No CAS input (no spark etc)
 

Hi everybody,

I was wondering if I could get some assistance with a issue I am having with my Megasquirt 2.

I recently got it upgraded from a MS1 to MS2 with a few extras like sequential fueling, launch control, boost control, switchable maps and light output.

I have just fitted it and with the test mode found I can get spark and I can get the injectors to fire plus the fuel pump works good as well.

The ECU knows when its cranking however I am getting no spark when cranking, I have taken a log and found my RPM goes from 0 - 200 (approx) while cranking.

From my research this indicates a CAS error and I do have a sync count and sync error.

I have 19 sync errors in the log below with the error reason being 39 which I have found is 4G63 - pattern does not match.

Below I have also included a composite log and a tooth log which I recorded on three different cranking attemps.


I also have it set to falling edge which I am pretty sure is correct and even if it was wrong I should still get spark so I really dont have a idea what the problem could be. Any help would be greatly appriciated.

- Sam

let me look at home, you probably just need to change the cam polarity.

Thanks brain, I have just changed the trigger settings to rising edge and got more logs just to see if that sorted the pattern which it didn't as it still don't start but it was worth a try.

what firmware are you using?

iirc the newest lets to pick the polarity of the cam.

I think it was like V3.3.3 dated like 2014 does that help?

So your confident from that composite log its just backwards then essentially?

I just created a TS project using the latest 3.4 firmware and looked at the trigger settings and found the "Flip polarity of cam" setting.

Before I upgrade can you confirm that this should fix it I dont wanna take a risk of messing anything up thats all.

very big thank you for your help so far though.

you logs dont work when i try to open them.

you need to crank for like 20-30sec.

Seems like awful long time, plus I think ill end up making the battery go dead, I can show a screen shot of the patterns both falling and rising edge.


https://www.miataturbo.net/attachmen...ine=1440148239




RPM drop because of lost sync


https://www.miataturbo.net/attachmen...ine=1440148239


Rising edge pattern


https://www.miataturbo.net/attachmen...ine=1440148239


Falling edge pattern

How do you have the RPM input circuits built?

im going to assume he has regular MS1 mods.

so crank going through the opto, and cam going directly into js10 with a pullup.

I don't know since I didn't build the ECU my self I sent my MS1 which was built by a unknown to Phil at ExtraEFI.co.uk

He upgraded it to a MS2 with a MS2X card since I got sequentially fueling, launch, boost, switchable maps and a programmable output added all on the 15 pin options plug.

He also said he fixed a few things as well as it didn't look that great inside, I am going to go quickly upgrade my firmware to 3.4.4 so I have the flip polarity setting and take another log with it inverted.

Hopefully thats all I need to start it since it is getting a signal its just not correct.

Phil built it for a MK1 MX5 1990 since thats what I have, So I would imagine he done it correctly.

So I have upgraded to v3.4 restored my tune and inverted the polairty but it still wont start.
https://www.miataturbo.net/attachmen...ine=1440164369


This is my pattern with the polarity inverted as you can see its still not right. (log attached)


https://www.miataturbo.net/attachmen...ine=1440164369


I got my friend Alex to take a log of his signal pattern and I am guessing this is what mine needs to look like.


I also attached my current tune just incase it makes a differents, its not set for my injector size yet but that does not matter I'm guessing for the meanwhile til I actually get it trying to start.

Anybody have a idea what might be causing this? I'm really stuck now after the cam polarity not fixing it I just don't know what to try or where to start...

there's a change between ms1 and ms2 between the polarity requirements of the signals. I assumed the latest firmware made it so it didnt matter and you could change the cam polarity in relation to the crank in software. I really have only just seen the option and havent read on it.

otherwise when I was upgrading ms1 to ms2 in the past I was making modifications to the mods on the board itself. i was trying to prevent you from having to solder if it wasnt necessary.

What would I need to look for to know if I have the correct changes?

