Odd Fan not working issue - MVAgusta.net
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post #1 of 34 (permalink) Old 05-30-2016, 10:19 AM Thread Starter
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Odd Fan not working issue

Got a service with the new(ish) Scottish MV dealer and I had them look at a non-functioning rad fan that died relatively recently.

Obviously I'd checked the fuse myself and it's not that.

They say that they can manually switch the fan on when logged into the ECU - so it works and the relays, fuses etc must work. The temp sensor is also reporting sensible values.

But the bike won't switch the fan on when it gets hot enough (I think they mentioned 102 degrees C as the set value)

They were stumped and have asked MV for guidance, but just in case it was something that anyone else has come across?

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post #2 of 34 (permalink) Old 05-30-2016, 11:04 AM
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If fan wiring and fan are proved ok it must be a signal problem so I would replace the sensor as first trouble shooting. Shorting out sensor wires will make fan run and prove its a sensor issue.
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post #3 of 34 (permalink) Old 05-30-2016, 01:15 PM Thread Starter
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Sensor is reporting sensible values to the ECU supposedly though - as they could tell me what temp they let it get to.

Unless there's a separate sensor for fan activation that differs from the dash display? I'll check the manual

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post #4 of 34 (permalink) Old 05-30-2016, 11:20 PM
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Odd Fan not working issue

I was having issues with the fan/temp on the Turismo, turned out it was the sensor by the headers which was matted in rubber from the radiator cap, had both replaced and now running sweet.
Hope it's an easy fix mate.


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post #5 of 34 (permalink) Old 05-31-2016, 03:30 AM Thread Starter
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Yep - looked at the manual to find two sensors, one in the head as Red says and one in the rad end tank. Next job, whip off the fairings and test the sensors (resistance values are given in the workshop manuals) and short out the plugs to see if that prompts the fan to come on. One would hope the dealer had tried this, but just to be absolutely sure for myself.

Streetrider - the sensor in the head is to the right hand side of the bike, you can see the plug going into it just above the headers when you peer in the right hand air outlet in the fairing.

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post #6 of 34 (permalink) Old 05-31-2016, 07:09 AM
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Let us know how you get on.
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post #7 of 34 (permalink) Old 06-03-2016, 03:01 AM Thread Starter
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Just to update, the sensors tested okay for resistance, certainly at ambient, so current thinking is wiring issue.

Bike's going back in to dealers for an extended stay so they can strip and check.

Just out of interest, from my unplugging session, it looks like the one in the head feeds the dash and the one in the rad might be what the ECU uses to determine fan activation (which makes sense)

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post #8 of 34 (permalink) Old 06-10-2016, 07:05 AM
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Had the same problem, changed both sensors and the fan is now working correctly after this even on realy hot day, as long as the bike was not standing still I had no issues with temp, unitl as was stuck in traffic yam in Stockholm
The sensor seamed to get the right reading in the computer, good luck
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post #9 of 34 (permalink) Old 06-10-2016, 07:14 AM Thread Starter
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Thanks - current thought is that one of the sensors was slightly out of calibration with the other. So awaiting that arriving for them to change it out and try. Hopefully we don't have to change both as that'll be another parts wait!

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post #10 of 34 (permalink) Old 06-22-2016, 06:03 AM Thread Starter
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Just to update and close this off - it was sensors. Whilst the dash was reading right, the one in the rad tested a bit out of sync with the one in the head, so both were swapped out. Problem gone.

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