17 · Body & interior

Road test to identify noise

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: General › Road test to identify noise

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Body fittingsRoad test to identify noise

ROAD TEST TO IDENTIFY NOISE

Check 70B

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Before proceeding with the test, check that the tyre inflation pressure is correct.	Restore the correct tyre inflation pressure.
2	Check that the wheels are correctly balanced	Rebalance the wheels Op. 4450B40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES POSSIBLE ADJUSTMENT
3	Start up the engine and, with the vehicle stationary (switch off the ASR using the special button), check that the noise from the front area is not present.	The cyclical noises are due to the power unit. The test can be considered over
4	Steer, with the vehicle stationary, to the left and the right and check that there is no irregular noise and check that there is no irregular noise with the gearbox in neutral.	Continue as instructed in the See table S022 GEARBOX NOISE - IN NEUTRAL
5	Set off from stationary to check that there is no metallic noise or roughness.	Continue as instructed in the See table S021 GEARBOX NOISE - AT TAKE OFF
6	Still setting off from stationary, check that there are no transverse vibrations.	Continue as instructed in the See table S019 FORECARRIAGE TRANSVERSE VIBRATIONS
7	Carry out a road test on an unmade road engaging the various gears.	Continue as instructed in the See table S023 GEARBOX NOISE - IN A SPECIFIC GEAR
8	Carry out a road test on an unmade road engaging the various gears when cornering.	Continue as instructed in the See table S024 GEARBOX NOISE - WHEN CORNERING
9	With the help of a colleague, check that the noise is not due to one of the dashboard components not being properly fastened (when your hand is placed on top of it the noise either lessens or disappears).	The noise is due to creaking of the interior/exterior dashboard components. The test can be considered over
10	If the vehicle is fitted with a sun roof, check that the noise is not being caused by the later by opening and closing it and placing your hand on it to quieten any noise.	The noise is due to the sun roof. The test can be considered over
11	Brake in safe conditions to check whether the noise is only present during braking as a result of the brake discs.	The noise is caused by the brake discs. The test can be considered over
12	Pull the handbrake lever gently, whilst driving in a straight line, to check whether the noise disappears.	Adjust the handbrake travel Op. 3380A04 HANDBRAKE - ADJUST TRAVEL
13	During the previous check, make sure that there are no transverse vibrations during the pull and release stages. Increase the speed and check that there is no metallic noise, possibly accompanied by transverse vibrations which vary according to the vehicle speed or engine revs.	Continue as instructed in the See table S019 FORECARRIAGE TRANSVERSE VIBRATIONS
14	Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no creaking/clicking from the rear area.	Continue as instructed in the See table S016 FRONT SUSPENSION NOISE (CREAKING/SQUEAKING)
15	Carry out a road test on an unmade road (cobblestones) to define the type of noise, checking that there is no whistling from the front area.	Continue as instructed in the See table S017 FRONT SUSPENSION NOISE (WHISTLING/HUMMING)
16	Carry out a road test on an unmade road (cobblestones) to define the type of noise, checking that there is no knocking from the front area.	Continue as instructed in the See table S018 FRONT SUSPENSION NOISE (KNOCKING)
17	Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no creaking from the rear area.	Continue as instructed in the See table S026 REAR NOISE (CREAKING/SQUEAKING/TICKING)
18	Carry out a road test on an unmade road (cobblestones) to define the type of noise, checking that there is no whistling from the rear area.	Continue as instructed in the See table S027 REAR NOISE (WHISTLING/HUMMING)
19	Carry out a road test on an unmade road (cobblestones) to define the type of noise, checking that there is no knocking from the rear area.	Continue as instructed in the See table S028 REAR NOISE (KNOCKING)
20	Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no knocking from the front seats.	Continue as instructed in the See table S065 SEATS CREAKING
21	Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no knocking from the front seat cushion area.	Continue as instructed in the See table S067 KNOCK ON FRONT SEAT CUSHION
22	Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no knocking from the rear seat cushion area.	Continue as instructed in the See table S071 REAR SEAT BACKREST KNOCK

When carrying out Steps 14 to 19, steering in safe conditions to determine whether the noise is present especially when steering and whether it is more noticeable on one of the two sides.

In the latter case, the subsequent checks should be carried out more carefully on the side in question.

Also check that there are no transverse vibrations accompanied by noise. In this case, continue as indicated in the

See table S019 FORECARRIAGE TRANSVERSE VIBRATIONS

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Parts & tools for this job For 2005 Fiat Croma

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