Sync loss & no tach output

Bob Pendleton · Post by **Bob Pendleton** » Mon Jul 27, 2015 1:51 pm

I just moved from MS2X to MS3X Rel 1.2.4 and TS rel 2.4 and my datalog shows sync loss and my dash tack does not work. I have RPM in TS and all sensors seem to be reading, but tooth logger shows problems.
I am running a boat with GM 4.3L HO, with TBI and Ford EDIS VR and coil LESS the EDIS module. So I am using MS3 base fuel and MS3X spark with JBPERF 4 channel board to fire coil.
Attached are datalogs before noise reduction, tach rejection and input rejection. These seem to help the problem looking at the tooth logger.
So my question is will the VR Pots being adjusted help the issue?
Is there some sensitivity in these settings that is keeping the MS3 from putting out the Tacho signal?
Should I be looking somewhere else?

Bob Pendleton · Post by **Bob Pendleton** » Mon Jul 27, 2015 1:56 pm

Here are 2 more datalogs with noise filter and no filter.

grom_e30 · Post by **grom_e30** » Mon Jul 27, 2015 2:20 pm

i think the pots should help with the noise issue, as to the rev gauge what out put are you driving it from? if its the one on the ms3x did you install the pull up jumper?

Bob Pendleton · Post by **Bob Pendleton** » Tue Jul 28, 2015 10:17 am

Thanks for the help.
Yes I did install the pull up jumper on the #X board, I think it was. If there is more than one - I don't remember but one.
One question - my ECU is pretty inaccessible in the boat - so to adjust the pots do you adjust and then run a tooth decoder and look at the datalog and then repeat? Bob Pendleton.

grom_e30 · Post by **grom_e30** » Tue Jul 28, 2015 1:18 pm

if the ecu is not easy to get to your theory of adjust log and check may be the best solution. your tacho was running fine with ms2?? did you re wire it to the new output on the upper db37 connector? there are 2 jumpers on the ms3x card jp3 is the pull up for the tacho. if it was working before why not use the output that did work and change the settings in the msq to use that output.

Bob Pendleton · Post by **Bob Pendleton** » Tue Jul 28, 2015 2:42 pm

Thanks Grom for the help.
I have checked the manual for the jumpers and have no cam input, so I jumpered only the Tach output pull up.
My tach output for the MS2X was a diy in the proto area and worked pretty well. I would rather not diy the output if I can help it.
I also reset the pots according to the manual and will reinstall and see how the tooth pattern looks.
Is there any way of knowing whether to adjust both pots or just the first and not the second?
Thanks again, and I will keep you posted.
Bob Pendleton.

grom_e30 · Post by **grom_e30** » Tue Jul 28, 2015 3:34 pm

there is a guide on the diyautotunes web site about adjusting the pots.

Bob Pendleton · Post by **Bob Pendleton** » Wed Jul 29, 2015 7:03 am

Thanks, Grom, for the info. I will check it out right now. Bob Pendleton

Bob Pendleton · Post by **Bob Pendleton** » Thu Aug 06, 2015 9:36 am

CurrentTune8-6-15forum.msq

2015-08-05_10.15.01.csv

Thanks Grom, for all

2015-08-05_10.15.42.csv

the help.
I spent several hours trying to adjust sensor and could only make it worse, so I thought I would try another sensor and bought a Hall sensor from DIYAutoTune and have installed it.
But I have no fuel output.
Again I spent several hours adjusting pots and have clean signals, but still no output.
Sync loss is down, but obviously I don't know how to adjust the pots.
See attached msq and logs

Really frustrating.

grom_e30 · Post by **grom_e30** » Thu Aug 06, 2015 11:25 am

from the logs you just posted it looks like you need to change the 'ignition input capture' try falling edge.

Bob Pendleton · Post by **Bob Pendleton** » Fri Aug 07, 2015 8:22 am

Grom, thanks for the help.
Here are more logs. I think I am getting closer, but not there yet.
Tooth logger looks OK but Comp log still not correct - am I right?
I have changed the input capture - to falling.

2015-08-06_17.13.46.csv

2015-08-06_17.13.09.csv

Thanks again. Bob Pendleton.

grom_e30 · Post by **grom_e30** » Fri Aug 07, 2015 9:16 am

the composite log is pretty short but looks ok there is a tiny bit of sync loss at the start(the red marks) for the first rotation of the engine or so but it syncs up ok after that and stays synced for the rest of the log.

Bob Pendleton · Post by **Bob Pendleton** » Fri Aug 07, 2015 10:11 am

Grom, I saw that.
Should I be able to get rid of it totally?
Just adjusted R56 too far and got no Comp log.
Will go back, but will R52 help with the sync loss?
Thanks again. Bob Pendleton

grom_e30 · Post by **grom_e30** » Fri Aug 07, 2015 10:32 am

its quite normal to have a small amount for the first rev of the engine until the the ecu fully syncs up.

Bob Pendleton · Post by **Bob Pendleton** » Fri Aug 07, 2015 12:59 pm

Thanks for all the feedback.
Does the tooth log look OK?
I will try to see if it will fire.Thanks again. Bob Pendleton

grom_e30 · Post by **grom_e30** » Fri Aug 07, 2015 1:29 pm

yeah both looked pretty good

Bob Pendleton · Post by **Bob Pendleton** » Fri Aug 07, 2015 1:51 pm

IT FIRES!!!
Now to make it idle.
R56 set at 4CW and R52 at 2CW with 12V power.
Thanks, Grom, I never would have done it without you.Bob Pendleton.

grom_e30 · Post by **grom_e30** » Fri Aug 07, 2015 2:48 pm

nice one glad you got it sorted.

Megasquirt Support Forum (MSEXTRA)

Sync loss & no tach output

Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output

Re: Sync loss & no tach output