Kia Picanto: Engine Control System / Rail Pressure Sensor (RPS)

Kia Picanto JA 2017-2022 Service & Repair Manual / Engine Control / Fuel System / Engine Control System / Rail Pressure Sensor (RPS)

Specifications
Specification
Item
Specification
Rated Voltage (V)
5
Operating Voltage (V)
4.75 - 5.25
Connector
3

Pressure
Output Voltage (V) [Vref=5V]
bar
[MPa (kgf/cm², psi)]
0
0 (0, 0)
0.5
175
14 (142, 2031)
2.5
350
28 (286, 4061)
4.5

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 into a voltage signal, which is used by the ECM to precisely control the injection amount and time. Also, if the actual pressure calculated from the sensor output signal differs from the target rail pressure, it controls the rail pressure by using the rail pressure control valve.

Schematic diagrams
Circuit Diagram
[A/T]

[M/T]

Repair procedures
Inspection
1.
Connect the KDS on the Data Link Connector (DLC).
2.
Measure the output voltage of the RPS at idle and various engine speed.
Pressure
Output Voltage (V) [Vref=5V]
bar
[MPa (kgf/cm², psi)]
0
0 (0, 0)
0.5
175
14 (142, 2031)
2.5
350
28 (286, 4061)
4.5

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 (-) terminal.
3.
Remove the intake manifold.
(Refer to Engine Mechanical System - “Intake Manifold")
4.
Remove the delivery pipe & injector assembly.
(Refer to Fuel Delivery System - “Delivery Pipe")
5.
Disconnect the rail pressure sensor connector (A), and then remove the sensor (B) from the delivery pipe.
Rail Pressure Sensor:
30.0 - 35.0 N·m (3.1 - 4.1 kgf·m, 22.1 - 29.5 lb·ft)

Installation
   
Install the component to the specified torques.
Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
1.
Install in the reverse order of removal.
Troubleshooting
Signal Waveform

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