mechanical problem.

hello friends. I have a problem with a Peugeot 205 year 97 1.6cc with monopunto injection.
It happens that it has starting problems (engine does not part) within all the checks that were made it was determined that the computer was bad. It was sent to repair but the problem persists. The injector reaches food tension and the coil as well, but at the time of starting there is no injection and less spark.
Everything indicates that the engine regime sensor is bad but the resistance value is within tolerance and the continuity of the cables is fine. The alternate voltage signal that the sensor delivers and is with a multitester is also shown is constant and the catalog value tells me that it must be fluctuating. With all this information I hope someone can help me solve the problem.
I will appreciate it.

Hello, first first of all, it controls all the engine ground cables and especially those that are connected to the switchboard, then every rotation sensor is of quadra wave and what you can read with a tests is very little you need an oscilloscope or a diagnostic device, it seems strange to me that does not arrive or gasoline that car does not suffer any accident? or control the inertial switch that you should the engine's vain, do these tests and let me know greetings Alf.-