is there any way to test the ignition control units in a 00' M750? labelled BB1105, should be the same for all 99-01 carbed motors.
i've been having issues with my Ducati performance tach dancing around at times, and I recently had a random higher throttle power loss, very noticeable, not gradual but like the flick of a switch from one day to the next. I've snugged up the screws on the back of the tach, and crimped down the terminals on the interrupt harness to make perfect contact and that did help a little but didnt solve it. I've tried connecting it to both ignition modules, and on one cyl it only jumps/spikes a little at high throttle around 6k rpms, and on the other cyl it hops around like crazy at any rpm above 3000 (recently found peak ignition timing occurs at 3k) and at any throttle position and seems to do it more often on bumps, but also on smooth roads.
pickup coils test fine, but one is cracked and I just purchased a new set. it's never skipped a beat before though, so this is just a preventative replacement.
ignition coils, plug wires also test perfect, and plugs are brand new and gapped correctly. air filter recently cleaned/oiled, replaced fuel filter to no effect.
pickups are adjusted perfectly for air gap and timing position.
the reason I'm assuming its an ignition module is because I did a lot of part swapping. cracked pickup is on horizontal cylinder. a few months ago I swapped the ignition modules during some other random testing. but after the power loss, the tach was dancing hardcore on the vertical cylinder, and barely on the horizontal cyl. during my parts swapping, nothing had any effect, except when I swapped the ignition modules to the opposite cylinders. once swapped, the tach now dances hardcore on the horizonal cyl and barely at all on the vertical cyl, and I also gained a hair of power back when I swapped them, but not all power is back.
so to reiterate, the ignition module I'm assuming to be bad was originally installed on the cyl with the cracked pickup, then went to the cyl with the good pickup. then 1000 miles later random power loss, and switching the "bad" ignition module back to the cyl with cracked pickup gained a hair of power.
so yeah, any official way to test if the ignition modules are faulty or not, or "within spec" of any type? I can't find anything in the manual or online about it
you tested it exactly how I would have...only other thing I would be generally checking is all the gounding to make sure of no corrosion and good contact/continuity.
yeah, did that, including the coil grounds.
I just tested resistance across the two terminals where the pickups connect, and the module assumed to be faulty tested 1807 ohms, and the module assumed to be good tested 1814 ohms. I didn't check the 3-wire plug yet, kind of nervous to considering there might be micro-diodes on those circuits that I wouldnt want to damage, and thats the power/ground/signal output plug, which would be getting into some fairly heavy sensitive circuitry.
I'm just wondering if I should chance it buying 1 used module, or 2 used modules, or spend the dough and buy 1 or 2 new units from ducati. at $263 per unit brand new though, thats a chunk of change for an old bike, that may or may not even cure the situation
(http://i298.photobucket.com/albums/mm276/hlep2890/img002.jpg)
I have never found this to work though. Best is to substitute with a known good module. Two common causes for module failure are bad ground and disconnecting a spark plug wire with no path to ground.
A bad pick up can cause the same symptoms. Replace the cracked pick up first.
Quote from: howie on July 24, 2012, 12:25:37 PMA bad pick up can cause the same symptoms. Replace the cracked pick up first.
yeah thats my current plan of action. I'll give the above diagram a shot and see what happens. thanks for posting that, I never would have found that.
edit: after examining the above diagram, I concluded that those results will occur whether the ignition module is good or bad, so long as everything on the other ends of the wires is working at all, and as long as the module is putting out a trigger signal at all. sure enough, using that diagram, both my modules tested to have the proper results. which simply means they're working, not necessarily working properly consistently lol. but it was worth a shot, so thank you still :)