Imobilizer question for my a4 to s4 swap *NO START*

[s4quattro187]

So those of you that have seen my post about my s4 swap into an a4. I finally got to the point where im tryin to start it but now all of the sudden the fuel pump isn't kickin on. I know it was working before because I accidently turned the key while the fuel lines were not connected. My question is now that I swap'd a new ecu/engine do I need to swap the s4 ignition because one or the other might have a imobilizer? I thought it was only in B6+ but I dont understand why the fuel pump is not working all of the sudden. I swap'd the s4 cluster in and no luck. Anyone have any imput?

[DAP]

There is no immobilizer on US-spec B5s (A4 or S4). Start probing with a multimeter to see where your issue is.

[Daft]

Yeah, no immobilizer on the B5 cars.

Since this is an A4, you should check fuses 7, 31 and 32 to make sure they aren't blown.

[s4quattro187]

So let me ask you guys this, IF my vag is getting a missing signal from ecu code and the CEL light dose NOT come on with the key on, sounds like a case of a bad ECU correct?

[biketsai]

I had this same problem.
You should first check to see if your spark plugs are getting fuel.
You might have a bad fuse somewhere in the system that is messing things up.

[s4quattro187]

check all my fuses. fuel pump isnt kicking on, has power to the relay but no signal from whatever triggers the relay...assuming ecu....the no CEL light kinda eliminates just a fuse.