How turbo pressure sensor works?
The turbo pressure sensor is a sensor that provides a linear current from 0 to 5 volts according to the pressure that is exerted on its membrane. The sensors installed on vehicles are dimensioned (for cost savings by manufacturers) based on the maximum capabilities of the original turbo pressure. It can occur after a hard mapping (for example vehicles with larger turbo) that these sensors arrive at the maximum limit of pressure generating errors in the control unit. In these cases we proceed with the replacement of the sensor with one with higher capacity (for example, from 3 to 4 bar). This change necessarily requires the linearization of the sensor in the control unit, changing the sensor reference scale (volts / mbar) and allowing the controller to read the values correctly and avoid mistakes in the tachometer.
How to adapt the ecu to a different pressure sensor?
All reference tables of the sensors installed on the vehicle are written in the software of the control unit, so its replacement with others with different technical specifications requires the modification of the control unit, at the end the pressure readed by the diagnosis with the analog must be verified through a pressure gauge to make sure that the calculations are correct and that the unit works properly.