Hi all. I have an 01 Which is cranking but not starting. Secury light flashes when key is inserted. Does not flash when cranking. I replace the fuel pump not sure if it need to be replace. No spark at the plug. What could it be?

 

"Does not flash when cranking" - ok, but is the light ON or OFF? If ON, you have a NATS problem. If OFF, you problem is somewhere else. I would start by checking the fuses, and the ENG CONT1 fuse in particular. It's located in the engine compartment, in the fuse box next to the battery.