I'm trying to find out if the immobilizer in the 00 gsr is in the ecu (ie signal is sent to ecu and w/out ecu won't allow car to start) or if it's external (somewhere else in ignition....seperate from ecu). I'm trying to figure out why my swap won't start.....I've checked damn near everything else.

 

the immobilizer usually is in the ecu

 

The signal to the fuel pump is at a different place than the cars with no imobilizers. You need to move the fuel pump wire for your swap to work properly.