Doing a transplant using a donor 2006 GTO LS2 engine/t56/E40/harness all from the same vehicle. I wired the C1 connector (Blue) for the vehicle connection. First attempt at Crank got no cranking and a P1629 vehicle theft DTC. I then had the ECU flashed locally using EFILive to remove the VATS. Same "no crank" situation but no P1629 this time.

I think I have the C1/Blue connector wired correctly but how would I know?

Does anyone have the minimum set of wires required for an E40 ECU to start?

For an LS2/T56, is there a TCM? Does that generate the ParkNeutral signal?

Is it the Crank purple wire that tells the ECU to ground the "clutch pushed" circuit?

What other signals does the ECU look at in order to Crank?

Thanks!