Gases Ford Fiesta Newport 1.3 Cat of 1994

Hello,
this is my last resort before sending the car to the scrap. I have recently passed the ITV, up to 4 times, and they throw me by accelerated idle gases (it must be 0'30 and I do 0'47). I have changed catalyst, Lambda and MAP sensor. All sensors give a good voltage signal in checks. I have seen that 5V enters the MAP sensor in the connection clema through the signal cable from the ECU. This makes the MAP sensor fixed in 2'60 volts and I think it is the problem (the map is new). My question is ... how can you receive voltage from the ECU when it is supposed to be the ECU who should receive for that signal cable. The oil pressure sensor does not give a signal and I do not know if for that reason the ECU is put in that mode or I no longer know what I do not look for. Aid please