Engine oil information, function - GF07.61-P-3026M

ENGINE 275.950 in MODEL 215, 220

ENGINE 275.951 in MODEL 230 up to Model Year 8

ENGINE 275.953 in MODEL 216, 221 up to Model Year 8

ENGINE 275.954 in MODEL 230 up to Model Year 8

ENGINE 275.980 in MODEL 215, 220

ENGINE 275.981 in MODEL 230 up to Model Year 8

ENGINE 275.982 in MODEL 216, 221 up to Model Year 8

ENGINE 285.950 in MODEL 240

ENGINE 285.980 in MODEL 240

Fig 1: Engine Oil Information Function Diagram

Courtesy of MERCEDES-BENZ USA

Oil sensor signal assignment

Fig 2: Identifying Oil Sensor Signal Assignment

Courtesy of MERCEDES-BENZ USA

Tasks of the oil sensor are:

Detecting oil temperature
Detecting oil quality for demand-based oil change interval display
Warning the driver that the oil level is too low by means of an indication in the instrument cluster

The oil level, oil temperature and oil quality are detected by means of an oil sensor installed in the oil pan.

The oil sensor, which functions according to the capacitive measuring principle, has integrated electronics, which process the three signals into one PWM signal (pulse-width modulate signal). The PWM signal is transmitted to the ME-SFI [ME] control unit and then on via the CAN data bus to the instrument cluster.

Each information block consists of three successive square-wave signals, This is followed by a short pause.

A measured variable is assigned to each square-wave signal (A, B, C). The quantisizing in each case is based on the on/off ratio (T) of approx. 20 to 80 %.

Power for the oil sensor of approx. 5 V (sensor voltage) is supplied by the ME-SFI [ME] control unit.

Faults at the oil sensor are detected by the ME-SFI [ME] control unit and entered in the fault memory.

ME-SFI [ME] control unit, location/task/ design/function	GF07.61-P-5000M
Oil sensor, location/task/design/function	GF18.40-P-4111MB