| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Having carried out the road test, see the Table S15 RUMOROSITA' in condizioni di marcia there was a knocking noise 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 clearances for the front brake calipers and lubricate the wheel bolt pins |
| The noise is noticeable during take off | Move on to Step 1 1 |
| The noise is more obvious when the wheels are steered | Move on to Step 2 1 |
| The noise increases as the engine torque increases | Move on to Step 4 1 |
| The noise is also present in other conditions | Move on to Step 6 1 |
| 1 | CHECK ON CONSTANT VELOCITY JOINT SLIDING | All OK | Problems encountered | Operation |
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| Raise the vehicle on a two column lift and turn the front wheels by hand. Make sure that there are no impediments to its movement or noise during rotation. | Move on to Step 2 | Constant velocity joint seized | Replace the constant velocity joint Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| 2 | CHECK ON CONSTANT VELOCITY JOINT EFFICIENCY | All OK | Problems encountered | Operation |
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| Try and move the driveshaft and check that there is not excessive clearance for the constant velocity joints | Move on to Step 3 | Gearbox side constant velocity joint chamber broken | Replace the constant velocity joint Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| Wheel side constant velocity joint chamber broken | Replace the constant velocity joint Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| Wheel side joint worn | Replace the constant velocity joint Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| 3 | WHEEL SIDE BOOTS AND WHEEL BEARINGS CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the wheel side boot. If it is not intact, check that there are no leaks or no grease in the actual boot. If everything is okay and the noise was more obvious with the wheels steered, check the wheel bearings. | Move on to Step 4 | Boot broken | Replace the boot Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| Grease leaks/No grease | Renew the correct amount of grease of the appropriate type Op. 2710A20 WHEEL END CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| Wheel bearing faulty | Replace the wheel bearing on the side where the problem occurs, positioning it with the magnetic track towards the outside of the vehicle Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE | This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor |
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| 4 | DIFFERENTIAL SIDE BOOT CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the differential side boot. If it is not intact, check that there are no leaks or no grease in the actual boot. | Move on to Step 5 | Boot broken | Replace the boot Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| Grease leaks/No grease | Renew the correct amount of grease of the appropriate type Op. 2710A24 DIFFERENTIAL END CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT |
| 5 | WHEEL SIDE JOINT TIGHTENING CHECK | All OK | Problems encountered | Operation |
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| Remove the wheel. Op. 4450B02 LEFT FRONT WHEEL R RCheck that the constant velocity joint fastening nut is tightened and that the staking is in place. | Move on to Step 6 | Nut loosening | Replace the nut, restore the torque tightening and stake |
| 6 | OIL LEAKS CHECK | All OK | Problems encountered | Operation |
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| Raise the vehicle on a two column lift and check that there are no oil leaks from the shock absorber stem. Warning: Slight dampness on the stem is considered normal because there is evaporation that takes place during the operation of the shock absorber. If there is a consitent leak of oil on the shock absorber stem make sure that it is not coming from other parts of the vehicle that are lubricated | Move on to Step 7 | Leaks from other parts that are lubricated | Search for the cause of the leak following the appropriate diagnostic procedure |
| | | Leaks from the shock absorber stem | Replace the shock absorber Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/RE-BUILDING OF ASSEMBLY AT BENCH R R |
| 7 | INTERFERENCE CHECK | All OK | Problems encountered | Operation |
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| Check that there are no signs of interference between the suspension elements and the bodyshell and between the latter and the liner.In particular, check that there are no signs of wear on the suspension springs and that they do not show signs of abrasion. | If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation |
| Move on to Step 8 1 | Inteference 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 |
| 8 | TRACK CONTROL ARM CHECK | All OK | Problems encountered | Operation |
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| Check that there is no clearance between track control arm track rod ends and make sure that the boot is intact.In order to do so the guard under the engine must be removed Op. 7055B54 , then loosen the bolt connecting the track control arm to the front steering knuckle.Also check the condition of the suspension bushes | Move on to Step 9 1 | There is clearance or the boot or the bushes are not intact | Replace the track control arm Op. 4410B40 |
| 9 | TIGHTENING TORQUE CHECK | All OK | Problems encountered | Operation |
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| Locate the area of the possible noise source: top or bottom.Starting from the area where the knocking was identified, check See Test 4410A Verifiche corretti serraggi sospensioni anteriori The tightening torques of the fixing bolts for: - Mountings to bodyshell and to shock absorber
- Suspension arm bushes to crossmember
- Track control arms to steering knuckle
- Steering knuckles to shock absorber
- Brake caliper fastenings to steering knuckle
- Anti-roll bar to crossmember
- Crossmember fastenings to bodyshell
- Engine connecting rod fastening to crossmember
- Steering box fastenings to crossmember and steering knuckle
| Move on to Step 10 1 | Torque tightenings not correct | Restore the correct tightness |
| 10 | SHOCK ABSORBER FASTENING CHECKS | All OK | Problems encountered | Operation |
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| Check that there is no clearance between the shock absorber attachment bearing and the rubber mounting and that the bearing is in place | Move on to Step 11 1 | There is clearance for the bearing | Replace the mounting |
| The bearing is not in place | If the bearing is not damaged, fit it correctly. If this is not the case, replace the mounting. |
| 11 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | 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 |