Gauge used to check engine oil pressure and oil pressure sensor performance
- A - oil pressure sensor,
- 3 - pressure gauge ground wire
If the oil pressure warning light comes on and the horn sounds while the engine is running, this may be due to the following reasons:
- the oil level is below normal;
- the presence of a malfunction in the electrical circuit of the pressure sensor and the control lamp;
- unsatisfactory operation of the oil pump;
- too much clearance in the crankshaft bearings.
If the oil pressure warning light comes on with the engine running, turn off the engine immediately. Using the dipstick to measure the engine oil level, check the oil level and top up if necessary. Run the engine at idle and check that the oil pressure warning light is no longer on. In this case, you can continue driving.
If the engine oil level is normal and the oil pressure warning light is on, do not drive on your own, but have the vehicle towed to a workshop to have the oil pressure checked.
If the oil pressure is correct, check the oil pressure sensor and sensor circuit.
To check the oil pressure and the oil pressure sensor, you must use a special pressure gauge into which the oil pressure sensor can be screwed.
Examination
1. Check the engine oil level and top up if necessary.
2. Warm up the engine to normal operating temperature.
3. Unscrew the oil pressure gauge from the oil filter holder and screw it into the pressure gauge, see fig. A pressure gauge used to check the engine oil pressure and the operation of the oil pressure sensor.
4. Screw the pressure gauge adapter in place of the oil pressure gauge into the oil filter holder.
5. Connect the pressure gauge ground wire to the vehicle ground.
6. Using additional wires, connect the control LED to the positive terminal of the battery and the contact of the oil pressure sensor. The LED should be on.
7. Start the engine and gradually increase the engine speed. At an overpressure of 1.2–1.6 bar for petrol engines and 0.75–1.05 bar for diesel engines, the LED should turn off. Otherwise, the oil pressure sensor is defective.
8. Increase engine speed to 2,000 rpm. At an oil temperature of +80°C, the excess oil pressure must be at least 2.0 bar. Less oil pressure indicates worn crankshaft bearings.
9. Continue increasing engine speed further. The oil pressure must not exceed 7.0 bar. Otherwise, the bypass valve has failed and it is necessary to replace the oil pump cover with the bypass valve.
10. Reinstall the oil pressure switch with a new O-ring and tighten to 25 Nm.
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