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The warning light of oil-water separator is always on. What's the matter? What's the solution?

1. The function of the oil-water separator is to separate water by using the gravity difference between fuel and water before the fuel enters the fuel injection pump;

2. The warning light of the oil-water separator is always on, which generally does not belong to the problem of accessories. When the oil-water separator is used for a period of time, there will be accumulated water inside, and the indicator light will be on when the water reaches a certain limit;

3. When the warning light of the oil-water separator is on, you can unscrew the water drain valve under the oil-water separator's storage tank to drain the water. At this time, the liquid level of the oil-water separator drops below the sensor, and the indicator light naturally goes out;

4. If the water under the oil-water separator liquid storage tank is drained, the indicator light is still on, and the fault point may be on the oil-water separator sensor. Use a multimeter to detect the voltage of the oil-water separator sensor, which should be 12V and 5V normally. If it is abnormal, replace the oil-water separator sensor after eliminating the circuit problem or poor contact.

Extended information:

Circuit detection method of oil-water separation sensor:

1. The oil-water separation sensor has three wires, one is a power line (a), one is a ground line (b) and the other is a signal line (c);

2. Turn off the ignition switch, unplug the oil-water separation sensor, then turn on the ignition switch, and measure the voltage of the three terminals (wires output from the control unit) of the socket hole with a digital multimeter. The normal voltage between A and B should be 12V, and the normal voltage between A and C should be 5V.

Fault judgment and treatment method of Daokebaba-oil-water separator, maintenance of oil-water separator and sensor in automobile maintenance technology network.