| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| After carrying out a road test during diagnosis, a noise is heard from the rear identifiable as knocking. See table S015 NOISE WHILST DRIVINGContinue depending on the circumstances in which the noise occurs | End of diagnosis | 1. The noise disappears when the handbrake is operated2. The noise is also present in other conditions | 1. Eliminate the handbrake lever and/or actual handbrake clearance2. Move on to Step 1 |
| 1 | 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 | Slight dampness on the stem is considered normal because there is evaporation during the operation of the shock absorber |
If there is a persistent oil leak on the shock absorber stem, make sure that it is not coming from other parts that are lubricated | Move on to Step 2 | 1. Leaks from other parts that are lubricated2. Leaks from the shock absorber stem | 1. Search for the cause of the leak following the appropriate diagnostic procedure2. Replace the shock absorber Op. 4420A30 REAR SUSPENSION SHOCK ABSORBER (ONE), LEFT OR RIGHT - R.R. - CHECK WHEEL GEOMETRY SEPARATELY |
| 2 | HANDBRAKE CHECK | All OK | Problems encountered | Operation |
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| Position the vehicle on a two column lift and raise it.Check that the handbrake cables or outer casing do not knock against the fuel tank, heat shields or bodywork during oscillations. | Move on to Step 3 | Inteference between outer casing or cables and other elements | Cover the outer casing with foam rubber tape in the area of the interference or lubricate the cable |
| 3 | INTERFERENCE CHECK | All OK | Problems encountered | 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 on the suspension springs and that they do not show signs of abrasion | Move on to Step 4 | 1. Inteference due to incorrect fitting2. Abrasions or non conformity of the spring | 1. Eliminate the interference and restore the correct fastening. If this is not possible, replace the defective components2. Replace the spring taking care to fit it correctly Op. 4420A48 REAR SUSPENSION COIL SPRINGS - R.R. |
| 4 | 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 the tightening torques for the following bolts:- securing the axle bracket to the bodyshell;- securing the bush to the axle bracket;- lower shock absorber fastening;- fastening the shock absorber mounting to the bodyshell;- fastening the rear brake caliper to the stub axle See Test 4420OB CHECKS ON CORRECT TIGHTENINGS FOR REAR SUSPENSION | Move on to Step 5 | Torque tightenings not correct | Restore the correct tightening |
| 5 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Check that the fault is no longer present | End of diagnosis | The fault persists | The knocking is caused by another system (e.g. the fuel float in the tank).Carry out the appropriate checks to identify the cause of the noise |
