TEST RESULTS

Having carried out the road test, during the

 See table S015 NOISE WHILST DRIVING

there was a knocking noise from the back.

Continue depending on the circumstances in which the noise occurs.

End of diagnosis

1. The noise disappears when the handbrake is operated

2. The noise is also present in other conditions.

1. Eliminate the handbrake lever and/or handbrake clearance

2. Move on to Step 1.

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 lubricated.

2. Leaks from the shock absorber stem.

1. Search for the cause of the leak following the appropriate diagnostic procedure

2. Replace the shock absorber

 Op. 4420A30 REAR SUSPENSION SHOCK ABSORBER (ONE), LEFT OR RIGHT - R.R. - CHECK WHEEL GEOMETRY SEPARATELY

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

Interference 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.

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. Interference due to incorrect fitting.

2. Abrasions or non conformity of the spring.

1. Eliminate the interference and restore the correct fastening. If this is not possible, replace the defective components

2. Replace the spring

 Op. 4420A40 REAR SUSPENSION COIL SPRING (ONE), LEFT OR RIGHT - R.R.

taking care to fit it correctly.

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 4420OB CORRECT TIGHTENINGS FOR REAR SUSPENSION CHECKS

of the 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.

Move on to Step 5

Torque tightenings not correct.

Restore the correct tightening.

Check that the fault is no longer present.

End of diagnosis

The fault persists.

The knocking is caused by another system (the fuel float in the tank, for example). Carry out appropriate checks to identify the source of the noise.