The detection method of the oil pressure sensor: the pressure of the oil pressure sensor is linear with the output voltage, the pressure is from 0 to 10 bar, and the output voltage is from 0.5 to 4.5 volts. To determine the fault method: first turn the ignition switch to OFF, unplug the oil pressure sensor harness, then turn the ignition switch to ON, and determine whether the voltage between the 3 pin A24 of the plug and the ground is the input voltage or the input voltage, 4 pin Is the voltage between the ground and the ground zero?
Pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors, both of which are micromechanical electronic sensors generated on silicon wafers.
Silicon piezoresistive pressure sensor adopts high-precision semiconductor resistors and strain gauges to form a Wheatstone bridge as a force-electricity conversion measurement circuit. It has higher measurement accuracy, lower power consumption and extremely low cost. If there is no pressure change, the output of the piezoresistive sensor of the Wheatstone bridge is zero, and almost no power is consumed.
The MEMS silicon piezoresistive pressure sensor adopts the inner wall of a circular stress cup silicon film fixed on the periphery, and uses MEMS technology to directly engrave four high-precision semiconductor strain gauges on its surface stress, forming a Wheatstone measuring bridge as a power Transform the measurement circuit to directly convert the physical quantity of pressure into electric quantity, and its measurement accuracy can reach 0.01-0.03%FS.
Capacitive pressure sensors use MEMS technology to create a diaphragm grid on the silicon wafer. The upper and lower diaphragms become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure and changes the upper and lower diaphragms. The spacing of the grids changes the capacitance between the plates, that is, △pressure=△capacitance.
Oil pressure sensor position
According to Repair Pal, the oil pressure sensor is usually located between the oil filter and the oil pan near the bottom on the right side of the engine. However, oil pressure sensors, also known as oil pressure switches or sensors, have different positions depending on the vehicle.
According to Autos, the oil pressure sensor measures the pressure of the engine oil pumped by the oil pump. Oil pumps in good working condition operate from 20 to 40 pounds per square inch. If the pressure falls below this range, severe and permanent engine damage will occur. Some vehicle dashboards have built-in electric and mechanical oil pressure gauges, while others have signal lights. The vehicle oil pressure warning system reminds the driver of the problem detected by the sensor.
According to AutoZone, the reason for the low oil pressure reading is usually the failure of the oil pressure sensor. If the oil pressure in the main oil passage is not low, but the oil pressure sensor reading is low, the sensor is likely to be faulty and needs to be replaced. The mechanic can check if the sensor connection is loose or broken. If the engine oil is insufficient, the mechanic can look for signs of oil leakage.