Overheating

[Irish in Oz]

@grog
According to manual fan should turn on at 120 degree C and turn off again at 108 degree C.
I just realised I should have said oil temperature sensor goes to ECM.

[Andre]

Light only comes on going slowly sub 50 mph in 20 degrees heat

Certainly not conditions that would cause the engine to overheat. If it does there is a long list of possible causes. Without more info ...

And this info is cheap and easy to obtain! On a K2 ONE office clip gives you the error code! Get that done first!!!

About 15 GBP gets you a screw in oil temp thermometer. Add 15-20 °C to what you see on the thermometer and you have the temp that the fan temperature switch detects. The Suzuki engineers determined that at 120 °C the fan should kick in. So anything below 121 °C at the fan temp switch can't be considered overheating.

Many of the sensors (and there associate wire and connectors - if damaged) can malfunction during normal operating temperatures (could consider normal op-temps as heat). Had that happen on the Gear Position sensor. After it had soaked up enough heat from the engine it caused an error code.

[Hooli]

Correct Andre.
The F1 light maybe be turned on by the Engine Oil Temperature Switch which is connected to the ECM.

I doubt that does it either tbh.

I ran without a working fan for two years, including getting stuck in Switzerland at 37c & my bike got that hot in town that I'm sure I felt it start to nip up. No lights came on at any point.

Seems pointless having the Oil temperature switch (not fan switch) going to ECM to set off a system fault code and not turning on the F1 light to warn of potential problem.

As I understand it the oil temp is used to control the fueling. Richer when cold (like the choke in the old days) & richer again if it gets too hot to help control the temps.

[Irish in Oz]

Exactly my point so if it all goes arse up say 120+ for 1 minute then the F1 light may come on, it all depends on how it is programmed, something I do in industrial process control.
And note the oil/fan switch and oil temp sensor have different ranges but then they are in different positions.

[Irish in Oz]

This is this guy's first post so my questions:
1. Have you just purchased the bike.
2. If not was the HEL radiator on it or has this problem occurred after it being installed.

Instead of going through a load of diagnostics that have no relevance.

[Andre]

@Irish in Oz

Putting it into dealer mode to get the error code is of high diagnostic relevance and easier than eating a piece of pie

[Irish in Oz]

And if it has more than one error code!

[AndyPillatt8841]

I've had the bike a couple of years. Hel rad was already on it. Was all ok until this season. I need to put it in dealer mode but still not found the socket.

[Andre]

It is a white plug which is supposed to have a black dust cap on it. Located to the left of the battery and ECU. Have to take the little storage tray out.

[GSX1400Convert]

Not sure if my fan has ever come on. Have ridden some very hot days, traffic included. Never seen above 85 degrees on temp gauge which is fairly accurate to what laser thermometer reads. Love that air/oil cooled set up.

I have no fan whatso ever. Even riding in 46 degree days, my fan has never come on 

[KiwiCol]

Well it wouldn't, would it?    You haven't got one 

[Hooli]

Exactly my point so if it all goes arse up say 120+ for 1 minute then the F1 light may come on, it all depends on how it is programmed, something I do in industrial process control.
And note the oil/fan switch and oil temp sensor have different ranges but then they are in different positions.

I do get your point. It's just I know from experience that mine was well over 'fan temp' for 10-15mins while I managed to get out whatever city I was in, with no working fan & it didn't show a FI light.

[Eric GSX1400K3]

Exactly my point so if it all goes arse up say 120+ for 1 minute then the F1 light may come on, it all depends on how it is programmed, something I do in industrial process control.
And note the oil/fan switch and oil temp sensor have different ranges but then they are in different positions.

I do get your point. It's just I know from experience that mine was well over 'fan temp' for 10-15mins while I managed to get out whatever city I was in, with no working fan & it didn't show a FI light.

Maybe your fan AND F1 light is broken 

[Irish in Oz]

The F1 System chart attached shows the sensor voltage range.
If a sensor goes open circuit (below the shown voltage) or goes short circuit (above the shown voltage) the F1 light comes on and the error will be be logged for dealer mode and the light will stay ON.
If the sensor isn't damaged and goes momentarily out of range (for example over temp) the F1 light should come ON and if returns within range I see no reason why it shouldn't turn OFF, the malfunction should still be logged.

[GSXKING]

It gets pretty hot in and around Brisbane in summer and I've never heard the fan come on either. It's so small I can't imagine it would do much if anything at all. Just my 2 cents worth.