22 · Diagnostics

Engine whilstling / services belt noisy

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Noisy / vibrations › Engine whilstling / services belt noisy

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Fault diagnosisEngine whilstling / services belt noisy

ENGINE WHILSTLING / SERVICES BELT NOISY

There is buzzing (low frequency noise) coming from the engine, whose intensity varies with the number of revs

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
1.2 8v	Check the condition of the auxiliary shaft drive belt and check that the tension is correct.	Check that, as the electrical loads engaged increase, the whistling remains constant Continue to Step 2	Belt worn.	Replace the belt Op. 1092B60
			Tension incorrect	Adjust belt tension Op. 1092B64
			The whistling noise increases.	Continue to Step 1
2	CHECKING ENGINE EXHAUST	All OK	Problems met	Operation
	Check the engine exhaust system and, in particular: Piping Exhaust silencers Catalytic converter gaskets	Continue to Step 3	Pipe damaged	Replace the pipe
			Rear silencer damaged	Replace the silencer Op. 1076B20
			Gasket worn or damaged	Replace the gasket
3	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

There is buzzing (low frequency noise) coming from the engine, whose intensity varies with the number of revs

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
1.9 DIESEL	Check the condition of the auxiliary shaft drive belt and check that the tension is correct.	Check that, as the electrical loads engaged increase, the whistling remains constant Continue to Step 2	Belt worn.	Replace the belt Op. 1092G10
1.9 DIESEL			The whistling noise increases.	Continue to Step 1
1	CHECKING ALTERNATOR	All OK	Problems met	Operation
	Check the alternator is working properly in particular: voltage regulator the connections between the alternator and the battery See E5010 STARTING AND RECHARING	Continue to Step 2	Defective voltage regulator	Replace the alternator Op. 5530A10
		Continue to Step 2	Connections not correct	Restore connections
1.9 DIESEL	Check the alternator is working properly in particular: voltage regulator the connections between the alternator and the battery See E5010 STARTING AND RECHARING	Continue to Step 2	Defective voltage regulator	Replace the alternator Op. 5530A14
1.9 DIESEL		Continue to Step 2	Connections not correct	Restore connections
2	CHECKING AUXILIARY DRIVE BELT	All OK	Problems met	Operation
	Check whether the whistling disappears when the belt is disconnected. Do not let the engine run for long with the belt disconnected	Continue to Step 6	The whistling remains constant	Continue to Step 4
1.9 DIESEL	Check whether the whistling disappears when the belt is disconnected. Do not let the engine run for long with the belt disconnected	Continue to Step 3	The whistling remains constant	Continue to Step 4
3	CHECKING AIR CONDITIONER COMPRESSOR	All OK	Problems met	Operation
1.9 DIESEL	Check the air conditioner air conditioner compressor is working properly.	Continue to Step 6	Air conditioning compressor faulty	Repair the air conditioner compressor Op. 5040A20
4	CHECKING BELT TENSION	All OK	Problems met	Operation
	Check the condition of the belt tensioner bearings	Continue to Step 5	Belt tensioner faulty	Replace the belt tensioner Op. 1092B82
5	WATER PUMP CHECK	All OK	Problems met	Operation
	Check the condition of the water pump	Continue to Step 6	Water pump faulty	Replace the water pump Op. 1088C10
6	CHECKING CORRECT OPERATION	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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Parts & tools for this job For 2000 Fiat Doblò

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