(3) Pressure Sensor a. The rail pressure sensor (Pc sensor) is attached to the rail in order to detect the fuel pressure. b. It is a semiconductor type pressure sensor that utilizes the characteristics of silicon, whereby the electrical resistance changes when pressure is applied to it. 4.2 V V C V OUT GND 1.0 V 0 200 MPa (2038 kg/cm 2 ) Q000258E Q000272E REFERENCE: It is necessary to reset the ECU default value using the Hino diagnosis tool at the time of supply pump service replacement. In addition, the ECU has a function enabling it to learn the performance of the supply pump at the time of ECU service replacement, so ensure sufficient time (several minutes) is available. 17