22 · Diagnostics

Engine buzzing

Fault diagnosisEngine buzzing

ENGINE BUZZING

There is a constant, loud noise coming from the area of the engine, which is repeated at constant intervals

1	CHECK AUXILIARY SHAFT BELT	All OK	Problems met	Operation
		Results of the tests
1.6 16v	Check the water pump and alternator belt tensioners and, in particular, the bearings	Continue to Step 2	Belt tensioner bearings damaged	Replace the mobile belt tensioner Op. 1092B82
1.9 JTD 8V	Check the belt tensioners and, in particular, the bearings	Continue to Step 2	Fixed belt tensioner bearings damaged	Replace the fixed belt tensioner Op. 1092G20
1.9 JTD 8V	Check the belt tensioners and, in particular, the bearings	Continue to Step 2	Mobile belt tensioner bearings damaged	Change the mobile belt tensioner Op. 1092G14
2	CHECK ON WATER PUMP	All OK	Problems met	Operation
	Check the water pump and in particular: the condition of the bearing	Continue to Step 3	Water pump bearing damaged	Replace the water pump Op. 1088C12
3	ALTERNATOR CHECK	All OK	Problems met	Operation
	Check the alternator and, in particular: the condition of the bearing that the pulley is correctly fixed	Continue to Step 4	Alternator bearing damaged	Service the alternator Op. 5530A18and replace if necessary
		Continue to Step 4	Pulley fixing not correct	Restore the correct pulley fastening Op. 5530A30
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

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