Rail Pressure Sensor (RPS)

Description and Operation

Description

The Rail Pressure Sensor (RPS), installed on the fuel rail, measures the instantaneous fuel pressure in the delivery pipe. The sensing element (semiconductor element) built into the sensor converts the pressure into a voltage signal. Using this signal, the ECM controls the correct injection volume and timing, and adjusts fuel pressure with the fuel pressure regulator valve if the target pressure differs from the actual pressure calculated from the RPS output signal.

Specifications

Specification

▷ Type: Piezoelectric type

Pressure		Output Voltage (V) [Vref=5V]
bar	[MPa (kgf/cm², psi)]
0	0 (0, 0)	0,5
140	14 (142, 2031)	2,5
280	28 (286, 4061)	4,5

Troubleshooting

Signal Waveform

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

1. 1
   Connect the diagnostic tool to the Data Link Connector (DLC).
2. 2
   Measure the RPS output voltage at idle and at various engine speeds.

   Pressure		Output Voltage (V) [Vref=5V]
   bar	[MPa (kgf/cm², psi)]
   0	0 (0, 0)	0,5
   140	14 (142, 2031)	2,5
   280	28 (286, 4061)	4,5

Removal

1. 1
   Release the residual fuel pressure in the fuel line. (Refer to Fuel System - "Release Residual Fuel Pressure in Line")
2. 2
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
3. 3
   Remove the intake manifold. (Refer to Engine Mechanical System - "Intake Manifold")
4. 4
   Disconnect the rail pressure sensor connector (A), then remove the sensor (B) from the fuel rail.

   Rail pressure sensor: 29.4–34 N·m

   

Installation

Install the component to the specified torque. Note that internal damage may occur if the component is dropped. If the component has been dropped, inspect it before installation.

1. Install in the reverse order of removal.