Fuel pressure sensor

The sensor is one of the least unreliable and fuel system components without the need for it is better not to move. The sensor is powered by a 5V voltage depending on the pressure and the output voltage varies from 0.5 to 3.2 V. Voltage is 0.5 V in the absence of pressure, or a very low pressure (5 bar with pre-pump). With the increase in pressure increases and the voltage about 3.2 V, the critical pressure of 125bar engine. In normal operation conditions, it should not fall below 2.2 V and exceed the 3V depending on engine speed and load which corresponds to a pressure of 60-90bar. After warming up at idle is about 2.6 V. The method is very approximate, but allows for an initial diagnosis without a computer.

Disassembly of pressure sensor

The pressure sensor can be removed only on a cold engine. To be safe, also have a fire extinguisher nearby. An attempt to remove the hot engine can cause a fire. The fuel is under high pressure and temperature is about 100 ° C. Unsealing of such a system leads to the immediate point of gasoline and throw it out, which can cause ignition and explosion of fumes or burns.
Spanner [27], unscrew the sensor. In the absence of such a key, remove the regulator and remove the sensor wrench. Despite the large diameter screw valve key is quite low torque, it has a fine thread and is screwed into the aluminum rail. No need to loosen the sensor should not be as easy to break the thread of the rail.
Absolutely not attempt to loosen the sensor by holding the plastic seat, very easy to break or turn the housing, then the break is fine jointing tape.
The tightness of the system is essential for the proper operation and safety. Therefore, all the operations you perform at your own risk.
Construction of the sensor

Look inside the pressure sensor, piezoelectric sensor is located under the board electronics


Sensor connection

In the case of incorrect reference pressure (over 170 bar or below zero) it is necessary to check the correct connection of the sensor to the computer.

Pressure sensor F5R Team

