New Generation N62 Engine
Chapter 4 P.16
Course Contents/Background Material
© BMW AG,
Service Training
The different electrical material properties of the engine oil
(dielectric) change the capacitance of the capacitor (oil
condition sensor).
This capacitance value is processed to a digital signal in the
evaluation electronics (7) which is integrated in the sensor.
The digital sensor signal is sent to the DME in the form of a
statement about the engine oil condition. The DME processes
this sensor value to calculate the next oil change service.
The engine oil level is determined in the upper section of the
sensor (5). This part of the sensor is located on the top of the oil
level in the oil sump. As the oil level lowers (dielectric), the
capacitance of the capacitor also changes. The sensor
electronics process this capacitance value into a digital signal
which is sent to the DME.
A platinum temperature sensor (9) is integrated at the foot of the
oil condition sensor to measure the oil temperature.
The engine oil level, oil temperature and engine oil condition are
constantly recorded, provided voltage is supplied to terminal 15.
The oil condition sensor is supplied with voltage via terminal 87.
Possible malfunctions/consequences
The oil condition sensor electronics system has its own diagno-
stics function. A fault in the OEZS results in a corresponding
error message being transmitted to the DME.
