2000 Oldsmobile Bravada. It was purchased with the ignition key missing. The car had the ignition cylinder drilled with all but 3/4" of the ignition cylinder remaining. The battery was replaced. The fuel pump replaced. It started & ran. The fuel tank wasn't mounted right. New fuel pump was not locked onto gas tank. When gas tank and fuel pump improperly installed engine will not start. Assume that I am passlock 2 was keeping the engine from starting. Replaced the drilled out lock cylinder. Engine still did not start. Try to teach the ECU and register the new lock cylinder. No joy! Check pressure to fuel rail but not with pressure gauge. Observed the cycling of the fuel pump and pressure at the fuel rail test point. Thinking that either passlock 2 not being registered fully would keep from engine some running! I noticed the three wires to the hall effect on the ignition housing. There is also two wires to what seems to be a switch going to the ignition cylinder housing with a small plastic housing. This switch would not clip into place the button on this assembly was stuck. I don't know the correct way this switch / sensor Clips or mounts to the lock cylinder housing. What are start interlocks are on a 2000 Oldsmobile and how would anyone of them keep the engine from staying running? I don't have the schematic diagrams and would appreciate some help!