Hyundai Ioniq (AE): Rail Pressure Sensor (RPS) / Description and operation
Rail Pressure Sensor (RPS) is installed on the delivery pipe and measures the instantaneous fuel pressure in the delivery pipe. The sensing element (Semiconductor element) built in the sensor converts the pressure to voltage signal. By using this signal, the ECM can control correct injection amount and timing and adjusts the fuel pressure with the fuel pressure regulator valve if the target pressure and the actual pressure calculated by the RPS output signal are different.

Other information:
Inspection1.Check that the voltage values of No. 1, 2 duct sensors change1. Sensor (+ 5V)2. Sensor groundSpecification Ambient temperature [°C (°F)] Resistance (kΩ) Voltage (V) 50 (122)1.
Service Point Target Auto Calibration (SPTAC)When you need calibration :–
Front view camera is removed and mounted–
Replace front view camera with a new one –
Windshield glass changed–
Front view camera coupler of the windshield glass is deformedService Point T