Yesterday after I started my bike, the engine light came on for about 5 seconds then went off. Best I can tell everything seems to be working normal, but just as a precaution I went to the dealership.

The service manager checked the bike and said it wasn't giving a "hard code" and that the light coming on was most likely due to the fact that it's getting cooler outside and that is causing the bike to run leaner. Anyone heard of this? Is this feasible?

 

next time check it yourself right when it comes on...i don't know about their excuse...never heard that one myself

https://www.hdforums.com/forum/sport...odes-dtcs.html

that link will show you how to check it and decipher the code

 

Thank you. I did this and got code U1097 which comes out to

U1097 Loss of Speedometer Serial data Carb
U1097 Loss of Speedometer Serial data EFI
U1097 Loss of Speedometer Serial Data to ECM
U1097 Loss of Speedometer Serial data TSM/TSSM


Anything critical?

 

I got the same code this summer shortly after installing my PC5, I cleared it and it hasn't come back in about 4K of riding so I'm hoping it was just a glitch.

 

Every now and then, computer/electronic stuff hiccups. The code stems from a bad reading from the speed sensor and these things can happen occasionally. I'd worry about it only if it happens again.

Then, the first thing I would check for would be a dirty or faulty speed sensor.

 

When it gets cooler out the inital warm up period will be richer, not leaner.
Like in a old car or truck when you had to pull the choke out a little to run til warmed up.
Not unusual for the check engine light to come on in this case.
Most computers set either a soft or hard code.
Soft is a temporary code and symptom that was just a "burp" in the system.
But if it is regular then you should investigate it.
Hard code, is when something has actually failed in the system, usually a sensor, but could be an injector or such. (this is just basic info).
when weather gets really cold (20 degrees and colder) and if you ride then, not unusual for check engine light to come on periodically during ride.
especially if you have the O2 sensor in exhaust. Computer make make system too rich or too lean momentarily and cause light to come on.
Many dealer techs, know how to read a book, but they do not understand HOW a fuel injection system actually works, the theories behind it. For that matter they didn't understand how carburetors worked either.
So a question. In the most very basic of principles, how does a carburetor work and can you replicate it on the kitchen table with items from your cupboard?
I'll try to check back later to see how many actually understand mechanics, for those that care to understand. I know, some don't, we all have our interests.

 

Gotta go with cHarley here. If you get it again, clearn the speed sensor. After that replace it.

 

not necessarily...i am working on a customer's bike and am having to rewire the wires at the neck because while on the kickstand with the bars to the left his speedo doesn't work...straighten out the bars and the cel goes away