Hi guys any one have any ideas on my cooling fans running slow(trickle speed) the stat kicks in at 102 degs but only turns slowly, i found this out 6 hours before riding into France/Germany last week, i had to pull both plugs on the fans and direct wire to the battery via a switch worked fantastic for my 1600 mile return journey, the only problem was to remember to switch them on when riding slow!!!, i will check the voltage this weekend at the fans but not sure what else it could be i also checked the earth to the ECU below the battery that is fine??? might have to go to the big money deposit bank (Ducati) other than that had a fantastic trip B500 in Germany- still smilling- black forest brilliant then return journey via Mulhouse then over the tour de France route back to Reims then home
The fans get their power from a relay on the side of the battery box (right). It's a 4 pin 12v micro relay and cheap to replace. You will find 2 relays at this location. The front one is for the fans, the rear one for the injectors/coils/fuel pump. For the cost I would replace both.
Hi Chris just changed the relay but still not running that fast you can stop the fan with your finger tips, the other fan straight from the battery bloody hurts when you touch it,? Any more ideas, I will say £3.82 inc Vat probably the cheapest thing in the Ducati shop! Graham
Sounds like a supply voltage problem. You need to get a meter out and do some checks. The fans are protected by a 7.5 amp fuse, number 7 in the fuse box. Take the fuse out and see if you have 12v coming into the fuse box with ignition on. Stick a new fuse in whilst you are at it. The relay is configured as follows Switching circuit 30 (R/G wire) +12v from fuse 7 87 (G/W) to ECU -ve trigger The supply voltage comes from pins 85 and 86. (I can't see which way round they are configured but the +12v supply is also R/G wire so you should figure it out). The connection to the fans is a R/Y wire. Test with meter to see if you getting +12v on the wires at 85 and 86. If you are still not getting full power fans then you could try running a 7.5 amp fused supply from the battery to pin 85/86 (depending which way round they are connected). You won't have a voltage drain as the relay will switch it on/off. How are you getting the fans to cut in? Ducatidiag/JPDiag or running up to temp?
Thanks for the info Chris i will check latter, at the moment i have wired the fans direct from the battery via a switch on my steering damper, when i get to about 98 deg i switch it on!! has worked ok for the last 2k in france and germanynow need to get a permanent fix,
Well it looks like they have finally found the problem with my fans running slowly as Chris advised we checked all voltages relays fuses plugs etc put the baby on a Ducati diagnostics tool no error? it seemed to be the ECU? changed that, you guessed it, no change? after messing around with the wiring found a number of wear marks/damaged wires in the loom, rewired temporary it worked a treat now have a new part of the loom fitted, a bit frustrating but it looks like it is now solved, thanks for your help Chris but i was a bit out of my depth with that lot.
behind the right hand side of the battery box, also up from the box left towards the rad, i now remember a couple of years ago i had an engine management light on which was the exup valve wiring behind the right of the battery box. sorry about the pics the guy doing the job has had a nightmare finding the fault, i am picking the bike up tonight so i will ask him a bit more. P.S has the guy with the similar problem on the 1098 found the fault yet?
In a word ....No. Ducati dealer told me it was the ECU. Changed that for a Termi and still the fans run slowly. Ive also changed the relay so that wasn't the problem either. Im actually considering putting a switch on the handle bars, though I'll now check the wiring as mentioned above. Love my bike but I hate it too sometimes!
All the ECU does is supply an earth trigger to the relay. It would be a simple job to check the relay is correctly latching using diagnostic software and a multimeter. The issue is that of voltage supply to the fans and this comes via fuse 7 in the fuse box. If there is a supply issue then again this is easily checkable with a multimeter. Did the dealer not try this?
No not yet....he said there was so many errors on the edu that could not be cleared so i was to change that first. As it happens i managed to get some Scorpion slip ons and a term ecu for £240 on ebay so Ive only just fit it all. I have a multimeter but obviously no diagnostic software. I'll check all the power supply myself and then leave some feedback here. I'm getting fed up handing over £60 every time they plug into my bike and get nowhere! Thanks for all the responses guys
Hi Finm, your quite right about the ECU and the fan, my fault was broken wiring loom, and a dodgy plug which was not supplying the correct voltage to the fan, they just run slow when the kicked in, the guy that looked at my bike was puzzled for several days(seemed like weeks) he still thinks this fault stemmed from a flat battery which i jump started from a power starter he thinks that may have cooked the loom, i have now heard of another 2 bikes that have done the same following a jump start? spooky!
apology's if teaching to suck egg's always check for voltage when component connected. resistance disconnected. :smile:
