Correct power to the coils is almost as important as the rest of the signal connections - almost ...
I re-read some of what I wrote and the more I think on it - I'm not home and don't have schematic in front of me
- I need to clarify a couple things.
* The 5vdc ('C' terminal) signal to the coil(s) does come from the ECM via individual pin-outs as has been discussed, the crank sensor triggers the outputs to these via ECM, but not directly as it reads in my reply ... It's just as important to the system, just not directly connected ...
* The 'ground' ('B' terminal) goes directly back to the ECM also. This is actually some sort of 'low' reference signal to the ECM, but functions same as a common ground for either bank of coils.
* IIRC I once traced the Pink power feed wires ('D' terminal at coil connector) from both banks back to the underwood fuse block with feed source of the same two (2) 20A circuits (INJ-A/ING-B) that we're feeding the Injectors.
Kinda makes some sense they would use the same feed for both systems since you need them in tandem to run the engine ...
Hope some of this helps and I'm not
you even more.
I swear I feel I don't understand half of the wiring under a hood anymore - but I can fix and start just about all of them if I try hard enough
When I get home I'll peruse my LS info to see if can make any of this any more clear-as-mud
Good thing I'm so far away you can throw anything at me