| Author | Message | ||
     Flog |
The red engine management light on my XB12STT has just started to come on at 3000 rpm and then goes off again at 3200 rpm. It doesn't come on outside of this rev range. I have a D and D muffler and K and N Air Filter but these have been on for a long time with the servo still plugged in but disconnected from the muffler. The bike has done 10000 kms. Does anyone have any ideas as to where I can start to look for the problem? The bike runs fine it is just the light comes on from 3000 to 3200 revs.} | ||
| Froggy |
I would check the error code it gives, you can use ECMspy to read the codes or you can manually jump the pins and it will flash the code on the dash, the instructions are in your service manual. | ||
| Iamarchangel |
Doesn't sound like there would be any error codes, it would have been mentioned. Just in case: when you start the bike (key on, run on but before start switch), the Check Engine Light (CEL) stays on for four seconds and then goes off. If it does not go off, or starts blinking, there is an error code. What happens at key on/run on? There's only a couple of things that have the light come on without a code: heat and ground problems. Very rapid flashing is a ground problem. Could be at one rpm frequency but not too likely. When the engine is too hot, the CEL comes on. Did this happen in grid lock, heavy traffic situation? (Does this happen every time you are in that rpm range, cold or hot?) In any case, seeing as the Engine Temperature sensor is the only sensor that will trigger the CEL without a code, that is the one I would check. | ||
| Barker |
that also the rpm range of 12 stock ecm dead zone. Stock/Race/Modified ECM? | ||
| Flog |
HI folks Thanks for the responses! Much appreciated. There are no error codes. When I turn it on it does its check and then the light goes out indicating everything checks out fine. I ride the bike and all is good until I ride at a constant 3000 to 3200 revs in fifth gear - then the light comes on - when I go under that or over that it goes out. When I return to that rev range it comes on again. It doesn't blink - it is just a constant light until it goes off. Thoughts? | ||
| Iamarchangel |
Is that only in fifth gear, it doesn't happen in other gears? | ||
| Flog |
It happens in fourth and fifth gear.Its winter time here in Australia so I don't think overheating is a problem. It happens also on the open road and not around town. It seems to me like it happens on a constant throttle setting in that rev range. Strange!!! | ||
| Augustus74 |
Maybe some strange harmonics (out of balance) in that rpm range? | ||
| Flog |
Can anyone tell me how many sensors feed the engine management light? Like what do they do and where are they on the bike? | ||
| Flog |
Heh Barker The ECM is stock. What do you mean by the 12 stock ECM dead zone? | ||
| Iamarchangel |
There are six sensors that feed the ECM. One applies in lay-down applications, the Bank Angle Sensor, so really, you are dealing with five. Any alert you get from them through the ECM seems to be in the form of flashing/blinking so I don't think we're really looking for that yet. Manual suggest four problems result in a constant CEL. 1) Stored fault: but that shows up at start up. Have dealer check (or ECMspy) to rule that out. 2) Replace ECM, expensive and everything else is working. Wait before replacing. 3) Ground problem with Bk/Y wire to tach 4) Ground problem with Bk/y wire to connector. You can't test for your situation which is it happens at speed. Go over your ground wire very carefully. There are two ground screws on the steering stem (below the fairing mount and above the bottom triple clamp) to check. I would be leaning towards Augustus74's harmonic vibration triggering a short at that frequency/vibration. Those are a lot of fun to hunt down. | ||
| Jason13 |
the TPS mite have a dead spot in or burn spot from constant uses in the zone on the TPS. if you can hook up your TPS to a meter (while on the bike running) you can read the volts it is putting out look for drops in volts and resistance to see if there is a dead spot in the sweep of your TPS. | ||
| Iamarchangel |
Jason13 reminded me of this thread. Might want to run a couple of pm's to see if their engine light story lines up with yours. Sounds similar. At least it's an easy visual check. http://www.badweatherbikers.com/buell/messages/327 77/446068.html | ||
| Flog |
Iamarchanagel/Jason13 Thanks for the advice! I new to Buells and not very technically minded. Can you tell me what the TPS is? I will check the ground connections to make sure they are secure. | ||
| Jason13 |
its a sencer on the side of the throttle body it should be a 3 wire concter but not sure how many wires. you can look up how to test it and also what the readings should be when you sweep the throttle. look on line ill look also to see what i can find. good luck  | ||
| Timothytyson32 |
I have the same exact problem. 2007 XB12ss w/2800 miles. Have taken it to the dealer twice and had checked for alerts and nothing. It still does it and is annoying but I don't notice any drop in performance. Thanks for the updates and Flog if you figure it out please post results. Thanks | ||
| Flog |
I got up early to ride the 2 and half hours to the Buell dealer to let him have a look at the problem. I spent the first 45 minutes trying to get the red warning light to come on. It wouldn't so I turned around (I didn't want to take it to the mechanics unless the problem was evident) and went for a decent days ride to see if the problem would start. It didn't. The bike is performing faultlessly. The only thing I can put it down to was I had put some E10 (this is petrol with 10% Ethanol - 94 RON) fuel in. This must have caused the problem as I filled up (as I always do) with 98 RON fuel and the problem went away. That is all I can put it down to is low octane fuel or Ethanol added fuel. I will let you know if the problem recurs. I put a total of 300kms on it that day sitting on the 3000 to 3400 rev range and no light came on. Fingers crossed that that is all it was! |
