Diagnosis and testing of oil pressure (A20NFT/LHU)
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Diagnosis and testing of oil pressure (A20NFT/LHU)
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1.
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Park the car on a level surface and let the oil run down for 2-3 minutes and measure if the oil level is low.
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2.
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Add engine oil of the recommended grade and fill the crankcase until the oil level reaches the full level on the dipstick.
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3.
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Run the engine and check whether the oil pressure is low or non-existent on the car's gauges or indicator lamps.
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4.
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Listen for rattling valves or knocking noises.
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5.
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Check for the following conditions:
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Adjust the oil filter with the anti-return line and O-ring on the cylinder block side of the filter.
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Oil that is thinned with humidity or unburned fuel mixtures
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Incorrect oil viscosity for the expected temperature
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Incorrect or malfunctioning engine oil pressure sensor
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Incorrect or malfunctioning engine oil pressure gauge
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Malfunctioning oil bypass valve
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6.
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Remove the engine oil pressure sensor or another oil plug from the engine block.
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7.
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Fit an engine oil pressure gauge and measure the engine oil pressure.
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9.
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If engine oil pressure is below specifications, check the engine with regard to one or more of the following conditions:
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Adjust the oil filter with the anti-return line and O-ring on the cylinder block side of the filter.
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Oil pump strainer loose, clogged or damaged
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O-ring seal to the oil pump strainer is missing or damaged
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Malfunctioning pressure control valve oil pump
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Cracked, porous or narrow oilways
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Oilway plugs missing or incorrectly fitted
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Damaged clearance adjusters
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