| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| Having carried out the road test, see the Table S15 RUMOROSITA' in condizioni di marcia , there was a knocking noise from the back.Continue depending on the circumstances in which the noise occurs | End of diagnosis | The noise disappears when the handbrake is operated | Eliminate the handbrake lever and/or actual handbrake clearance |
| The noise is also present in other conditions | Move on to Step 1 1 |
| 1 | OIL LEAKS CHECK | All OK | Problems encountered | Operation |
|---|
| 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 of the vehicle that are lubricated |
| Move on to Step 2 1 | Leaks from other parts that are lubricated | Search for the cause of the leak following the appropriate diagnostic procedure |
| Leaks from other parts that are lubricated | Replace the shock absorber Op. Op. 4420A30 L/H OR R/H REAR SUSPENSION DAMPER (ONE) - R+R |
| 2 | HANDBRAKE CHECK | All OK | Problems encountered | Operation |
|---|
| 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 1 | 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 |
|---|
| 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 abrasionCheck that the buffer reaction mounting is correctly fitted and that the plastic fastening pins on the axle have not deteriorated | If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation |
| Move on to Step 4 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 as a result of oxidation | Replace the spring Op. Op. 4420A48 REAR SUSPENSION COIL SPRINGS- R Rtaking care to fit it correctly |
| Buffer reaction mounting not correctly fitted causing absence/deterioration of plastic fixing lugs on the axle | Replace the end of travel buffer |
| 4 | TIGHTENING TORQUE CHECK | All OK | Problems encountered | Operation |
|---|
| Locate the area of the possible noise source: top or bottom.Starting from the area where the knocking was identified, check the tightening torques See Test 4420B Verifiche corretti serraggi sospensioni posteriori Of the bolts fixing: - Shock absorber
- Axle brackets to bodyshell
- Axle to brackets
- Stub axle plate
| Move on to Step 5 1 | Torque tightenings not correct | Restore the correct tightness |
| 5 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
|---|
| 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 |