What is Pressure Sensor?

 Diesel vehicles need to mix high pressure diesel fuel with high pressure air in order to burn their fuel. The diesel fuel coming from the fuel pump is increased up to 2500 bar pressure thanks to the high pressure pump and sent to the injectors.

The fuel pressure of each vehicle is specially adjusted. For this adjustment mechanism to work, the pressure of the fuel going to the injectors with the pressure pump must always be measured. The pressure sensor is located just after the fuel pump, in the fuel pipe or in front of the injectors. When pressurized liquid passes over it, it sends a volt value in the range of 0-5 volts to the electronic management center of the vehicle, called ECU. The center processes the incoming information and ensures that the fuel reaches the cylinders if it is at the right pressure for combustion. Pressure sensors play a very important role in the healthy operation of engines. If the information from the sensor is not correctly identified, the ECU may start the engine at idle speed or turn it off completely. For this reason, when the pressure sensor fails, your vehicle either does not start or does not exceed a certain speed. The sensor is connected to the ECU with 3 wires, one for signal, the other for volt and finally ground. In general, the error code is 0191 in vehicles and is seen as an engine error on the instrument panel. To make sure the sensor is malfunctioning, the engine is started and the voltage in its wires is measured with a volt meter. The vehicle is throttled and the resulting volt fluctuations are examined. If there is a sensor malfunction, the volt meter values will not change and the sensor should be replaced. In most brands of vehicles, this sensor can be easily removed with a key. The cables also have a socket structure and can be changed very quickly. In case of malfunction, this part should be checked from time to time, since it is possible to leave it on the road.