How does an oil pressure switch work

1. Low pressure switch F22

The low pressure switch F22 is installed at the rear end of the main oil passage on the cylinder head. The insulator is brown and marked with "(0. 3±0. 15) bar". The words (1bar=100kPa) are used to feel the oil in the cylinder head oil passage pressure.

F22 is a normally closed switch. When the oil pressure is higher than (30±15) kPa, the switch is divided.The low pressure switch uses the shell to directly ground to send a low oil pressure signal to J14., the oil pressure indicator light will flash during engine operation if the contact of the low-pressure oil pressure switch is connected.Therefore, this kind of alarm is a closed circuit light alarm.

2. High pressure switch F1

The high pressure switch F1 is installed on the base of the oil filter to feel the oil pressure of the main oil passage of the cylinder ., its insulation is white, and marked with "(1.8±0.2) bar", and the wiring color is blue/black.

F1 is a normally open pressure switch. When the oil pressure is higher than (180±20) kPa, the switch is closed, and the high-pressure switch is also grounded to the housing to send a high oil pressure signal to J114.During engine operation, the oil pressure indicator flashes and the oil pressure buzzer also sounds if the contact in the high-pressure oil pressure switch is disconnected,Therefore, such high pressure alarms are open circuit alarms with sound and light

3. Oil pressure switch for reducing oil pressure

The switch is bolted to the intake side and near the toothed belt in the cylinder head to determine whether the minimum oil pressure has been reached.When there is no pressure, the oil pressure switch is turned on.If the pressure rises above a certain value, the switch closes.The engine control unit can determine whether the oil pressure in the oil system is sufficient through the closed state of the switch.If the oil pressure drops below the required oil pressure, the oil pressure warning light K3 in the instrument cluster lights up.If the oil pressure switch fails, a fault record will be stored in the fault memory, and the oil pressure warning lamp K3 will light up.