Checking the pressure reducing valve
1. At high speeds, the amount of oil supplied by the oil pump is excessive compared to the amount required to lubricate the rubbing pairs. The pressure-reducing valve prevents excess oil supply. At low speeds, the pressure-reducing valve closes the bypass channel under the action of the spring. At high speeds, the oil pressure increases, the force of the oil pressure overcomes the force of the spring, the pressure-reducing valve opens, and excess oil returns through the bypass channel back to the sump.
2. Using a wooden rod, press the valve plunger and check that the plunger moves to its original position without sticking. If the valve plunger is found to be stuck, replace the valve.
Checking the engine oil pressure sensor
1. Check the engine oil level.
2. Disconnect the engine oil pressure sensor connector.
Engine 4G15.
Engine 4G93.
3. Using a special key, remove the sensor.
Caution: The thread of the engine oil pressure sensor is sealed with sealant, be careful not to damage the sensor when removing it.
4. Connect the measuring device (pressure gauge) via the adapter.
5. Start the engine and let it idle (warm up).
6. After warming up the engine, check that the oil pressure corresponds to the nominal value.
Nominal value:
- Idle speed - 29 kPa or more
- 3500 rpm - 294 - 686 kPa
7. Disconnect the measuring device (pressure gauge).
8. Apply sealant to the threads of the engine oil pressure sensor.
Sealant Three Bond 1215 or equivalent
Caution: Be careful when applying the sealant so that it does not clog the oil passage.
b) Install and tighten the sensor to the specified tightening torque.
Tightening torque:
- Engine 4G15 — 16 - 22 Nm
- Engine 4G93 - 8-12 Nm
Caution: After installing the oil pressure switch, wait at least one hour before starting the engine.
9. Connect the engine oil pressure sensor connector.