Not a spark

Good morning, I have a Nissan Sentra 4 cyl, what he has is that the prinsy is not Avia spark in a spark plug (#4) and he came the bovine thinking that it was, and it did not remain the same, then the bad bovine came to him for the no.1 And if the spark plug was good but now it is worse because he does not have a spark in number "2" 3 " Checked nothing except for the bovines that Camvie. Someone who has experience in these imported cars, thank you ,,,,

The car is year 2000

It just does not have a spark or also has no signal to the injectors did you scannea ???

Thank you for answering, notice that if there a sign in the injectors, the 4 ,, and Tamvien how the battery could no longer scan it, at first glance what can it be? It is that even though it goes out of time spark has to see, but I don't know in this car, what do you think about this? New mind.

In these cars there is a very common problem, and it is that the driver is damaged that controls the coils if there is an availability to buy another Ecu Aslo because as a rule in almost all vehicles if there is no spark Replace someone with knowledge and experience in repairing Ecus because work is very delicate and you have to know how to connect, identify the entrances and outputs of the IC and only 4 of the 6 inputs and outputs of the IC are used, the feeding is the same 5V but being the simplest IC that the original is giving coil failures because it does not have diagnosis to indicate to the ECU that the coils are connected.