Motronic MED 9.1
Sensors
Fuel Pressure Sensor G247
The Fuel Pressure Sensor is located on the lower fuel
distributor pipe. It measures the fuel pressure in the
high-pressure fuel system.
Signal Utilization
The ECM analyzes the signal and regulates the fuel
high pressure through the Fuel Pressure Regulator
Valve N276 in the high-pressure pump.
Effects of Signal Failure
If the Fuel Pressure Sensor fails, the fuel pressure
regulator valve is activated at a fixed value by the
ECM.
360_110
G247
Low Fuel Pressure Sensor G410
The Low Fuel Pressure Sensor is located on the high-
pressure fuel pump. It measures the fuel pressure in
the low-pressure fuel system.
Signal Utilization
The signal is used by the ECM to regulate the low
pressure fuel system. Based on the signal from the
sensor, a signal is sent by the ECM to the Fuel Pump
Control Module J538, which then regulatesTransfer
Fuel Pump G6 as needed.
Effects of Signal Failure
If the Low Fuel Pressure Sensor fails, the fuel
pressure is not regulated as needed. Fuel pressure is
maintained at a constant 72 psi (5 bar).
360_109
G410
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