off, and save them for next time they get an EFI problem. Fault codes can be the wiring too, I've just had an intermittent fault code 52 on a Honda 420 Auto, which is "neutral switch problem", and found a broken wire between the gearbox switch and the main loom plug.