5 XF 95 series Description of components COMPONENTS Inspection The engine oil level sensor can be checked with a multimeter set to the resistance range. The resistance value is between 20.5 and 23.5 ohms, measured at 20 C. The maximum current strength of 200 mA should not be exceeded when the resistance value is measured. 2.5 PRESSURE SENSORS 2 The vehicle has a number of pressure sensors, such as: - Pressure sensor for recording the bellows pressure in ECAS. - Pressure sensor on the air supply unit. There is a diaphragm made of semiconducting material (silicon) in the pressure sensor. When pressure is applied to the diaphragm, it will be deflected.
Deflection of the diaphragm leads to a change in the resistance of the semiconducting material. The diaphragm is part of what is known as a bridge circuit. Deflection of the diaphragm unbalances the bridge circuit, which changes the output signal. The output voltage is in direct proportion to the pressure applied (deflection of the diaphragm). V Inspection The output voltage can be checked using a multimeter set to the DC voltage range. W 5 01 012 200303 2-7