| | Test results |
| 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 back.Continue depending on the circumstances in which the noise occurs | End of diagnosis | The noise disappears when the brake pedal is operated. | The noise disappears when the handbrake is operated Op. 3380A04 HANDBRAKE - ADJUST TRAVEL |
| | | The noise is also present in other conditions. | 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 of the vehicle that are lubricated | Move on to Step 2 | 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. 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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| 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 the buffer is correctly fitted in its housing. | Move on to Step 4 | Buffer not correctly fitted. | Replace the end of travel buffer Op. 4420A40 L/H OR R/H REAR SUSPENSION COIL SPRING (ONE) - 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 See Test 4420Bon non-shear bolts:- upper shock absorber attachment to the body;- lower shock absorber attachment to the knuckle;- longitudinal arm to the knuckle;- for the brake caliper to steering knuckle;Visually inspect that the yield point type bolts have not loosened, the list is given below:- beam fastening to the body;- fastening of the antiroll bar to the beam;- fastenings of the connection beam to the bar and knuckle;- fastening of the longitudinal arm connection bracket to the body- fastenings of the upper wishbone to the beam and knuckle;- fastenings of the large lower wishbone to the beam and knuckle;- fastenings of the small lower wishbone to the beam and knuckle;- of the knuckle to the bearing. | Move on to Step 5 | Non-shear bolts not tightened to torque | Restore the correct tightness |
| Shear bolts loosened | Replace the shear bolts and restore the correct tightness |
| 5 | LONGITUDINAL ARM CHECK | All OK | Problems encountered | Operation |
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| Check for damage to the bush securing the longitudinal arm to the body. | Move on to Step 6 | Damage to the bush fastening the longitudinal arm to the body. | Replacement of longitudinal arm Op. 4420C30 L/H OR R/H REAR SUSPENSION TIE ROD (ONE) - R+R |
| 6 | UPPER WISHBONE CHECK | All OK | Problems encountered | Operation |
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| Check for clearance in the upper wisbhone attachment to the knuckle and rear frame.Also check the condition of the upper wishbone bushes. | Move on to Step 7 | There is clearance or the bushes are not intact. | Replacement of upper transverse arm Op. 4420B35 REAR SUSPENSION UPPER SWINGING ARM, (ONE) LH OR RH - R R WITH CHECK OF WHEELS ATTITUDE APART |
| 7 | LARGE LOWER WISHBONE CHECK | All OK | Problems encountered | Operation |
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| Check for clearance in the large lower wisbhone attachment to the knuckle and rear frame.Also check the condition of the large lower wishbone bushes. | Move on to Step 8 | There is clearance or the bushes are not intact. | Replacing the large lower wishbone Op. 4420B18 REAR SUSPENSION REAR WISHBONE (ONE) - R Rchecking the camber values are correct Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY |
| 8 | SMALL LOWER WISHBONE CHECK | All OK | Problems encountered | Operation |
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| Check for clearance in the small lower wisbhone attachment to the knuckle and rear frame.Also check the condition of the small lower wishbone bushes. | Move on to Step 9 | There is clearance or the bushes are not intact. | Replacing the small lower wishbone Op. 4420B16 REAR SUSPENSION FRONT WISHBONE (ONE)- R Rchecking the toe-in values are correct Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY |
| 9 | ANTI-ROLL BAR CHECK | All OK | Problems encountered | Operation |
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| After disconnecting the upper ball joint on the connection bar to the knuckle, check that the antiroll bar is resistant to manual movement when symmetrical forces are applied. | Move on to Step 10 | The antiroll bar is not resistant to manual movement when symmetrical loads are applied. | Replace the anti-roll bar Op. 4420C10 REAR SUSPENSION STABILIZER BAR - R+R |
| 10 | 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. |
