Group 23 EMS 2 Design and function
17
Oil level sensor / oil temperature
sensor (12)
The sensor is located in the oil sump.
The purpose of the level sensor is to detect if the oil
level becomes too low. A current is passed through
the sensor and the voltage measured across it is then
proportional to the oil level. A alarm signal is sent
when the oil level is too low. The temperature sensor
consists of a non-linear resistor, where the resistance
is dependent on the temperature of the resistor body.
The resistance drops as temperature rises.
Crankcase pressure sensor (13)
The sensor is located on top of the engine in the mid-
dle of the valve cover on the engine’s left side.
The pressure signal is a voltage signal proportional to
the pressure. The sensor reference voltage is 5 Volts.
Piston cooling pressure sensor (17)
The monitor is installed on the engine block below the
turbo on the right side of the engine.
The pressure signal is a voltage signal proportional to
the pressure. The sensor reference voltage is 5 Volts.
Air filter pressure sensor / air filter
temperature sensor (4)
Air filter pressure and air filter temperature are mea-
sured by a combined sensor placed above the air fil-
ter.
The air filter pressure sensor measures absolute pres-
sure, the sum of air filter pressure and atmospheric
pressure. The sensor consists of a monitor that sends
a signal to the control module when the pressure in
the air filter becomes too high.
The air filter temperature sensor consists of a non-lin-
ear resistor, where the resistance is dependant on the
temperature of the resistor body. The resistance drops
as temperature rises.

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