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-   -   MS1 to MS3, no spark (https://www.miataturbo.net/megasquirt-18/ms1-ms3-no-spark-65014/)

botte 04-10-2012 07:59 AM

MS1 to MS3, no spark

I am upgradeing ma MS1 with a nes MS3 board, without the MS3X
I also changed the wiring like it was described here, and I also added the 12V to the MS3 board
But I cannot get any spark, fuel looks OK
Any Ideas?

Braineack 04-10-2012 08:52 AM

you need to change more than just 12v to js9.

what specifically did you do?

botte 04-10-2012 08:58 AM

1 Attachment(s)

I just forget, I have a 90 with a 1,8 engine,

I changend:

opened xg1 to xg2
connected Tachselect to XG1
opened D1 jumper
opened D2 jumper
connected 5V to c30, and with 470 Ohm top JS10
connected js10 to IAC1A
I crossed both ignition wires.


Matt Cramer 04-10-2012 09:33 AM

Do you have an RPM signal when you crank it?

botte 04-10-2012 09:55 AM

No rpm.

Braineack 04-10-2012 10:08 AM

the green wire to iac1A goes to js10 as well? looks like js11.

botte 04-10-2012 10:15 AM

It is JS10,
JS11 is empty, it is just a little bend cable.

Braineack 04-10-2012 10:25 AM

youre not on c30. your green wire to 5v is off a pin. it's going to r4 or r7 or whtaever; one of the resistors basically.

botte 04-10-2012 10:31 AM

I need to take better pictures. :-)

It is connected to C30 (next to the C32 pin)

Braineack 04-10-2012 10:34 AM

i'd look again. to be sure. that's definitely connected to one of the input resistors, not c30. that's the pullup for the crank input, so I could see why it wouldn't start.

botte 04-10-2012 10:38 AM

4 Attachment(s)
Ok, Is this the correct pin?


Braineack 04-10-2012 10:44 AM

:( yeah, it is.

can you post a screenshot of the composite log recorded during cranking for about 10-15 seconds?

botte 04-10-2012 10:52 AM

There is no output in the composite log window.
Its just stayz black when I started the log.

My fault, output should be set right. ( JS10 spark)
Here is is:


botte 04-11-2012 05:33 AM

As this did not work,
and I found another thread where someone olso had the same issue,
I wired everythink back as it was before.
(only the ign wire are still crossed, and the additional 12V to the MS3 board are there)

But I only get tons of fuel per squirt and no ignition.
RPM are there when cranking.

What settings should I use with this setting, I am getting confused now.

Braineack 04-11-2012 08:27 AM

i cant see the pic, can you attach it to your post so it gets hosted here.

might as well post the msq too.

botte 04-12-2012 04:26 AM

2 Attachment(s)
Here we go:

Comp logger with the modification:

Lots of sync errors.

After I removed the mod again:

Comp logger:

I am missing a signal from the crankshaft right?

here is the msq:

Braineack 04-12-2012 08:39 AM

the top one is completely random and doesn't make sense as far as the inputs go.

the bottom one makes sense when it comes to the crank (it's how it should look), but there's no cam input.

what "mod" did you remove?

botte 04-12-2012 08:48 AM

The top one was done with this here:
this mod:

The lower one is done with this setup:

Ben 04-12-2012 08:57 AM


Originally Posted by botte (Post 861925)
My fault, output should be set right. ( JS10 spark)

If you're using JS10 for spark A output, what pin are you using for your 2nd trigger (cam) input?

botte 04-12-2012 09:02 AM

My CAS is connected to pin24(crank) and pin25(cam)

OK, found on the upgrade note
that spark should be set to LEDout.
-> Spark A,B,C are available on the LEDs (not FIDLE)

Non-MS3X Cam Input
If you do not have the MS3X card, but need a cam input then a little more creativity is required.

If your cam sensor is VR type then you will have to DIY a second VR conditioner circuit - see the MS2/Extra manuals for DIY ideas on this.
If you cam sensor is hall or opto, then you may be able to use the 'spare' opto-isolator input on the V3.0/V3.57 mainboard and route it to JS10 for your cam input. This will be documented in the future.

Does this mean I cannot try the VR input + pullup method described here:
I wanted to try this out tomorrow to get the missing cam input.

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