| TEST RESULTS |
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Having carried out the road test See table S015 NOISE WHILST DRIVINGthere was a knocking noise from the front.Continue depending on the circumstances in which the noise occurs. | End of diagnosis. | 1. The noise disappears when the brake pedal is operated.2. The noise occurs whilst accelerating or braking with the wheels steered.3. The noise only occurs during acceleration or braking. | 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 fault occurred Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE fitting it with the magnetic track facing the steering knuckle seal | 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 |
| 1 | OIL LEAKS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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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, lifting up the dust cover.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.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 |
| 2 | CHECK ON CONSTANT VELOCITY JOINT SLIDING | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Raise the vehicle on a two column lift and turn the front wheels by hand. Make sure that there are no impediments to its movement or noise during rotation. | Move on to Step 3. | 1. Constant velocity joint seized. | 1.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 | CHECK ON CORRECT TIGHTENING OF DIFFERENTIAL SIDE JOINT FLANGE | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the bolts fixing the differential side joint flange are correctly tightened. | Move on to Step 4. | 1. Torque tightenings not correct. | 1. Restore the correct tightening. |
| 4 | CHECK ON INTERFERENCE BETWEEN DRIVESHAFTS AND SURROUNDING PARTS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that there is no interference between the driveshafts and adjacent parts (track control arms, front crossmember). | Move on to Step 5. | Interference between the driveshafts and adjacent parts. | Restore the correct tightening of the elements causing interference. |
| 5 | CHECK ON CONSTANT VELOCITY JOINT EFFICIENCY | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Try and move the driveshaft and check that there is not excessive clearance for the constant velocity joints. | Move on to Step 6. | 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 |
| 6 | WHEEL SIDE BOOTS AND WHEEL BEARINGS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| 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. | Move on to Step 7. | 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 Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE on the side where the problem occurs, positioning it with the magnetic race towards the steering knuckle ring. |
| 7 | INTERFERENCE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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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. | If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation. |
| Move on to Step 8. | 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 components2.Replace the spring. Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R taking care to fit it correctly. |
| 8 | TRACK CONTROL ARM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| 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 so the guard under the engine must be removed.then loosen the bolt connecting the track control arm to the front steering knuckle.Also check the condition of the suspension bushes. | Move on to Step 9. | 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 control arm. 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 control arm. 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.4. Replace the track control arm rear bush. |
| 9 | DIFFERENTIAL SIDE BOOT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| 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. | Move on to Step 10. | 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 |
| 10 | WHEEL SIDE JOINT TIGHTENING CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Remove the left wheel. Op. 4450B02 LEFT FRONT WHEEL - R.R and/or the right one. Op. 4450B04 RIGHT FRONT WHEEL - R.R Check that the constant velocity joint fastening nut is tightened and that the staking is in place. | Move on to Step 11. | Nut loosening | 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 |
| 11 | TIGHTENING TORQUE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Locate the area of the possible noise source: top or bottom.Starting from the area where the knocking was identified See Test 4410OA CHECKS ON CORRECT TIGHTENINGS FOR FRONT SUSPENSIONthe tightening torques of the fixing bolts:- fastening shock absorber stem to mounting on turret;- fastening shock absorber stem to end of travel plate on turret;- steering knuckle to shock absorber bracket fastening;- crossmember to bodyshell fastening;- crossmember to strut fastening;- anti-roll bar to crossmember fastenings;- fastenings on power assisted steering box crossmember;- 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:- fastening for front bush to the track control arm;- fastening for rear bush to the track control arm;- fastening track rod end to steering knuckle. | Move on to Step 12. | 1. Tightenings for standard bolts not correct.2. Yield point type bolts loosened. | 1. Restore the correct tightening.2. Replace the yield point type bolts and restore the correct tightening. |
| 12 | ANTI-ROLL BAR CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check: See Test 4410CA CHECKS ON FRONT ANTI-ROLL BARafter having disconnected the upper track rod end for the shock absorber connecting rod, check that the anti-roll bar does not come down quickly.Also check that there is not excessive clearance for the pins connected to the bar and to the shock absorber bracket. | Move on to Step 13. | 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 |
| 13 | SHOCK ABSORBER FASTENING CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Remove 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 and check that there is no cl |