| | Results of the tests |
| 1 | CHECK ON TYPE OF NOISE | All OK | Problems met | Operation |
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| Check that the noise is not the metallic/mechanical type over unmade roads | Continue to Step 6 | The noise is the metallic/mechanical type | Continue to Step 2 |
| 2 | MECHANICAL CHECK | All OK | Problems met | Operation |
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| Check the condition of the steering column gear and/or steering box supports. | Continue to Step 6 | The bearing is intact. | Replace the EPS system steering column. |
| The bearing is damaged | Replace the system electric motor Op. 4110D30 |
| 3 | CHECK ON CONDITIONS IN WHICH THE FAULT OCCURS | All OK | Problems met | Operation |
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| Check whether the noise persists even without the driver's Air Bag | Continue to Step 4 | The fault does not occur after the driver's Air Bag has been removed | Do not adjust the EPS system, but the Air Bag system |
| 4 | CHECK ON CONDITIONS IN WHICH THE FAULT OCCURS | All OK | Problems met | Operation |
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| Check that the noise continues unchanged after the steering wheel has been turned in both directions | Continue to Step 5 | The noise lessens when the steering wheel is turned in both directions | Replace the EPS system intermediate shaft |
| 5 | CHECK ON CONDITIONS IN WHICH THE FAULT OCCURS | All OK | Problems met | Operation |
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| Check whether the noise alters according to the steering conditions (clockwise rotation, anti-clockwise, steering wheel aligned) | Continue to Step 6 | The noise is the same in all steering conditions (clockwise rotation, anti-clockwise, steering wheel aligned) | Replace the insulator (flexible coupling) |
| 6 | CHECK ON CONDITIONS IN WHICH THE FAULT OCCURS | All OK | Problems met | Operation |
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| Check the intensity of the noise when steering in a clockwise direction | End of diagnosis | The noise lessens when the steering wheel is turned in a clockwise direction | Replace the EPS system Op. 4110D20 |