Re: My bizarre & seemingly unsolvable cruise control issues...hoping for new ideas.
EricV said:
New people to this thread, read the thread before you post! All the easy stuff was already checked. They wouldn't have gotten to the point of swapping the entire wire harness w/o checking everything else.
Just for clarification - Sigeye - Did they replace the main ECU or the ABS ECU, (or both), when that was tried much earlier in the process?
I'm not a fan of throwing parts at a problem until you find the fix. But this has been quite a roller coaster for the owner. Much on his own dime. Standard diagnostic procedures have failed to find a smoking gun or lead to fixing the issue.
It would appear that there is an intermittent fault in one of the sub system areas relating to the CC. Which ever part it is, it tests fine. That puts it into the awkward area of swapping in ONE "Known Good Part" at a time and seeing if it alters/corrects the problem. Unfortunately, having a second bike w/o the issue to remove parts from is not conveniently available.
If I was closer, I would arrange to get together with Sigeye and swap one wheel speed sensor/abs sensor at a time and test. That's still one of the most logical items that hasn't actually been replaced previously. These and the VSS wire were my initial suspects. The VSS wire has been ruled out by replacing the entire wiring harness.
One item I don't think anyone has mentioned yet and could possibly be an issues is one of the tone rings on the wheels. These are the magnetic rings that the speed sensors get their signal from. They are pretty durable, but if one is slightly bent or has a scratch, or somehow the magnetic areas were corrupted, that would cause an interruption in the signal that would be enough to drop CC when set.
Have the tone rings been closely inspected prior to this?
Thanks for the interest in helping. I wish I had an easier way to do this too.
The main ECU was replaced with new and did not fix the issue, so Yamaha authorized taking it back (very good of them). The ABS ECU has not been replaced but the tech said he read no codes from it and therefore there were no issues. In hindsight, he would probably dig further if he knew what he knew now.
The wheel sensor components have not been formally 'tested' to my knowledge. Visual inspection does not indicate any problems though.
Now that so many big items have been ruled out, I'm wanting to try tackling the following:
1. Formal testing of all wheel speed sensor components. I can't do this myself so I'm going to have to inquire with the dealer.
2. Potentially just replace All wheel speed components. I might just say heck with it and do this.
3. Replace the left handlebar switch assembly (would be second time I've done this). The pigtail definitely includes some inline resistors and this makes me suspicious.
4. Inquire as to whether or not Yamaha would allow replacement of the ABS ECU and return if it does not fix.
Beyond the above, I can't think of anything else that I can try. So I'm desperately hopeful that those options prove a resolution.
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