Is there a way of resetting the ECU to trigger the fan at a lower temp? The reason for asking is I see that the fan is supposed to switch on automatically at 103c. Mine seems to only ever switch on when it hits 108c on the dash which has been frequently recently. So in traffic the dash temp has risen to 116c on hot days this summer which obviously raises some concern. The open road running temp seems consistant at 74-76c. I realise that the bike has 2 temp sensors, 1 for the ECU and one for the dash, could the dash one be inaccurate or is it that there is actually a 5c discrepancy between front and rear cylinders when operating in slow traffic?
I'd suspect the dash reading isn't too accurate, however, if you have seen 116 degrees I'd check the coolant level for signs of loss due to boiling, if no loss then I'd be comfortable. If you see loss then further investigation required, maybe as simple as just replace the sensors
Thanks Harry, I just flushed and changed coolant over the winter, there is no apparent loss so I think all good there. What temperature does your fan come on? I guess the ECU just receives an input from the sensor, then triggers the fan relay so the only adjustment is new sensors, is that correct?
I would take the LCD with a huge pinch of salt. Mine used to jump 5 Deg C when i put on the lights. Since a new loom it is better only 1 or 2 deg C. I would be amazed if the temp sensor was bteer than 5% too I know you could alter the fan kick in on my Triumph but not sure on the Duke
I tested mine not long ago in the shed after service, the fan came on at 105 degC indicated on the LCD, I think that may be the first time the fan has run for aroind 18 years....
Well it is good to know it works then! I hadn't really thought about mine until I switched the relays around under the seat when it cut out very abruptly one day due to the fueling relay, then I promptly got stuck in traffic and it went up to 112c , so I stopped and waited for the traffic to clear and the bike cool down. I then changed both relays at home and it is since then that I have noted the high switching point. So the answer is to not rely on the LCD dash and watch the coolant level, thank you for your very prompt help.
