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Discussion Starter #1
Dear all,
I have a kind of a similar problem with my brutale 1078 RR for unknown reasons my Fan not working and the Temperature reading go upto 130C. And starting pee a kind of steem and the radiator water. All First start flashing the reading @ 110C.
- have Checked all the fuse, Checked the Fan with direct wiring with battery it start and working, have changed coolent and cleand the radiator, but still the fan not working, bought a new water and oil temp. Sensor and replaced still the fan not kicking or starting when the temperatures get into 90+ so please any advise will be much appriciated.

Thanks for all in advance.

Cheers,
 

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Okay mate there is 2 temp sensors on the 1078.
Download the workshop manual from the link provided.
Them locate the two sensors ans swap their plugs around, warm the bike up and see what happens.

Have you checked the fuse - F5.

Might be SPU but not usualy a problem on the later B4's as far as I know.
 

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Discussion Starter #3
Thanks Donsy,
Really appreciate your feedback; I have checked the fuse F5 also replaced it with new one. Same time, when we talking about the two sensors, it that the one on workshop manual Section D page 7 that #1- B: Engine coolant temperature sensor and #2- E: Intake air pressure/temperature sensor?

I have changed new #1-B: Engine coolant temperature sensor, but have not replaced #2-E: intake air pressure/temperature sensor, I just unplugged and cleaned it, so do you think that could be a possibility of faulty? Is there any ways to check the intake air pressure sensor if it works or not? Awaiting for the feedback again.

Kind regards,
 

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Thanks Donsy,
Really appreciate your feedback; I have checked the fuse F5 also replaced it with new one. Same time, when we talking about the two sensors, it that the one on workshop manual Section D page 7 that #1- B: Engine coolant temperature sensor and #2- E: Intake air pressure/temperature sensor?

I have changed new #1-B: Engine coolant temperature sensor, but have not replaced #2-E: intake air pressure/temperature sensor, I just unplugged and cleaned it, so do you think that could be a possibility of faulty? Is there any ways to check the intake air pressure sensor if it works or not? Awaiting for the feedback again.

Kind regards,
Not the air pressure sensor. Are you looking at the right manual. Section E - Page 8.

Does the coolant valve open, so water gets to the radiator?
Thermostat hb :smoking:, that could be the reason for his overheating.

As far as I remember the sensor on the engine is the one that activates the fan, so even if the thermostat does not open, the fan should still kick in ?
 

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Not the air pressure sensor. Are you looking at the right manual. Section E - Page 8.



Thermostat hb :smoking:, that could be the reason for his overheating.

As far as I remember the sensor on the engine is the one that activates the fan, so even if the thermostat does not open, the fan should still kick in ?
You are right about the thermostat word, could find it at teme of writing. But it does not make sense to me kicking the fan when the radiator does not get hot water.
 

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You are right about the thermostat word, could find it at tiem of writing. But is does not make sense to me kicking the fan when the radiator does not get hot water.
If his display is showing 130degC hb, then it's getting hot water I recon ?
 

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Not when it is the head sensor that goes to the dash and fans are controlled by the radiator sensor which has no hot water yet!
On the F4 and I thought it was the same on the B4 ( sorry if I'm wrong Hans ) , the radiator sensor does the display and the cylinder head sensor does the ECU and fans ?

Are you near your bike, can you unplug it to check, or do you know for sure ?
 

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Discussion Starter #10
dear Donsy & Hans,

Thanks again for your comments, I might be wrong, but what i could see on Brutale 1078 RR is one sensor that's plugged on the left side of the engine, there is non or could not see any sensor on the radiator itself as earlier model has it on the left side. when it reach to 130c. hot water will come out as well as steams in the bottom.

Same time Donsy, mentioned that the water temp. sensor on CPU where it located? thanks all for your time.

Cheers,
 

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That is correct...one coolant temp sensor with 4 wires, 2 elements on the Euro3 spec bikes (including 1078). One element for meter, the other for ECM, which controls the fan.

There is a resistance test for the sensor with measurements taken at different water temps (suspended in pot of water on a heating element like the stove in your kitchen).

I think the fan will come on if you unplug the sensor (either that or short across the connector terminals). The ECM or the SPU are faulty if it doesn't when all wiring is continuous and the fuse is good.
 
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