I have emailed Phil with the same information and hopefully he can confirm exactly what has happened.

what does your log look like with the cam polarity set to normal?

Let me go get a quick log as I think I only took a log earlier of it inverted

The netbook needs to charge quickly but before I go down the ignition input capture should be Falling edge correct? because on my MS1 map its Rising edge.

Okay I got 4 logs all with different settings.

Attached is 1 log with the settings Falling edge with polarity normal
Another is Rising edge with polarity normal
third is Falling edge with polarity inverted
and lastly Rising edge with polarity inverted

Once again thank you for helping me try to figuire this out.

Just incase your at work etc and havnt got Megalog viewer to hand here are some pictures:


https://www.miataturbo.net/attachmen...ine=1440185930


Falling edge, cam normal


https://www.miataturbo.net/attachmen...ine=1440185930


Rising edge, cam normal


https://www.miataturbo.net/attachmen...ine=1440185930




Falling edge, cam inverted


https://www.miataturbo.net/attachmen...ine=1440185930


Rising edge, cam inverted.

When I compare the green pattern to Alex's green pattern mine is symetrical and his isnt making it seem like I am missing a mark/tooth (i dunno)

Right so I got a reply from Phil regarding the logs:

I have replied and sent him the 4 logs where its rising edge, cam inverted and the other 3 ect to see what he says.

Is it possible I might have a faulty CAS?

So I just got a reply back from Phil again:

So I am gonna swap the CAS over tomorrow and fit a fresh O-ring and hope for the best really... I suppose its possible the CAS got damage when fitting the engine and It may have hit the fire wall but I doubt it.

No CAS input (no spark etc)
 

His looks nb. I think you just need to mod the board. Will post the steps later.

His is a MK1 BBR turbo just with a MS2 instead of the stock BBR ECU since it decided to die on him.

And thanks Brain, I wont mod it my self what I'll do is relay the information to Phil and get his opinion since he built it of course.

So I swapped over the CAS today and no luck at all I took another log and its exactly the same and according to Phil its close but literally a few degress off which annoying.

He asked for me to open the ECU and send him pictures as he always uses a opto circuit on MX5's however he has had a few cases where a VR circuit has been needed instead which I find odd since from what I have read VR was only introduced from MS2 onwards so my MS1 wouldn't of been using VR it would have used opto and that worked, badly but it worked hence the upgrade since I had surging issues.

Anyways I have attached the images for you guys to also take a gander at:


https://www.miataturbo.net/attachmen...ine=1440337347


https://www.miataturbo.net/attachmen...ine=1440337347


https://www.miataturbo.net/attachmen...ine=1440337347


https://www.miataturbo.net/attachmen...ine=1440337347


https://www.miataturbo.net/attachmen...ine=1440337347


https://www.miataturbo.net/attachmen...ine=1440337347

No CAS input (no spark etc)
 

Need to see bottom of the blue board.

All that wiring and no flyback on the idle fet...

Okay I got a reply from Phil and basically he is asking me to remove two links and add two wires, I am not sure what this is actually going to do but he said just to try it again after that.

Just to keep you updated here is the pictures he sent me:


https://www.miataturbo.net/attachmen...ine=1440370473


And remove these links.


https://www.miataturbo.net/attachmen...ine=1440370473


I have to add these wires.


Does anyone actually have a idea what I am doing here?

Figuire out that basically I am adding hall sensor support for the 4g63 cas, which seems partially done all I am doing is finishing it off in a sense. any reccomendations for soldering iron and wire gauge I should use?

getting a new iron since i let someone borrow mine and well they decided to utterly fuck it...

see attachment.

and look at this post: https://www.miataturbo.net/megasquir...94/#post940609

Ahh brilliant thank you brain, so basically Phil forgot to update my board when upgrading to MS2 atleast on that side of things.

Atleast that pretty much confirms that I should be good to start the car tomorrow or atleast progress to the next stage atleast!