Purpose
The oil condition sensor is designed to monitor the temperature, level and degree of contamination of the oil.
If the oil level drops too low, a signal is transmitted to the instrument cluster to inform the driver.
Functioning
The total signal of the sensor is a repeating triple of width-modulated rectangular pulses A, B and C with a height of 5 volts. The duration of each pulse expresses the state of the controlled parameter. The duration of the period T allocated to each pulse is a constant value. The percentage ratio of the pulse duration and the period duration T is the information code of the signal (drawing VN 9.030).
Accommodation
VN 9.028 1. Combined oil level, temperature and condition sensor B 40; 2. Screw
Design
VN 9.029 Oil condition sensor. Design:; 1. Oil temperature sensor; 2. Oil condition sensor BW; h. The oil level measuring range is 80mm (±40mm), the measurement error is ±3mm; Min. Lower limit of oil level measuring range; Max. Upper Limit of Oil Level Measuring Range
VN 9.030 Oil Condition Sensor Signals; 1. The ratio of the pulse duration to the period duration T is in the range from 20% to 80%:; A. The oil temperature is within normal limits; B. The oil level is within normal limits; C. The degree of oil contamination is within normal limits; 2. The ratio of the pulse duration to the period duration T is more than 80%:; A. Oil temperature is above +160°C; B. The oil level is more than 80 mm above normal; C. The degree of contamination of the oil corresponds to quality oil; 3. The ratio of the pulse duration to the period duration T is less than 20%:; A. Oil temperature below - 40°C; B. Oil level is below the minimum mark; C. The degree of oil contamination is high
The sensor information is transmitted to the engine control unit N3/9, where it is converted into a format suitable for transmission over the CAN multiplex network.
Faults that occur in the sensor are detected by the engine control unit N3/9 and recorded in the fault memory.
Tightening torques for threaded connections
Screw for fastening the oil level sensor to the oil pan - 14 Nm.
Stabilizer bracket mounting screw or nut - 30 Nm.
[Publication reprinted from this resource: mercedesman]