MS11 Sync error 10
Turbo Mini Forums

Gents,
I’m hoping that someone can give a bit of guidance...

I started getting sync errors about 3 weeks ago, sync error reason 2 mainly, but with the occasional sync error 1 thrown into the mix.

This has now turned into sync error 10, followed by sync error 12, no more Sync error 1’s.

0 = no problem
1 = init error
2 = missing tooth at wrong time
3 = too many teeth before missing tooth (last)
4 = too few teeth before missing tooth (last)
5 = 1st tooth failed test
6 = nonsense input (last)
7 = nonsense input (mid)
8 = too many teeth before missing tooth (mid)
9 = too few teeth before missing tooth (mid)
10 = too many teeth before end of sequence
11 = too few teeth before second trigger
12 = too many sync errors
13 = dizzy wrong edge
14 = trigger return vane size
15 = EDIS
16 = EDIS
17 = didn't received the second trigger when expected in wheel mode

The errors are only occurring from tick over to approximately 2900RPM, load does not appear to influence the errors. Over 2900RPM(ish, The engine runs fine.

So far I have:
replaced all spark plugs with new resistive type plugs.
replaced HT leads with new resistive type
Replaced the coil pack with a spanking new one
Turned on basic filtering in TunerStudio.

None of the above have worked.

The next steps will be rewiring the VR sensor back to the MS11 and/ or replacing the VR sensor.
I have a new VR sensor, but this is the short version. I currently have the longer version on the car.
I expect the difference in VR sensors to cause me problems as I suspect I will need to mess around the MS11 pots to get sync – something I don’t relish.

Equally rewiring from the VR sensor back to the MS11 will be a balls ache.

So before I undertake either of the above, can anyone give some words of wisdom?
Below is a screen shot, showing what is happening.






Thanks

Graham

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

Is the VR cable screened and running well away from coil signal wires all the way to the ecu plug? *take it out of the bundle coming out of the plug if it is all together. Do you have supressors on the coil pack?

I have a misfire but only when tunerstudio i connected, but I think its a wrong inf file version causing a coms crash, but it does lose the VR signal momentarily. There is a thread on microsquirt.com if that fits the bill.

There have been comments about the last but one release of the Extra code causing sync problems - are you on the absolute latest ??? (or better still, back on one of the well known working ones for those of us on siamese).

But, code apart, it looks like hardware but strange for it to have started happening after many months of OK (unless associated with a code upgrade).

Re. Jamie, the Microsquirt has the same crap VR circuitry as the V3.0 MS2 mainboard, which is whyI wouldn't touch the Microsquirt module for my own project.

Personally I now really hate the standard VR circuitry and will never use it again.

The alternative MS2-Extra circuitry (same as Jeans original VR board) is far better and I've used Jean's latest dual VR board (on the "build manual" thread) and it seems much better.


Graham,

If you want to borrow my spare MS2 (with Jean's dual VR board) to eliminate the VR circuitry, let me know.

It won't be for a couple of days as I'm currently setting it up to test the new IOx-OEM functions and does need one connection changed in your wiring loom (because the VR comes in true +/- instead of +/GND).

You can't borrow my "other" one as it has a completey different connector :)


Let me know.

Schrödinger's cat - so which one am I ???

Jamie,
Yes it is screened and well away from all other wiring until it reaches the DB37 plug. It's been fine until now.
I’ve not got suppressors on the coil pack, it’s never seemed to need it.

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

No luck with the code changes. I've flashed both 3.1.1 and 303x to the MS11.
Neither have eliminated the sync error.
I’ll find some time tomorrow night to change out the cable and the VR sensor.
I really want to get the mini to MiTP, rather than going by bike…

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

While the pots should not move, they are still mechanical devices and there might also be some oxidation so if they were on the threshold of the functional position it might now have gone across that threshold.

It would not be a bad idea to just turn them one turn away from where they are in both direction to see if that makes any difference. And try readjusting them if just going back and forth does not help.

And like Rod, I'm not a fan of that circuit.

Jean

http://www.jbperf.com/

Yeah I'm not a fan of that VR circuit either,

my solution was to run a hall switch from a rover 25 straight into the opto isolator, which then feeds straight into the processor, all you need to do is scale the input resistor to the opto isolator so you dont cook it.