Hyundai Elantra: Engine Control System / Rail Pressure Sensor (RPS)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Rail Pressure Sensor (RPS)

Description and operation

Description

Installed on the delivery pipe, the Rail Pressure Sensor (RPS) 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 adjust the fuel pressure with the fuel pressure regulator valve if the target pressure is different from the actual pressure calculated by the RPS output signal.

Specifications

Specification

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Connect the diagnostic tool on the Data Link Connector (DLC).

Measure the output voltage of the RPS at idle and various engine speed.

Condition	Output Voltage (V)
Idle	Approx. 1.2
1,500 rpm	2.0 - 2.2
6,300 rpm	Approx. 2.8

Removal

1.	Release the residual pressure in fuel line. (Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

2.	Turn the ignition switch OFF and disconnect the battery negative (-) cable.

3.	Remove the intake manifold. (Refer to Engine Mechanical System - "Intake and Exhaust System")

Disconnect the rail pressure sensor connector and then remove the sensor (A) from the delivery pipe.

Tightening torque :

29.4 - 34.3 N.m (3.0 - 3.5 kgf.m, 10.8 - 15.9 lb-ft)

Installation

•	Install the component to the specified torques.

•	Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

•	Apply the sealant to the sensor.

•	Insert the sensor in the installation hole and be careful not to damage it during installation.

1.	Install in the reverse order of removal.

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Steering wheel audio control

The steering wheel audio control switches are installed for your convenience.

NOTICE

Do not operate audio remote control buttons simultaneously.

VOLUME (VOL + / VOL -) (1)

Move the VOLUME toggle switch up to increase volume. Move the VOLUME toggle switch down to decrease volume.