Oil pressure sensor：The engine oil pressure sensor is used to detect the engine oil pressure, usually screwed into the oil passage of the cylinder block by screws. Its working principle is that there is a variable resistor inside the oil pressure sensor, one end of which outputs a signal, and the other end is connected to a grounded sliding arm. When the oil pressure rises, the oil pressure pushes the diaphragm to bend through the lubricating oil channel interface, and the diaphragm pushes the slider to move to the low resistance position, which increases the output current in the circuit; on the contrary, the diaphragm pushes the slider to move to the high resistance position, Reduce the output current in the circuit, and then use the pointer on the oil pressure gauge to indicate the oil pressure.

EngineOil pressure sensorThe switch is usually installed on the main oil circuit of the engine body to detect the engine oil pressure value. When it is lower than a certain specified value, the oil pressure warning light is lit. When there is no oil pressure or low pressure, the spring pushes the diaphragm and the cONtact is (on) closed; when the specified pressure is reached, the diaphragm overcomes the spring force and closes the contact.

The indicator light of the oil pressure sensor is installed in the combined instrument, and the pressure switch is installed in the engine lubricating oil circuit. In the pressure switch, there is a diaphragm acted on by oil pressure and a contact acted on by oil pressure. When the oil pressure is lower than the specified value, the diaphragm has no force to push the spring, the contact is closed, and the indicator light is on; when the oil pressure is higher than the specified value, the diaphragm pushes the spring up, the contact separates, and the indicator light goes out to inform the driver The oil pressure has reached the specified value. Under normal circumstances, the contact action pressure in the range of 30~50 kPa.

The detection method of the switch of the oil pressure sensor is as follows:

After the ignition switch is turned on, the oil pressure indicator does not light up. The cause of the fault is that the oil pressure indicator wire harness falls off, or the filament is blown, or the fuse is blown. After the engine is started, the oil pressure reaches the specified value and the oil pressure indicator lights up. The cause of the fault is that the contact switch is not working properly or the wiring harness is grounded.

What happens if the oil pressure sensor is damaged:

The oil pressure signal shows that the engine oil pressure is lower than the specified value. The engine control module considers this to be a fault and stores it as a fault code 415. At this time, due to the low oil pressure, the protection function of the engine takes effect, forcing the engine power and speed to drop, which may cause the engine to stall for protection. The oil pressure sensor is installed on the cylinder block.

After starting, the oil pressure indicator light is always on. The engine trouble light stays on. Idle speed, oil pressure value is 0.99. Fault code: P01CA (oil pressure sensor voltage is higher than the upper limit)

Cause analysis: The oil pressure sensor probe is seriously damaged, the ECU detects that the oil pressure sensor is not connected, and the instrument display value is the internal substitute value of the ECU.

Solution: CheckOil pressure sensor. If the short circuit display is normal, it means that your sensor is normally open switch output. The switch has only two states. If there is oil in the chassis, but the sensor still does not output, it means that the sensor is damaged. If it is a two-wire system, string into a small light bulb (5-24v) to see if the light bulb can be lit, if not lit (with oil) must be broken.

Jiangmen Hengmin Intelligent Control Instrument Co., Ltd. is a pressure transmitter manufacturer, mainly engaged in oil pressure sensors, wall-mounted boiler water pressure sensors, urea pump pressure sensors, hydrogen pressure sensors, pressure calibrators, automobile pressure sensors, water pump pressure sensors, water pressure Sensors, intelligent pressure controllers, high pressure sensors and other products. Our company found in the research industry production activities that with the increasing popularity of the Internet of Things and intelligent manufacturing concepts, the demand for pressure sensors in my country has grown rapidly in recent years. In response to the needs of the era of intelligent manufacturing, our company has developed high-precision testing instruments and special production system equipment for pressure sensor manufacturers to help sensor manufacturers greatly reduce the labor intensity of testing, reduce the number of workers, improve product quality, improve production efficiency and reduce production costs.