It's one of the FETs built on the proto area. you can figure it out by probing the top solder blob -- or the middle leg -- back to the #4 injector at 2J on the oe ecu connector.

 

Thank you.

Now that you say that it makes sense, I should have figured that relationship out.

Much more crowded in that area to remove and install, going to be fun.

Are the injector chips on the board all a bad batch, should I just swap the others as well, or is this a rare double failure on the same build?

 

no clue, bad luck?

you could rebuild the whole thing and play it safe. it's like $10 in parts.





this is how I used to build them.

 

I did buy 4 chips when my 1st one went bad.

I'll probably replace all after I try your tips here and in PM

thanks

 

The picture i took prior to desoldering wasnt clear enough. I'm not sure which diode goes together with the injector chip - oops.

Here is where Im at

 

Replace all four while at it. That particular VND turned out to be unreliable. We haven't used one since late 2011.

 

I threw it together with just the #4 replaced. Runs like it should.
I'll replace the entire proto board one of these days. It's tight in there when compared to the chip out on the main board.

Thanks again for all the help !!