| Author |
Message |
    
X1lightningx1
| | Posted on Monday, March 09, 2009 - 02:37 pm: | 
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does anyone know a way to test the head temp sensor? I dont want to just keep throwing parts at my bike, id rather diagnose.
Thanks |
Sparky
| | Posted on Monday, March 09, 2009 - 03:57 pm: |
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Hey, now that's the right approach. So, with multimeter in hand and a chin-up attitude, let's have a go at it.
Assuming the X1 temp sensor is similar to that of an XB9R (because I have an XB9R FSM), steps to check it out are:
1) disconnect the ET sensor connector
2) measure resistance between ET connector terminal and ET body
3) Is resistance between 33761 and 74328 ohms at room temperature (69 - 90 deg F)?
Where the troubleshooting steps go from here depends on the answer to the last question. |
Kalali
| | Posted on Wednesday, March 11, 2009 - 04:54 pm: |
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Well, come on man...
So if the resistance is between those two numbers, is the sensor good or bad? |
X1lightningx1
| | Posted on Wednesday, March 11, 2009 - 05:13 pm: |
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Just checked this morning.
The resistance was WAY below 33761. However, per recommendation of another BW biker, I relocated the IAT sensor and went on a test ride and now the problem is intermittent! Is it worth the $43 to throw a new ET sensor on? |
Reepicheep
| | Posted on Wednesday, March 11, 2009 - 05:22 pm: |
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Measure the resistance cold, then measure the resistance hot, and post the two values. That will probably make things obvious. |
X1lightningx1
| | Posted on Wednesday, March 11, 2009 - 05:39 pm: |
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When I measured it cold it was bouncing around something like 20000 then hot it stayed the same. But I just retested and the problem is not intermittent, it was just trying to trick me. Once I got it warmed up it missed above 2000RPM and idle was ok until i revved above 2000RPM. When I did that it would hold that RPM, even if I let off the throttle (or pushed the throttle back closed). Then after about 3 seconds at 2000RPM (after I let off) it would slowly come back down and miss around 1300-1800ish, then settle in calmly around 1000. |
Sparky
| | Posted on Wednesday, March 11, 2009 - 06:33 pm: |
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When you did these resistance measurements, did you disconnect it from the wire harness?
If so, and this a big if, the head temp sensor is the same as on a XB, then 20000 when cold is out of calibration depending on the temperature of the sensor.
A thermistor resistance to temperature curve, if plotted out, is non-linear as compared to that of a resistor which is linear. Specific data points which validate the above two sets of numbers are:
deg F = ohms
104 = 25647
77 = 41295
50 = 93759
So you can see that if it read 20000 and the sensor temperature was around room temperature (70 deg F), your HTS is probably bad unless there is some other issue like a wire harness high resistance short to ground.
Your hanging idle intermittent problem may or may not be related to a defective HTS. |
Buellisticx1
| | Posted on Wednesday, March 11, 2009 - 06:50 pm: |
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Usually only find out if a problem is the head temp sensor by replacement in a known good one. |
Reepicheep
| | Posted on Wednesday, March 11, 2009 - 09:06 pm: |
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Or you can test it by properly measuring the resistance cold then warm.
I suspect it is just a thermistor... it changes resistance with temperature. If its bad, it probably will stay at one place (like infinity). |
X1lightningx1
| | Posted on Wednesday, March 11, 2009 - 09:25 pm: |
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Well this helps. I will order up a new ET sensor and see if it fixes the problem. |
Al_lighton
| | Posted on Thursday, March 12, 2009 - 05:31 pm: |
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My experience is that the only real way to know is to replace it. The problem is that one common failure mode is that the wire breaks inside just below the internal crimp. When the wire ends are touching, and they will be often, it measures fine. But under vibration, the connection becomes very intermittent.
I've seen so many head temp sensor failures, and so many flaky engine problems because of it, the Head temps sensor has become Al's third rule of Buell motorcycle mechanics: If it isn't a grounding problem (Al's #1 rule) or it isn't something related to the last thing YOU worked on (al's #2 rule), then it is the Head Temp Sensor until proven otherwise.
Al |
Buell_bert
| | Posted on Friday, March 13, 2009 - 02:22 am: |
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Al can we post this above the door as we enter here. Just as a reminder that is. (Not Murphy's Law, Al's Law). I think it is just great. |
X1lightningx1
| | Posted on Friday, March 13, 2009 - 11:08 pm: |
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Well unfortunately, the replacement of the sensor did not work. Also, unfortunately, I have sold the bike : ( someday I will be back on the glory that is Buell... |
Buell_bert
| | Posted on Saturday, March 14, 2009 - 03:20 am: |
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Damn, sorry it had to go to this. But you can still hang around. You don't need any bike just to be here. When I sold my Harleys to buy the house years ago it did not mean I walked off the face of the earth. This is for Buells but I still like 4 wheelers and snowmobiles and flat bottom boats and tractors and who knows what tomorrow. Waiting for warm weather and clean roads. |
X1lightningx1
| | Posted on Saturday, March 14, 2009 - 03:54 pm: |
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Sounds good to me. I'll continually be checking the classifieds |
Sparky
| | Posted on Saturday, March 14, 2009 - 04:13 pm: |
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Hey X1, I know it's hindsight asking the following, but did you happen to measure the resistance of the replacement temp sensor before installing it? But if you didn't, that's OK. I can understand it can be frustrating trying to fix a machine that's difficult to troubleshoot.
I'm curious if it read in spec. And if it didn't, maybe that would explain why it didn't clear the problem you were having. |
X1lightningx1
| | Posted on Sunday, March 15, 2009 - 02:31 am: |
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Ya know, me being so eager for it to work, I just trusted good ole Buell factory replacement parts. I did not test it, although I should have. That certainly would have been the intelligent thing to do... oh well; next time I guess |
Vlightningx1v
| | Posted on Saturday, August 21, 2010 - 05:46 pm: |
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I am on my second hts. Check the codes and the ecm will tell you if hts has failed. Also you will really feel the heat cooking your leg. |
Vlightningx1v
| | Posted on Saturday, August 21, 2010 - 05:49 pm: |
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question is can you bring them back? |
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X1 head temp sensor