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

ENGINE 113.990 in MODEL 211, 219

ENGINE 113.991 in MODEL 215, 220

ENGINE 113.992 in MODEL 230 up to Model Year 2008

ENGINE 113.993 in MODEL 463 up to 31.5.12

ENGINE 113.995 in MODEL 230 up to Model Year 2008

Fig 1: Identifying 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

The 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 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 control unit.

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

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