MSefi.com read only forum (Jan.15,2018)

I think I had some sort of cold solder joint on Q1 & Q5. Reflowed the solder and it's much more stable, and making better contact w/ the heat sink. Still kinda surprised these don't have a screw down to the heat sink like the others.

Or I might have a cold solder joint on those connections...

I put this thing back on the car to further try to diagnose it and it started and worked fine...for about an hour of run time or so, then started to do the exact same thing, AFR's on the gauge went way lean, then it died out, pretty sure the injector circuit went bye-bye again...so I'm thinking this ...

Okay I checked over the MS with the oscope tonite and I dont think I could find any smoking guns. I basically probed the 2 injection circuits at the corresponding components and compared the waveforms. I went about this in a semi-random manner, selecting components that were easily probed on the ...

Yeah, I'm sorry about that Lance, just there are about 1,847,783,371 locations to check in the MS documentation, and when you factor in all the differences in MS1, MS2, MS3, base B&G code, MS Extra, Megatune, Tunerstudio, then the differences in the cars it is very overwhelming. I word searched ...

So one of my two injector drivers has failed, need to know how to test to see what component might have failed on the board.

Original test, blue is injector driver for cylinders #2 (reading #2) & #4. Yellow is for #1 (reading #1) & #3, and clearly shows is bad.

http://i142.photobucket.com/albums ...

Lance, after re-reading your post, the first sentence is what I was looking for. My only concern now with this working is that making sure the o-scope traces are representative of a circuit that is switching between open and ground, since I think this is what the coil negative is going to need. I ...

Lance,

First off I really appreciate the reply. I had a 5v pullup when I was trying to drive a signal to the stock Toyota igniter (which is an ESA system on this 92 Paseo) which was very similar but not exacly the same as on the VAST system you linked.

But my understanding from reading step 65 ...

So after having some major trouble trying to use my stock Toyota igniter and a Bosch module to control my coil, I have decided to forget about the igniter/module and just use the MS direct coil control. So I was modifying my MS2 V3 board to install the jumpers per the megamanual, started bench ...