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Fiat Grande Punto Factory Service Manual (2005-2012)22 · Fault diagnosis
22 · Diagnostics

Steering wheel oscillations / vibrations / whilst driving

Make
Fiat
Model
Grande Punto Factory Service Manual
Year
2005–2012
Section
Steering – vehicle behaviour › Steering wheel oscillations / vibrations / whilst driving
Fault diagnosisSteering wheel oscillations / vibrations / whilst driving

STEERING WHEEL OSCILLATIONS / VIBRATIONS / WHILST DRIVING

There are rapid oscillations in the steering on a straight road at speed

Results of the tests
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
First of all check the type, state and inflation pressure of the tyres. Check that the wheels are correctly fastenedMove on to Step 1

1. Tyre inflation pressure not correct

2. Tyres unsuitable or worn

3. Wheel not correctly fastened

1. Restore the correct tyre inflation pressure

2. Replace the tyres

3. Tighten the wheels correctly

1WHEEL CHECKAll OKProblems encounteredOperation

Check:

- That the wheels are correctly balanced;

- The condition of the wheel rims (they should not show signs of dents or distortions)

Move on to Step 2

1. Wheels not balanced

2. Rims dented or distorted

1. Balance the wheels

2. Replace the rims

2WHEEL ALIGNMENT CHECKAll OKProblems encounteredOperation
Check the wheel alignmentMove on to Step 3Alignment not correctRestore the correct vehicle alignment
3ENGINE FLEXIBLE MOUNTINGS CHECKAll OKProblems encounteredOperation
Check the condition of the engine frame, supports and connecting rod connecting the engine to the mechanical crossmemberMove on to Step 4

1. Engine flexible mountings faulty

2. Reaction connecting rod faulty

3. Mechanical crossmember faulty

1. Adjust the fastenings: loosen the bolts, centre them in their housings and tighten them to the recommended torque.

Op. 1008A POWER UNIT FASTENINGS

2. Adjust the fastenings: loosen the bolts, centre them in their housings and tighten them to the recommended torque.

Op. 1008C POWER UNIT REACTION ELEMENTS

3. Adjust the fastenings: loosen the bolts, centre them in their housings and tighten them to the recommended torque.

4BUSHES AND FLEXIBLE MOUNTINGS CHECKAll OKProblems encounteredOperation

Check the condition of the bushes and mountings. In order:

- steering box rod pin with joint;

- lower track control arm bushes;

- anti-roll bar flexible mountings

Move on to Step 5

1. Steering box rod pin with joint worn or damaged

2. Bushes for arms worn or damaged

3. Anti-roll bar flexible mountings worn or damaged

1. Replace the rods

Op. 4110B10 STEERING LINKS - R+R ON VEHICLE - CHECK TOE-IN/TOE-OUT SEPARATELY

2. Replace the lower track control arms

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

3. Replace the flexible mountings

5SPRING SHOCK ABSORBER ASSEMBLY CHECKAll OKProblems encounteredOperation

Check:

- The condition of the shock absorbers and springs and that they are working properly;

- The fastenings for the spring/shock absorber assembly.

Move on to Step 6

1. Tightening not correct

2. Shock abosrbers not working properly

3. Springs not working properly.

1. Renew the correct fastening

2. Replace the shock absorber involved

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

3. Replace the spring involved

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

6STEERING RODS AND ARMS CHECKAll OKProblems encounteredOperation
Check the condition of the steering rods and armsMove on to Step 7

1. Rods damaged or worn

2. Arms damaged or worn

1. Replace the rods or joints

Op. 4110B10 STEERING LINKS - R+R ON VEHICLE - CHECK TOE-IN/TOE-OUT SEPARATELY

2. Replace the steering box

7CHECK STEERING COLUMN BEARINGSAll OKProblems encounteredOperation
Check the condition of the steering column support bearings and that they are working properlyEnd of diagnosisBearings worn or damagedRestore the efficiency of the steering column. If necessary, replace the bearings involved

Parts & tools for this job For 2005 Fiat Grande Punto

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