Subaru Igniter

[nismoryco]

Hi,

I was wondering if anyone was using the Subaru igniter (P/N: 22438-AA030, DIS4-03, Hitachi) to drive their wasted spark coils? If so, how are you triggering it with your Megasquirt? According to the FSM, it looks like the factory ECM uses a transistor with the collector tied to 12V with a resistor. It would be easy enough to replicate that circuit but I wouldn't be sure what to use for the pull-up resistor. Does anyone have a suggestion on this? Thanks.

[JWX]

The easiest thing to do would be to "scope" the signal, and then try to get the signal from the MS as close as you can to it.

[nismoryco]

I don't actually have a Subaru to scope. I got the coil pack and igniter from the junkyard for use in my Sentra. I'm planning on going to wasted spark and using a 36-1 wheel. I may just try messing with it until I get it to work. Thanks.

[kay95]

I have looked at the FSM and havent seen a resistor in there. You should only need a logic level signal to it. I was told to use the GM DIS circuit to control that ignitor. It says 3.4V max in the FSM pinout. Though that is what the ECU puts out max.

[nismoryco]

Thank you.