Water temp puzzle!! - Page 2 - BMW S1000RR Forums: BMW Sportbike Forum
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post #11 of 16 (permalink) Old 04-18-2017, 09:02 AM Thread Starter
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There is no fault code on the bikes for the engine not warming up properly or even over heating. Temp sensor fault or a relay or the fans will fault. Other than that you just watch the guage for an idea or wait til it's dumping coolant out on the ground from somewhere.

Just managed some time at the garage. When the bike ignition is turned on, the temperature is reading MINUS 78, when it is run up for a little while it never goes above + 50c, doesn't seem to be a problem with thermostat. As I mentioned earlier this is a replacement sensor and the previous one was having the same readings.

Any thoughts?

John
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post #12 of 16 (permalink) Old 04-18-2017, 06:05 PM
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Are you confusing thermostat and the temp sensor? They are 2 different things.
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post #13 of 16 (permalink) Old 04-19-2017, 01:40 AM Thread Starter
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Are you confusing thermostat and the temp sensor? They are 2 different things.
No I'm quite happy with what is what.
Why do you ask?

The sensor has definitely been replaced. I say the thermostat may be ok as on testing the pipes they both were not hot after starting.

It is the - negative temp reading on the dash clocks which is now causing me the confusion.

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post #14 of 16 (permalink) Old 04-19-2017, 02:43 AM
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When you check the rad hoses. One side will be hot to start with. One will stay cold until the thermostat opens. So I want to know once the bike is hot. Are both hoses hot? Telling me they are not hot after starting is not what I need to know.

Also. If you let the bike run for say 10 minutes at idle. Do the fans come on at all? And if they do come on, do they switch off again?
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post #15 of 16 (permalink) Old 04-19-2017, 03:12 PM Thread Starter
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Originally Posted by bennymx View Post
When you check the rad hoses. One side will be hot to start with. One will stay cold until the thermostat opens. So I want to know once the bike is hot. Are both hoses hot? Telling me they are not hot after starting is not what I need to know.

Also. If you let the bike run for say 10 minutes at idle. Do the fans come on at all? And if they do come on, do they switch off again?
Apologies Benny, I knew what I meant Only one hose gets hot after running for a while, then a few minutes later they both are then hot.

The garage was able to to access the ecu through the diagnostic software which had not been available last week. Interesting results.

Upon starting the bike the ecu is telling the diagnostics that it is 15c however the dash shows -40. After the bike is run up to temp, around 90c (on the diagnostics) it displays 60c on the dash. At 101 the fans cut in and successfully bring the temp down, at this point the dash and diagnostics read 99c!!??

The garage is happy the bike is running fine and the cooling system is working ok despite showing incorrect details initially on the dash. The question is if I'm happy to accept it as it is, or spend more time and money (lost racing) further sorting the fault.
I'm leaning towards getting the bike on track and seeing how it runs.
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post #16 of 16 (permalink) Old 04-19-2017, 05:56 PM
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Never seen that before. I wonder if its the dash itself. Need to borrow a dash off someone and plug it in.
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