Question about Ducati 749 Motorcycles

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749 coolant temp reading sudden fluctuations

Temp reading on the instrument panel fluctuates suddenly and reads if overheating sometimes even when cold, have replaced temperature sensor but problem not rectified

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  • sny9812
    sny9812 Jan 21, 2013

    re 749 coolant temperature sensor reading sudden fluctuations. Put a new sensor in but still got fluctuations in the reading. Took it to a mechanic who knows his stuff, he found a short in the wire leading into the sensor, re routed the wire and seems to be all fixed, fingers crossed.

  • sny9812
    sny9812 Apr 17, 2013

    Re 749 coolant temp fluctuations. Turned out to be a short in the wiring leading to the coolant temperature sensor. Problem rectified. Thanks for your comments.



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  • Ducati Master
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Hi, Sny9812 for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.
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Temperature gauge keeps fluctuating whats the cause

Fiats have a reputation for electrical/electronic problems as they age and even when they are not very old they can manage strange things that even sometimes defeat the dealers, though the same can be said of many modern vehicles. I used to look after a Ducato motorhome and fortunately didn't need to get involved with much electrical work - the only faults were caused by the coachbuilders rushing around and being careless and not by Fiat.

I am not sure if the temp gauge is driven by the engine management or is a traditional circuit but either way the temperature gauge is in effect a voltmeter of sorts. Assuming the gauge is ok, the reading will only fluctuate if the voltage in the circuit fluctuates and that could mean the supply voltage is fluctuating or the resistance of the ground path is fluctuating.

With the traditional circuit the gauge is supplied by an electronically stabilised voltage and the ground path resistance is varied by the engine coolant temperature sensor and fluctuations could be anything from a faulty instrument voltage regulator, through faulty wiring or connections to the temperature actually fluctuating.

If the gauge is driven by the engine management the same approximately applies but checking the circuit becomes much more complex due to the need for circuit diagrams and specialised test equipment, though these would not be needed just to check the security of the gauge in the printed circuit of the instrument panel.

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Check the coolant level. Sometimes when the coolant level is low, it will cause gauge fluctuations like you suggest, since air is getting into the cooling system. When air is in the system, it causes the thermostat to open and close frequently resulting is wild temp gauge swings.

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Click on the link.
This may not help, but, I thought it might help you understand how it works. Could be problem with wiring circuit, somewhere? If the coolant temp sensor was replaced, it might have gotten air in the system, that can cause the temp gage to act up.
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Most obvious question is when that happens, is the engine actually overheating or just reading that it is?
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