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Common Rail Pressure Sensors

Posted on 3/10/2016 10:31:54 AM

The common rail diesel engines in a vehicle are fitted using a fuel rail pressure sensor. The fuel rail pressure sensor indicates pressure existing in the fuel rail to the engine control unit. This rail possesses an under pressure supply of diesel fuel which is ready to be used by the injectors. The drop of pressure in the rail is immediately signaled by the sensor to the engine control unit. This is followed by the restoration of pressure in the pump. It is the engine control unit that controls the fuel supply of the rail from a pump possessing very high pressure. This is done by using a valve for controlling the pressure of fuel. It is very important to carry out a diagnostic check if in any circumstances the fuel pressure sensor becomes faulty or fails to carry out its job.

The Facts and the Function
A Fuel Rail Pressure Sensor reduces evaporative emissions coming through automobiles by providing the engine only a specific amount of fuel required to run in the proper manner. This way, there is no fuel left in the fuel line which can be used for evaporation. It is the internal pressure of the rail that is read by the fuel pressure feeler and this is how the sensor senses the exact amount of fuel present in the fuel rail. Next, there is an electronic message sent by the sensor to the Powertrain Control Module indicating the exact amount of fuel required to be provided into the engine.

The Appearance of a Fuel Rail Pressure Sensor
A fuel rail pressure sensor generally coils into the normal rail and it can even be removed very easily. However, it should be removed only when the engine is completely switched off. What you need to do is simply take out the electric male that connects the plug and then unscrew the whole thing using the usual method. The Fuel Rail Pressure Sensor does not switch off and on meaning it is in no ways solenoid. The sensor senses the fuel pressure in the normal rail and works in a very simple manner. The other important sensors that you can locate on the vehicle engine include:
•    Cam position sensor
•    Crank position sensor
•    Temperature sensor
•    Air flow sensor or meter
•    Boost pressure sensor

Is it possible for the fuel rail pressure sensor to go wrong?
Yes, it is quite possible for the fuel rail pressure sensor to go wrong. The sensor serves as a very weak point in loop systems and the different types of sensors are all prone to damage and failure. If you find the sensor running faulty then it is not necessary for you to change the rail. It is just the sensor that you need to change and not the rail.

Symptoms of a Faulty Fuel Rail Pressure Sensor
The main symptoms of a faulty fuel rail pressure sensor include difficulty to start your car, cutting out and very rough and erratic running. You will also receive an error code if your sensor goes faulty. The error code will appear when you carry out a scan of the engine. Replacement of the fuel rail pressure sensor is quite easy and you do not require any kind of engine recoding for this purpose. The fault codes need to be cancelled from the engine control unit memory.

Different brands of Fuel Rail Pressure Sensors
The most important brands of fuel rail pressure sensors are Siemens/Delphi, Bosch and Denso (Japanese). You’re free to use the brand you want. The Bosch sensors easily fit in Hyundai and Kia while the Denso sensors fit into Toyota, Nissan and Mazda. When dealing with such sensors it is quite necessary for you to have the right expertise and knowledge otherwise you can end up carrying out wrong procedures.

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