When I first assembled my board (v3), I played around with the "output test mode" to see if everything was good. When I tested the injectors, both banks worked properly.
Now, after figuring out a different problem (no RPM) I went to try to start my car, and was not getting fuel. Going back to the stim I now see that only my INJ2 bank fires, the INJ1 does nothing. I have voltage on the INJ1 LED, so I know I have power to the injectors, which means it must not be grounding bank 1 properly...
I don't really know what to test, I've done a bunch of reading, tested voltage all over the circuit and everything seems to be ok from what I can see. Also, I'm sure the LED on the stim works, when I jump it to bank 2 it blinks.
I am running staged injection if it matters. (Although that shouldn't affect output test mode).

Does anyone know of anything specific I can test? Any ideas on why it worked before, but not now?

Thanks in advance

 

Have you tested the full path from the putput pin of the CPU all the way to the base of the drive transistor? A scope is best for this.

 

Does anyone have a schematic I could use for this? I can't seem to find anything good for the Injector driver circuit.
Also Aaron, if I were to test this with a DMM first, what setting should I have it on, DC volts or AC?
I can (sometimes) get ahold of a scope, but not easily because the one I use is in a university research lab where there's people trying to work on projects that are actually related to that research :P

 

The other schematics and descriptions on how the circuits work are here:

http://www.megamanual.com/ms2/pcb.htm

For this kind of work you really need a scope since you are tracing a signal. A VM set to DC probably would not respond fast enough to be very helpful.

 

I had an appointment to get ahold of a scope tomorrow, but earlier today I found a small piece of solder in between two pins of Q14. I guess it was grounding out the signal.
Both injectors are working again!
Thanks for your help!