2. Start the engine and check if the oil pressure is low or normal on the vehicle gauge or on the oil level indicator light. Listen for valve sequence sounds or tapping sounds.
3. Check the following:
- Is the oil diluted with moisture or mixtures of unburned fuel
- Does the viscosity of the engine oil match the expected temperature?
- Is the oil gauge sensor correct and correct?
- Is the oil pressure gauge correct and correct?
- Is the oil filter clogged?
- Is the oil filter bypass valve defective?
- Remove the oil pressure sensor from the oil filter adapter.
- Install the KM-135 oil gauge adapter and the KM-498-B oil gauge in place of the oil pressure switch.
- Start the engine and then allow the engine to reach normal operating temperature.
- Measure the engine oil pressure at idle speed.
- The minimum oil pressure must be 200 kPa (29 psi inch).
4. If the engine oil pressure falls below the minimum specification, check the engine for the following possible causes:
- Oil pump worn or dirty
- Oil pump relief valve failed
- Oil pump guard loose, clogged or damaged
- Excessive clearance in bearings
- Cracked, porous or obstructed oil passages
- Oil passage plugs in the engine block are missing or incorrectly installed
- Broken valve lifters
- Bad oil filter adapter
5. After checking the oil pressure, remove the oil pressure gauge and adapter, and then set the oil pressure switch to 40 Nm (30 lb-ft).
6. Check the oil level. If necessary, add oil up to the MAX mark.