|
STEP |
CHECK TO BE PERFORMED |
REMEDIAL ACTION IF THE CHECK IS NOT OK |
|
1 |
Before proceeding with the test, check that the vehicle tyre inflation pressure is correct |
Restore the correct tyre inflation pressure |
|
2 |
Check that the wheels are correctly balanced |
Rebalance the wheels |
|
3 |
Start up the engine and, with the vehicle stationary (switch off the ASR using the special button), check that no noise is coming from the front area. |
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, checking that there are no unusual noises and that there are no unusual noises with the gearbox in neutral |
Continue as instructed in the |
|
5 |
Set off from stationary to check that there is no metallic noise or roughness |
Continue as instructed in the |
|
6 |
Again from a standing start, check that there are no transverse vibrations |
Continue as instructed in the |
|
7 |
Carry out a road test on an unsurfaced road, engaging the various gears |
Continue as instructed in the |
|
8 |
Carry out a road test on a surfaced road, engaging the various gears when cornering |
Continue as instructed in the |
|
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 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 |
The noise is caused by the brake discs or rear drums 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 |
|
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 |
|
14 |
Carry out a road test on an unmade road (cobblestones) to define the type of noise, checking that there is no creaking from the front area |
Continue as instructed in the |
|
15 |
Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no whistling from the front area |
Continue as instructed in the |
|
16 |
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 area |
Continue as instructed in the |
|
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 |
|
18 |
Carry out a road test on an unmade road (transverse tracks, cobblestones) to define the type of noise, checking that there is no whistling from the rear area |
Continue as instructed in the |
|
19 |
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 area |
Continue as instructed in the |
|
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, subsequent checks require greater care on the side in question. Also check for transverse vibrations accompanied by noise. If there are, continue as indicated in the |