it wont be doing anything. as its kind of like a ring main, take one component out, circuit broken. depending on the system it probably wont start. the thing about can is it has two wires running a mirror image of the digital signal, can high can low so if one wire breaks it still operates. most modern cars have many can systems. high speed can for the likes of safety systems/engine management. low speed can for comfort systems. a very reliable system. don't think any dealer ship will be able to decode with a scope altho you can check its sending a signal, but you can check with a multimeter as the can system has a termination resistance..
finm, some of thats incorrect. You can unplug the suspension ecu and the bike will turn on and fire up, obviously with warnings, but the engine ecu will communicate with the display ecu just fine, and the hands free will also work too. Should anyone want to dick around with this, I would suggest buying a cheap CAN to USB interface for your laptop and getting a copy of wireshark software. If you know what the data should look like you can set up data filters to tag what you are seeing. You can then listen to all the traffic to your hearts content, the can bus is presented at the diagnostics socket I havent played with the Ducati diagnostics device (dealers get funny about customers playing with their kit ;-p). i would assume that the dealers are working on the basis that they cannot communicate with it. Or of course, it might be reporting fault codes. Something really screwy has happened for all of these things on your bike to go wrong at the same time. To me it sounds like your fixing the consequences, and not the actual cause of the problem itself. What part of the suspension doesnt work - preload, or compression / rebound ? if you unplug the suspension ecu with bike turned off (battery disconnected), and then replug it, it should go through an initialisation routine, which determines the limits of the steppers. I did this with mine when I had the preload unit rebuilt.
Hmmm! Interesting stuff. I agree with you about consequences and perhaps not root cause! Bike's with the dealer right now so no chance to play with it. From what the Service manager was saying the rear shock was totally unresponsive.
I agree with John; for multiple, unrelated systems to all go offline at the same time, I'd expect a very simple hardware fault with the CAN bus itself. If, for example, CANL gets shorted to ground, then this establishes what's known as a 'dominant state' on the bus, and no devices can communicate. That's not a 'high tech' fault, it's a good, old fashioned wire chafing through the insulation and rubbing on the frame. The only difference is that if it's, say, a headlamp wire that gets shorted, then it's pretty obvious what's going on. With a CAN wire getting shorted, the whole system dies, and it takes specialist equipment, knowledge and skills to find the fault. If the bike were mine, and out of warranty, I'd have it hooked up to a 'scope via the diagnostics connector, and I'd look at not just the voltage levels on the CAN interface, but also which devices respond and which don't.
coolio is the suspension and engine on same can system? let me give you an example. remove a sterio from a punto or land drover and the fecker wont start. thats just two vehicles i know of with out thinking to hard. been 6years since i done a can coarse so just working from me gold fish memory. :smile:
i can only base my forum contribution on what i read on here and my experience out there.(in the real world). where diagnostic costs can be prohibitive. without blowing my trumpet too much read back a few post and you will see i suggested suspension unit. that came from another forum long time ago. the symptoms come from experience. lots and usually fixed for pennies. living in argyll. i tend to see a lot of water ingress faults.
If all aspects of the shock are unresponsive, it's the controller, not the shock. The shock compression and rebound are simple stepper motors, nothing fancy with them. Even the rebound is nothing fancy, just a bit meatier as it uses hydraulics to do the job. All three are isolated electrically from each other. To have all three go wrong independant of the controller is highly unlikely. Just a thought - this bike has not been totally under water has it ? It sounds more likely to me that the bike is fitted with a non sport ecu, or at least flashed as one. I would be looking to swap the ecu and / or shock with a known good one, to see what gives. By the way, I am a CAN developer. I have used CAN for various projects over the last god knows how many years for space, aeronautics, military, and automotive. I developed a data logger used by the MoD on their Ladd based vehicle fleet, and this specifically records and analyses j1939 can bus traffic. So I know more than a little about this stuff Having said that, always happen to be proven wrong and learn from someone who knows better
you shouldn't really wish you hadn't all knowledge should be welcomed but sometimes some know more than others which is also welcomed johns post I'm sure isn't a put down but merely highlights his knowledge thats the beauty of the forum
totally i hoped the smile gave it away, i am at the dirty end of electrics cost over outcome. the average joe has to diagnose without wiring diagrams, location diagrams and fictional descriptions. my most understanding customer is a radar tech he has helped me occasionally and recons cars are no less complex than the fighter planes he is used to working on. but are expected to have a lot less maintenance.i also know one or two guys at the top who know considerably more than me. but hay i am here to learn not to judge.
Will do for sure. And thanks to all for contributions - if nothing else, very enlightening and often entertaining! BTW, I can't say for sure that the rear shock was completely unresponsive. I was just given that impression by the service manager. He didn't say THAT specifically. Just something like, "rear shock's not working". So yeah, fecking new shock didn't arrive at dealer today so it's getting REALLY tight re my Saturday departure. Gonna put new tyres on the old 'Blade tomorrow in case I have to take that!! Interesting Tidbit, breakdown insurance for '93 blade is almost twice the price of 2010 Mutley. So it seems the RAC have faith in Ducatis even if mine is a little tested right now!
I only just picked up on this thread. It confirms what I've always suspected - an MTS without a warranty is an "interesting" proposition... :Greedy::Greedy::Greedy:
UPDATE: OK, so I picked up the bike today and have put about 80 miles on it. Everything seems absolutely fine. Of course this has all been in dry sunny weather. As I'm headed for Italy tomorrow I simulated a shower by sprinkling the bike with a garden hose (admittedly pretty gently) for about 10 minutes. I'm going to let that soak overnight and we'll see if disaster ensues tomorrow!!
Mmmmm....it's rather depressing to think this is what we're coming to - Trade in the bike just before the warranty expires (no matter how much you love it) or foot the bill when it all goes tits-up!
