Negative Pulse Problem in ESTEM injectors

Good evening my case is the following I have a Chevrolett Est this year 2001 year, all the following pears were changed: straps, tensioner, coils, cam and crankshaft sensors, admission and escape valves, gasoline filter, apart from that, in that was done injectors and all were ok, but the problem persists when Injector 1 and 4 The injectors 2 and 3 arrives negative, I do not know what to do because the computer does not turn on the light of check Engine I download the workshop manual and put the cam and the crankshaft ready but nothing the two injectors still do not receive current

Check the computer or test with another and you will see that your problem is solved

Here in Maracay you get but look for another car and try it with another car and you will see

Hello friend, before exchanging the ECU isgurate that none of the cars have immobilizer, since if so you will not have a car with problems but 2.
I do not know that model, surely it is American, and surely it has an injection of the Multec, and ignition without a distributor, (that is multiple coils) if it is so notice if the coils of the cylinders that you have a negative pulse.
If you do not arrive, you have problems in the ECU.
To rule out, I would remove the ECU and from the pinera I would measure if the missing injection pulse comes (with the connected injectors) and control the continuity of the cable, it can be cut or with a loose connection.

I even disarmed the computer and there is no integrated or anything burned or cold oscare