Poor running FJR1300AE

[70bsalightning]

Well, I am a happy guy!! The problem has been found and fixed. The "Cylinder Identification Sensor" was the culprit. This wasn't too hard to find once I was able to get an error code to appear. Code 11.

I was then able to ride the bike and have the issue, then disconnect the sensor and the issue went away. If I tested the sensor per the manual, the reading was good, but when it would heat up is when it would fail.

The real problem I have now is, Why didn't that error code appear sooner? The number of times riding the bike, with it missing and jerking, one would think the ECU would recognize a problem and throw a code. It took multiple times riding and for long distances, while failing, for it finally to get a blink of a code and store the error. I am glad it finally did though.

Anyway, just wanted to let everyone know so this may help out others when trying to diagnose a problem.............I'm going riding!!

Thanks for all the help guys!

 

[Mihalis fjr]

Glad that you found the problem.Assume that you will buy a new sensor.

I have never heard for a defective sensor all these years.

Thanks for the updating.

 

[70bsalightning]

Yes, I already replaced the sensor and everything is great!

 

[yanktar]

Interesting story! Reminds me of a balky '81 Chevy Citation I had. My mech rebuilt the carburator twice and hated seeing that car. Finally in desperation I got a service manual and saw how to get and read a "blink code" from the Check Engine light. Tossed a nearly identical code. Replaced the carb sensor wire and that POS Citation ran better than it ever did.

But that was the last Chevy I owned till I bought my '14 Silverado. I had driven a few as loaners and rentals and the only one that didn't suck was the old mini-van they stopped making. Till this truck.

 

[FJRPittsburgh]

Glad you got to the bottom of it. It's always interesting to follow the threads of unusual problems and see the final fix. The knowledge you can gather from the great people on this site is priceless. Enjoy that AE. Obviously they're the best!

 

[dcarver]

Where is the sensor located? What does it do e.g. what's it purpose. And if a cylinder isn't identified, how would the ecu know when to throw a spark to the sparking plugs?

 

[RaYzerman19]

Where is the sensor located? What does it do e.g. what's it purpose. And if a cylinder isn't identified, how would the ecu know when to throw a spark to the sparking plugs?

I'll say it's the one on the top of the valve cover, right side, called a Speed Sensor in the parts fische. The spark timing is sensed by the crankshaft position sensor/trigger wheel at the right side of the crankshaft.

The cylinder identification sensor/speed sensor may be linked to the rev limiter?.... resistance per FSM 421-569 ohms. Not sure of it's exact function, except at tech days if it was not plugged in at all, engine would not start.

 

[Denver_FJR]

Where is the sensor located? What does it do e.g. what's it purpose. And if a cylinder isn't identified, how would the ecu know when to throw a spark to the sparking plugs?

... Not sure of it's exact function, except at tech days if it was not plugged in at all, engine would not start.

Yeah, kinda scratching my head as 70bsalightning mentioned disconnecting it and bike ran fine. In some instances the ECU can "infer" or use a default value when some sensors go bad, but no idea how it could do that if crank sensor is disconnected.

 

[RaYzerman19]

If the CRANK sensor is disconnected, it will not run or start as ECU will not know when to trigger injectors or spark.. Cylinder identification sensor obviously operates differently, and you're right it prolly gives some default value if faulty.

 

[70bsalightning]

Yes, it was located on top of the valve cover. Not exactly sure what it does, maybe RPM's. All I can tell you is now I'm riding!

According to the microfiche the AE has 2 identical sensors like this on the bike. The other is a speed sensor. I never did locate that one though.

Hope all this helps.!