LOL - I built an on-bench emulator, so I can test further in the comfort of my LAB Chair!!!
It turns out that the injector for cylinder #6 correlates to Power MOSFET "Q1", the GATE of which is driven by U15 (16079435). This section is in working order.
Injectors for cylinders, 1,2,3,4,5,7 and 8 are correlated to Power MOSFETS "Q2 thru Q8", the GATEs of which are driven by U13 (23232). This section is NOT in working order.
I suspect, I could readily drive all the transistors with the 5v+ feed provided to Q1 from U15 but this would be a crude workaround because all injectors would fire concurrently (non-sequential-injection).
My preferred approach is to install a general purpose micro-controller inside the ECM and customize firmware to overcome the on-board deficiency and to maintain Sequential Injection capability.
Sidebar: If anyone has a defective, defunct or otherwise useless LT5-ECM, please drop me an email. I suspect I will need some test mules to further this project.
Found a photo here:
https://www.facebook.com/photo.php?f...type=3&theater