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i have recently rebuild an LS3 and put it in my can, it won't start. the fuel pressure it there, i got aftermarket LS wire harness, everything is connected correctly, the brake line connected to give +12v when brake is pushed, clutch line connected to ground, vats is dissabbled
the ECM i have is E38, i can connect my diagnosis tools to it. the diagnostic tool that i am using are is PCMSCAN using elm327 and the only thing is that i get is can sensor neads to learn.
You need to start with basic diagnostics, Does it have spark at the end of the spark plug wire? Are you getting fuel out of the injectors? Pull a spark plug and see if it is wet from fuel? If it's drive by wire is the throttle body opening when you press the pedal?
that is first thing i checked the fuses and the ground, but i noticed that the injectors are not triggering, i scanned it here is a list of the errors. my harness that i got is from HPI, the VSS and reverse lock are not connected. also, my clutch wire is to to be +12v or ground when in the pedal is pressed?
i finally got the engine run for only a few seconds yesterday, i was jumping for joy. this is how i got it to work, the wire harness that i got is for LS swap by HPI, the clutch wire that is labelled is an option, but in fact that is the park neutral switch on X1 connector to the E38 ECU, and based on that i used HP tuners to hardware and software to disable Starter motor check and clutch position sensor. Once i did that my injectors are working (checked it with noid) lights and the rest is history.
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And are solid.. Also make sure the non harness grounds are all tight and clean. 
LS3 swap 
