Steering wheel oscillations / vibrations / whilst driving

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Steering – vehicle behaviour › Steering wheel oscillations / vibrations / whilst driving

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Fault diagnosisSteering wheel oscillations / vibrations / whilst driving

STEERING WHEEL OSCILLATIONS / VIBRATIONS / WHILST DRIVING

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

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	First check that the tyres are the correct type, in good condition and correctly inflated. Check that the wheels are correctly secured.	Move on to Step 1	1. Tyre inflation pressure not correct	1. Restore the correct tyre inflation pressure
			2. Tyres unsuitable or worn	2. Replace the tyres
			3. Wheel not correctly fastened	3. Tighten the wheels correctly.
1	WHEEL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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	1. Balance the wheels
		Move on to Step 2	2. Rims dented or distorted	2. Replace the rims
2	WHEEL ALIGNMENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the wheel alignment.	Move on to Step 3	Alignment not correct.	Restore the correct vehicle alignment
3	ENGINE SUSPENSION FLEXIBLE MOUNTINGS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the engine frame, supports and connecting rod connecting the engine to the suspension frame.	Move on to Step 4	1. Engine flexible mountings 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. Connecting rod faulty.	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. Suspension frame faulty.	3. Adjust the fastenings: loosen the bolts, centre them in their housings and tighten them to the recommended torque.
4	BUSHES AND FLEXIBLE MOUNTINGS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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.	1. Replace the rods Op. 4110B10 STEERING LINKS - R+R ON VEHICLE - CHECK TOE-IN/TOE-OUT SEPARATELY
			2. Bushes for arms worn or damaged.	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. Anti-roll bar flexible mountings worn or damaged.	3. Replace the flexible mountings Op. 4410C12 FRONT SUSPENSION ANTI ROLL BAR JOINT (END) (ONE), LH OR RH - R.R
5	SPRING SHOCK ABSORBER ASSEMBLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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.	1. Renew the correct fastening
			2. Shock abosrbers not working properly	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. Springs not working properly.	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
6	STEERING RODS AND ARMS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the steering rods and arms	Move on to Step 7	1. Rods damaged or worn	1. Replace the rods or joints Op. 4110B10 STEERING LINKS - R+R ON VEHICLE - CHECK TOE-IN/TOE-OUT SEPARATELY
	Check the condition of the steering rods and arms	Move on to Step 7	2. Arms damaged or worn	2. Replace the steering box Op. 4130A15 POWER STEERING BOX R R WITH FRONT SUSPENSION FRAME REMOVED
7	STEERING COLUMN BEARINGS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the steering column support bearings and that they are working properly	End of diagnosis	Bearings worn or damaged.	Restore the efficiency of the steering column. If necessary, replace the bearings involved.

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Parts & tools for this job For 2005 Fiat Croma

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