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

ENGINE 113.986

ENGINE 113.987

ENGINE 113.988

ENGINE 113.989

Fig 1: Engine Oil Information, Function (Engine 113)

Courtesy of MERCEDES-BENZ USA

Oil sensor signal assignment

Fig 2: Signal Assignment Of Oil Sensor

Courtesy of MERCEDES-BENZ USA

The tasks of the oil sensor are:

To measure the oil temperature
Detecting the oil quality for indication of need-based oil change interval
To warn the driver that the oil level is too low by an indication in the instrument cluster (A1)

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

The oil sensor operates in accordance with the capacitive measuring principle and features integrated electronics which convert the three signals into a PWM signal.

The PWM signal is sent to the ME control unit (N3/10) and then continues on via the CAN databus 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 quantization in each case is based on the on/off ratio (T) of approx. 20 to 80 %.

The voltage for the oil sensor (approx. 5 V, sensor voltage) is supplied by the ME control unit.

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

ME-SFI [ME] control unit component description	N3/10	GF07.61-P-6000SM
Oil sensor component description	B40	GF18.40-P-2000SM