22 · Diagnostics

Low engine oil pressure

Fault diagnosisLow engine oil pressure

LOW ENGINE OIL PRESSURE

1.6 TS, 2.0 TS

The warning light indicates a decrease in pressure in the engine lubrication circuit.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the engine oil level is correct Check the condition of the oil sump and ensure there are no external macroscopic leaks	Continue to Step 1	Oil level low	Top up the engine oil level
1	CHECKING OIL PRESSURE SENDING UNIT SENSOR	All OK	Problems met	Operation
	Check the sending unit and wiring are working properly	Continue to Step 2	Sending unit faulty	Replace sender unit
	Check the sending unit and wiring are working properly	Continue to Step 2	Wiring short circuited	Arrange wiring
2	CHECK LUBRICATION SYSTEM PRESSURE	All OK	Problems met	Operation
	Check the pressure of the lubrication system Op. 0510C20	Continue to Step 3	Pressure low	With the oil sump removed, check the pressuer limiter valve. If OK, check the oil pump. If the pump is also OK, carry on to Continue to Step 3
3	CHECK ON LUBRICATION SYSTEM	All OK	Problems met	Operation
	Check: seal of crankshaft channel plugs main bearing/connecting rod bearing clearance	Continue to Step 4	Caps faulty	Replace the plugs
		Continue to Step 4	Excessive clearance	Replace the bearings
4	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

1.9 JTD 16V

The warning light indicates a decrease in pressure in the engine lubrication circuit.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check: that the engine oil level is correct that there are no leaks from the lubrication circuit	Continue to Step 1	Oil level low	Top up the engine oil level
		Continue to Step 1	Leaks detected	Eliminate the leaks
1	CHECK LUBRICATION SYSTEM PRESSURE	All OK	Problems met	Operation
	Check that the lubrication system pressure is correct Op. 0510C20	Continue to Step 4	Low engine oil pressure	Continue to Step 2
2	CHECK ON LUBRICATION SYSTEM	All OK	Problems met	Operation
	Check that the engine oil pump is working properly Op. 1084B18	Continue to Step 3	Oil pump faulty	Replace the oil pumpOp. 1084B10
3	CHECK ON LUBRICATION SYSTEM	All OK	Problems met	Operation
	Check: seal of crankshaft channel plugs main bearing/connecting rod bearing clearance	Continue to Step 4	Caps faulty	Replace the plugsOp. 1024A20
		Continue to Step 4	Excessive clearance	Restore correct clearance
4	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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