Megashift working with a few bugs
Megashift working with a few bugs
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- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Megashift working with a few bugs
Few things can force manual mode (as opposed to force auto mode, which has a number of settings).
Having either of the shift buttons grounded can do it, even though this may be brief and accidental. The best bet if you want to force auto-mode at all times is to tie the upshift and downshift button leads (Amp 15 and Amp 4) to 5 Volts (such as Vref on Amp 28). As a work-around, you might increase the shift button duration: http://www.msgpio.com/manuals/mshift/V5tune.html#gs under Shift Factors
Sometimes if the shift tables are not identical, accidentally using the wrong table (due to grounding or un-grounding of the 4WD switch lead) can lead to no shifts so that it feels like manual mode.
Having the shift table set up so that shifts would exceed the rpm limits will also feel like manual mode had been engaged.
But it's hard to say anything specific without a datalog and a settings (msq) file.
Lance.
Re: Megashift working with a few bugs
Re: Megashift working with a few bugs
- Attachments
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- 2015-08-09_12.38.11.msllog1.msl
- (631.79 KiB) Downloaded 467 times
Re: Megashift working with a few bugs
- Attachments
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- 2015-08-09_14.36.41.msllog3.msl
- shorter file with manual mode coming on by itself
- (89.96 KiB) Downloaded 454 times
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- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Megashift working with a few bugs
I have asked the forum admin team to increase the file attachment limit from 1 MB to 5 MB per attachment, so you might try re-uploading the log in a little while.
You might also check this post for editing logs to make them shorter: viewtopic.php?f=4&t=1017&p=5500#p5492
One more thing to check when you have problems only under high loads, etc. is that you have very good grounds, as 'iffy' grounds can cause exactly the sort of issues you are seeing.
Lance.
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- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Megashift working with a few bugs
It looks from the second log that the downshift button (DWN in the log) has been grounded from 50.390 seconds until 57.219 seconds. Not surprisingly, that provokes manual mode.
The question is if this was an actual grounding of the down button circuit, or something else. One hint is in the aux channel voltage which is a separate circuit. Curiously, it rises from 0.700 Volts to as much as 2.7 Volts during the same time the downshift button is supposedly pressed, and this suggests to me that either the grounds are suspect, or there is an issue on the board somewhere. The downshift button returning to normal appears to coincide with the pressing of the brakes which again suggests a ground or board issue.
There are also a number of VSS resets at the point at which the button shows as grounded.
That doesn't mean that there isn't issues in the code; there may be and I will have a look on my bench. But the above clues, plus the fact that it happen only under specific circumstances (driving aggressively) suggest a wiring or board issue. So while I look closer on my bench, you might want to have a look at your grounds and your board to make sure these are correctly configured. I would start by making sure that the resistance from my board to the battery's negative terminal is 1.0 Ohm or less.
Lance.
Re: Megashift working with a few bugs
Re: Megashift working with a few bugs
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- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: Megashift working with a few bugs
It's unlikely the DRAC is causing problems, unless it is defective (which is possible, of course). You could try by-passing it, I suppose.
If this was mine I would also check the grounds for the alternator and engine to the battery, as ground issues there can cause what seem like ground issues in unattached devices.
It may also be that the 12V supply is very noisy (for any number of reasons), and this is causing the issues you see. In that case, you can put a car stereo power filter in the 12V feed to the GPIO board. Normally this is put in place for reset issues, but it can also solve some problems that are significant enough to cause the sort of issue you see, but not quite big enough to cause resets. There is more information here: http://www.megamanual.com/ms2/tune.htm#resets
Did you try increasing the 'shift button duration' setting? You can set it as high as 1000, and that's what I recommend for you.
Lance.