| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
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| Having carried out the road test during the See table S15 RUMOROSITA'' in condizioni di marcia, a knocking noise is heard coming from the front.Continue depending on the circumstances in which the noise occurs | End of diagnosis | The noise disappears when the brake pedal is operated | Check the clearance for the front brake calipers and lubricate the wheel bolt pins |
| The noise disappears when the brake pedal is operated | Replace the wheel bearing on the side that the problem occurs Op. 4450C32 , positioning it with the magnetic race towards the vehicle exteriorWarning: This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because this could adversely affect the gap and prevent the sensor giving a correct reading |
| The noise disappears when the brake pedal is operated | Continue to Step 1 |
| 1 | CHECK FOR OIL LEAKS | All OK | Problems met | Operation |
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| Raise the vehicle on a two collumn lift and check that there are no oil leaks from the shock absorber stem | Slight dampness of the stem is considered normal because there is evaporation that takes place during the operation of the shock absorber. If there is a consistent oil leak at the shock absorber stem, make sure that it is not coming from other parts of the vehicle that are lubricated |
| Continue to Step 2 | Leaks from other parts that are lubricated | Search for the cause of the leak by following the appropriate diagnostic procedure |
| Leaks from the shock absorber stem | Replace the shock absorber Op. 4410A10 ) |
| 2 | INTERFERENCE CHECK | All OK | Problems met | Operation |
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| Check that there are no signs of interference between the suspension elements or between the latter and the bodyshell.In particular, check that there are no signs of wear at the suspension springs and that they do not suffer from abrasions | If the spring shows signs of abrasions, its mechanical properties could be adversely affected as a result of oxidation |
| Continue to Step 3 | Interference due to incorrect fitting | Eliminate the interference and restore the correct fastening If this is not possible, replace the defective components |
| Abrasions or non conformity of the spring | Replace the spring Op. 4410A12 taking care to fit it correctly |
| 3 | TRACK CONTROL ARM CHECK | All OK | Problems met | Operation |
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| Check that there is no clearance between the track control rod ends and that the bush is intactTo do this it it necessary to remove the guard under the engine Op. 7055B54 , then loosen the bolt connecting the track control arm to the front steering knuckleAlso check the condition of the suspension bushes | Continue to Step 4 | There is clearance or the boot or bushes are not intact | Replace the track control arm Op. 4410B40 |
| 4 | TIGHTENING TORQUE CHECK | All OK | Problems met | Operation |
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| Locate the area that is the possible source of the noise: top or bottom.Starting from the area where the knocking was located, check See Test 4410A Verifiche corretti serraggi sospensioni anteriori The tightening torques of the bolts fixing the: - Mountings
- Bushes
- Track control arms
- Steering knuckles
- Anti-roll bar
| Continue to Step 5 | Tightenings not to torque | Restore the correct tightening |
| 5 | SHOCK ABSORBER FASTENING CHECKS | All OK | Problems met | Operation |
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| Check that there is no clearance between the shock absorber mounting bearing and the rubber mounting and that the bearing is fitted in the correct direction, by carrying out the See Test 4410AB Verifica tassello in gomma e cuscinetto su ammortizzatore anteriore | Continue to Step 6 | There is clearance in the bearing | Replace the bearing |
| The bearing is fitted in the wrong direction | If the bearing is not damaged, fit it correctly. If this is not the case, replace it. |
| 6 | Continue as instructed by the tester | All OK | Problems met | Operation |
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| Check that the fault is no longer present | End of diagnosis | Fault persists | The fault is due to another system (engine, clutch, differential). Search for the cause in one of these systems, following the appropriate diagnostic procedures |