22 · Diagnostics

Noise front / round bends

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
Section: Noisy / vibrations › Noise front / round bends

‹ Prev Noise ' rear / whilst driving over unmade road Next › Noise front / at take-off

Fault diagnosisNoise front / round bends

NOISE FRONT / ROUND BENDS

With the vehicle driving, there is a constant noise from the front, especially when steering

When driving in a straight line this noise disappears.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Visually inspect the power assisted steering fluid level in the reservoir Carry out a test by steering on full lock and then releasing the steering wheel	Continue to Step 1	Level too low	Restore the correct level. if there are leaks, See table X30
			The noise increases towards the end of travel position and with the engine speed (roaring)	Continue to Step 2
			The noise remains constant	No intervention of any sort is needed: the noise is due to the by-pass valve discharing excess pressure
			The noise is a hissing/whistling	Continue to Step 4
			The noise is a hissing/whistling	Continue to Step 4
1	POWER ASSISTED STEERING FLUID RESERVOIR CHECK	All OK	Problems met	Operation
	Check: reservoir breather plug actual filter	Continue to Step 2	Breather plug blocked	Clean or replace the plug Op. 4130B14
	Check: reservoir breather plug actual filter	Continue to Step 2	Filter dirty or blocked	Replace the reservoir Op. 4130B10
2	POWER ASSISTED STEERING FLUID QUALITY CHECK	All OK	Problems met	Operation
	Visually inspect the power assisted steering fluid in the reservoir. Make sure that there is no emulsified oil (oil which is lighter in colour and with bubbles) make sure that the oil is not "old" (darker colour)	Continue to Step 3	"Old" fluid	Eliminate air leaks from the power steering system pipes Op. 4130B10
		Continue to Step 3	"Old" fluid	Replace the power assisted steering fluid Op. 4130B10
3	POWER ASSISTED STEERING PIPES CHECK	All OK	Problems met	Operation
	Check whether there are any restrictions in the system pipes, flexible and rigid	Continue to Step 4	Pipes faulty	Replace the damaged parts, replacing all the seals (see Assembly 4310B)
4	POWER ASSISTED STEERING PUMP CHECK	All OK	Problems met	Operation
	Carry out a test rotating the steering wheel slightly firstly with the engine running and then with it switched off: check that the knocking takes place both with the engine running and with it switched off	Continue to Step 5	With the engine running there is a knocking noise, with the engine switched off it disappears	Replace the power assisted steering pump Op. 4130B20
5	CHECK THE STEERING LINK	All OK	Problems met	Operation
	Check the condition of the steering link.	Continue to Step 6	Tie-rods damaged or worn	Replace the links Op. 4110B10
6	STEERING COLUMN BEARINGS CHECK	All OK	Problems met	Operation
	Check that there is not too much play in the steering column; check the condition and the efficiency of the steering column support bearings	Continue to Step 7	Bearings worn or damaged	Replace the bearings involved Op. 4110A31
7	CHECKING 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'

‹ Prev Noise ' rear / whilst driving over unmade road Next › Noise front / at take-off

Parts & tools for this job For 1998 Fiat Multipla

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