Hyundai Elantra (CN7): Engine Control System / Rail Pressure Sensor (RPS)
Description and operation
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
Schematic diagrams
Harness Connector
Repair procedures
| 1. | Connect the diagnostic tool on the Data Link Connector (DLC). |
| 2. | 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
|
|
| 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") |
| 4. | 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) |
|
| •
| 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. |
Description and operation
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Description and operation
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Other information:
Trouble Symptom ChartsTrouble Symptom 1Trouble Symptom 2
Trouble symptom
Probable cause
Remedy
The set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed se
Description and operation
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