CB1100 Idle speed instability problem

[Speed_imp]

Here's your stepper motor diagram Speed;



See what happens when you connect a 9v battery across the scope probes and then connect it in reverse, the trace reverts to the centerline instead of remaining in the positive section and the scope makes you think there is a 24v signal, which is why Lord popgun asked you:"how exactly have you connected the probe" meaning: pulses with respect to what? ground or the other side of the coil?.

The windings are reversed because if you reverse the magnetic field you also push the rotor and pull with the other coil.

The use of "the force" is then greater which explains perfectly why we have rlets on our bikes

Thanks I have been looking for it. So it looks both leads of a same coil are alternatively switching from 12V to ground, it explains why in reference to ground are positive 12V pulses and measuring at the endpoints of each coil (Bl/O to Bl/Y) voltage goes from -12V to 12V which is what the coil is receiving. That is how I measured the signal of the photo



and measuring between Bl/O and Bl/Y where I can find a 105 Ohm resistance



Actually I measured both leads in reference to ground and they both give 12V pulses (alternatively)

I can't say for sure, maybe Max or someone can expose on that, Speed. It would be nice to see a detailed schematic of the ECU and all, but that ain't happening. Could just be the ground reference. I can make some good guesses, but without more info it is kind of pointless. I doubt either of the lines is ground, but rather one line is HI the other LOW, maybe from a differential driver, IDK.

The main purpose of this exercise is to see if your results are the same or different tha a bike that is working. So far they are the same. when measured the same.

I just tried to send you the 5min file, but it is 30.9MB and the mail says it is too big. Anybody have any ideas?

Thanks for that Max! Now I know I should have just put the ground leads on the RLETS

Yes it was the ground reference what was making me crazy, didn't know both leads of a same coil are alternating the 12V output as the rotor of the valve also alternates the poles of the magnets while turning I suppose. You can reduce the size of a video by converting it to MP4 for example in this website: https://www.videosmaller.com

I can't say for sure, maybe Max or someone can expose on that, Speed. It would be nice to see a detailed schematic of the ECU and all, but that ain't happening. Could just be the ground reference. I can make some good guesses, but without more info it is kind of pointless. I doubt either of the lines is ground, but rather one line is HI the other LOW, maybe from a differential driver, IDK.

The main purpose of this exercise is to see if your results are the same or different tha a bike that is working. So far they are the same. when measured the same.

I just tried to send you the 5min file, but it is 30.9MB and the mail says it is too big. Anybody have any ideas?

Thanks for that Max! Now I know I should have just put the ground leads on the RLETS

Do you and speed have DropBox?

Do you and speed have DropBox?
I don't have dropbox neither.