should be pin 33.

 

Spark B is top connector, bottom row, pin 33

Looking at it from behind, 5th from left

(Pin reference is based on the tiny stamped numbers on the megasquirt side)

 

edit: interpreted incorrectly

 

no, i was saying spark b should be pin 33--so the MS harness is correct.

All the sparks are driven off the same integrated circuit on the expander, I'd be hard pressed to think Spark A is working, yet Spark B is not.

 

Spark C and D are dormant if using wasted spark?

If not, and Spark A and C are firing at the same time, maybe I can switch the trigger source to run wasted/batch. But that probably means I'll never be able to run sequential.

Anything on the megasquirt itself to check whether it be software or hardware?

 

on a 4-cyl, yes.

IIRC it's wired:

A - 2/3
B - 1/4


You're absolutely certain in output test mode you can't get anything when testing spark b? and that spark b goes all the way from the coil trigger (yellow or yellow/brown) back to pin 33?

 

Both cylinder 2 and 3 fire when I test Spark B OR D in output test

Nothing happens for cylinder 1 and 4 when trying Spark A or C

Continuity is good from the coil plug all the way to the ECU pin for both Ignitor wires: Brown and Brown/yellow

 

okay, sorry, so it's spark a not working... hmmm.

 

So from what you said earlier, there shouldn't be any reason why Spark A isn't working if Spark B/D are.

So that means it would have no effect if switching to Wasted COP, activated Spark-A/C and Spark-B/D simultaneously, to try to use Spark C as the trigger instead of wiring to A?

I don't understand the logic if that would work, yet Spark A doesn't work independently if they are part of the same integrated circuit.

ಥ_ಥ

 

im curious as to why Spark D is doing anything...Did you wire Spark D from your center connector into your cop harness?

 

Spark D is run to one of the unused wires in the modified ignitor, but not actually wired to anything. I wasn't sure of why it did anything when cycling through the output, if it was set to wasted spark. It makes me wonder if this was to allow for a wasted setup to work even if the COPS are wired for sequential...without shifting or pairing wires as we do for the 1.6L

..but again, does not explain why A and C aren't working.

I feel like I'm missing something real stupid in the setup within MS. Patiently waiting for that "eureka" moment once it's all sorted...but I feel in over my head now. Swap and install only took 1 day. Figuring out how to start the car....5 days and counting.

 

post this over at msextra.com, cause i'm missing that moment as well.

 

Just set up an account but waiting for admin approval for first post. I'm really desperate to the point where I wonder what it'll take to get this running on MS1.

 

From reading this thread:
Megasquirt MSEXTRA / MS3EFI • D14 "spark A" Not Working- Not Grounding - MS2/Extra v3.0 (View topic)

I know it's MS2, but is this something common that even new daughter boards or expansion boards are sometimes faulty?