The sensor is installed in the inlet line leading to the two high-pressure fuel pumps. It measures the fuel pressure of the low-pressure fuel system and sends a signal to the engine control unit.
Signal application
The engine control unit uses this signal to control the low-pressure fuel system. The engine control unit sends a signal to the fuel pump control unit according to the sensor signal for it to adjust the electronic fuel pump as needed based on this signal.
Effects of signal failure
If the fuel pressure sensor fails, the fuel pressure adjustment will be replaced by the fuel pressure preset. The fuel pressure is about 6.5 bar.
2. High-pressure fuel pressure sensorThis sensor is located in the V-groove of the cylinder block and is connected to the fuel distributor by a pipe.
It measures the fuel pressure of the high-pressure fuel system and sends a signal to the engine control unit.
Signal application
The engine control unit analyzes this signal and regulates the pressure in the fuel distributor line through two fuel metering valves.
Effects of signal failure
If the fuel pressure sensor fails, high fuel pressure cannot be established. The engine runs urgently with low fuel pressure. Cause power and torque losses.
3. Boost pressure sensor with intake air temperature sensorThis combined sensor is screwed into the charge air pipe immediately in front of the throttle control unit. The sensor measures the pressure and temperature in this area.
Signal usage
The engine control unit adjusts the boost pressure of the turbocharger through the boost pressure limit solenoid valve according to the boost pressure sensor signal.
The correction value of the boost pressure is calculated from the intake temperature sensor signal. Here, the influence of temperature on the charge air density is considered.
Impact when signal is missing
When the sensor fails, the turbocharger can only be operated under controlled conditions. When more sensors fail, it may also cause the compressor to shut down.
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