After carrying out a road test during the diagnosis, a noise is heard from the front identifiable as knocking.

See table S015 NOISE WHILST DRIVING

Continue depending on the circumstances in which the noise occurs

1. The noise disappears when the brake pedal is operated.

2. The noise only occurs whilst accelerating or braking with the wheels steered.

3. The noise is also present in other conditions

1. Check the clearances for the front brake calipers and lubricate the wheel bolt pins

2. Replace the wheel bearing on the side where the problem occurs, positioning it with the magnetic race towards the steering knuckle ring.

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

3. 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, lifting up the dust cover.

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

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. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

For the 1.3 JTD, 1.9 JTD;

Raise the vehicle on a two column lift and rotate the front wheels by hand.

Make sure that there are no impediments to the movement or noise during rotation

Replace the constant velocity joint

Op. 2710A10 DRIVESHAFT WITH JOINTS (ONE), L/H OR R/H - R + R

For the 1.2 8v, 1.4 8v;

Raise the vehicle on a two column lift and rotate the front wheels by hand.

Make sure that there are no impediments to the movement or noise during rotation

Replace the constant velocity joint

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

For the 1.3 JTD, 1.9 JTD;

Try and move the driveshaft and check that there is not excessive clearance for the constant velocity joints

1. Gearbox side constant velocity joint chamber broken

2. Wheel side constant velocity joint chamber broken

3. Wheel side joint worn

1. Replace the constant velocity joint

Op. 2710A52 DIFFERENTIAL SIDE SLIDING JOINT (ONE) L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Replace the constant velocity joint

Op. 2710A52 DIFFERENTIAL SIDE SLIDING JOINT (ONE) L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

3.Replace the constant velocity joint

Op. 2710A52 DIFFERENTIAL SIDE SLIDING JOINT (ONE) L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

For the 1.2 8v, 1.4 8v;

Try and move the driveshaft and check that there is not excessive clearance for the constant velocity joints

1. Gearbox side constant velocity joint chamber broken

2. Wheel side constant velocity joint chamber broken

3. Wheel side joint worn

1. Replace the constant velocity joint

Op. 2710A52 DIFFERENTIAL SIDE SLIDING JOINT (ONE) L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Replace the constant velocity joint

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

3.Replace the constant velocity joint

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

For the 1.3 JTD, 1.9 JTD;

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 pronounced whilst steering, check the wheel bearings

1. Boot broken

2. Grease leaks/No grease

3. Wheel bearing faulty

1. Replace the boot

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Renew the correct amount of grease of the appropriate type

3. Replace the wheel bearing on the side where the problem occurs, positioning it with the magnetic race towards the steering knuckle ring.

Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE

For the 1.2 8v, 1.4 8v;

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 pronounced whilst steering, check the wheel bearings

1. Boot broken

2. Grease leaks/No grease

3. Wheel bearing faulty

1. Replace the boot

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Renew the correct amount of grease of the appropriate type

3. Replace the wheel bearing on the side where the problem occurs, positioning it with the magnetic race towards the steering knuckle ring.

Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE

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.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation.

1. Inteference 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 taking care to fit it correctly

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

Check that there is no clearance between the ball joint pin and the steering knuckle and between the ball joint flange and the track control arms and make sure that the boot is intact.

In order to do this it is necessary to remove the guard under the engine, then loosen the bolt connecting the track control arm to the front steering knuckle.

Op. 7055B54 UNDER ENGINE PROTECTION/GUARD - R.R.

Also check the condition of the suspension bushes.

1. Track control arm clearance

2. Ball joint boot not intact

3. Track control arm front bush not intact

4. Track control arm rear bush not intact

1. Replace the track rod end

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

2. Replace the track rod end

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

3. Replace the track control arm front bush

Op. 4410B50 BUSHES FOR L/H OR R/H FRONT SUSPENSION LOWER TRACK CONTROL ARM - REPLACE AT BENCH

4. Replace the track control arm rear bush

Op. 4410B52 FRONT SUSPENSION LOWER TRACK CONTROL ARM REAR BUSH LEFT OR RIGHT - REPLACE AT BENCH

For the 1.3 JTD, 1.9 JTD;

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

1. Boot broken

2. Grease leaks/No grease

1. Replace the boot

2. Renew the correct amount of grease of the appropriate type

For the 1.2 8v, 1.4 8v;

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

1. Boot broken

2. Grease leaks/No grease

1. Replace the boot

Op. 2710A52 DIFFERENTIAL SIDE SLIDING JOINT (ONE) L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Renew the correct amount of grease of the appropriate type

1.3 JTD, 1.9 JTD;

Remove the left and/or right wheel.

Op. 4450B02 LEFT FRONT WHEEL - R.R

Op. 4450B04 RIGHT FRONT WHEEL - R.R

Check that the constant velocity joint fastening nut is tightened and that the staking is in place.

Replace the nut, restore the torque tightening and stake

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

1.2 8v, 1.4 8v;

Remove the left and/or right wheel.

Op. 4450B02 LEFT FRONT WHEEL - R.R

Op. 4450B04 RIGHT FRONT WHEEL - R.R

Check that the constant velocity joint fastening nut is tightened and that the staking is in place.

Replace the nut, restore the torque tightening and stake

Op. 2710A20 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), L/H OR R/H - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

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 standard fixing bolts:

See Test 4410OA CHECKS ON CORRECT TIGHTENINGS FOR FRONT SUSPENSION

- fastening shock absorber stem to mounting on turret;

- fastening shock absorber stem to end of travel plate on turret;

- fastening track rod end to steering knuckle;

- front fastening securing crossmember to body side member;

- rear inner fastening securing crossmember to body side member;

- rear outer fastening securing crossmember to body side member;

- anti-roll bar to crossmember fastenings;

- fastenings on power assisted steering box crossmember;

- fastenings securing band to crossmember; (not for 1.2 8v version)

- connecting rod between anti-roll bar and shock absorber fastenings;

- front brake caliper fastenings.

Visually inspect that the yield point type bolts have not loosened, the list is given below:

- steering knuckle to shock absorber bracket fastening;

- fastening for front bush to the track control arm;

- fastening for rear bush to the track control arm;

- fastening securing engine suspension connecting rod to crossmember.

Also check that the four special anti-slip washers are present where the crossmember is attached to the bodyshell at the rear (inside and outside).

1. Tightenings for standard bolts not correct

2. Shear bolts loosened

3. Special anti-slip washers not present / worn

1. Restore the correct tightening

2. Replace the shear bolts and restore the correct tightness

3. Place new special anti-slip washers on the (inner and outer) rear mountings between the crossmember and the bodyshell.

After having disconnected the upper track rod end for the shock absorber connecting rod, check that the anti-roll bar does not come down quickly.

See Test 4410CA CHECKS ON FRONT ANTI-ROLL BAR

Also check that there is not excessive clearance for the pins connected to the bar and to the shock absorber bracket.

1. The anti-roll bar comes down quickly

2. Excessive clearance for the connecting rod connecting pins

1. Replace the anti-roll bar

Op. 4410C10 FRONT SUSPENSION ANTI-ROLL BAR - R+R - CHECK WHEEL GEOMETRY SEPARATELY

2. Replace the connecting rod

Op. 4410C12 FRONT SUSPENSION ANTI ROLL BAR JOINT (END) (ONE), LH OR RH - R.R

Remove the shock absorber and check that there is no clearance between the shock absorber mounting bearing and the rubber mounting encasing it

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

Replace the mounting

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

The fault is due to another system (engine, clutch, differential).

Search for the cause in one of these systems, following the appropriate diagnostic procedures