| | Test results |
| 1 | VISUAL INSPECTION | All OK | Problems encountered | Operation |
|---|
| With the system active, the steering wheel spontaneously rotates to the left or the right. | Move on to Step 2 | The steering wheel does not spontaneously rotate to the left or the right. | Replace the electric steering unit. Op. 4110D20 STEERING ELECTRICAL CONTROL DEVICE - R R |
| 2 | VISUAL INSPECTION | All OK | Problems encountered | Operation |
|---|
| Strong steering wheel vibrations with the vehicle stationary, constantly, or in certain steering positions. | Move on to Step 3 | 1. Steering box defective2. No problems are detected in the steering box | 1. DO NOT replace the Electric Steering Unit.2. Replace the electric steering unit. Op. 4110D20 STEERING ELECTRICAL CONTROL DEVICE - R R |
| 3 | GEOMETRY CHECKS | All OK | Problems encountered | Operation |
|---|
| Check that the wheel geometry and tyre wear are correct | Move on to Step 4 | 1. Pressure not correct2. Geometry not correct. | 1. Restore the correct pressure.2. Restore correct geometry. |
| 4 | STEERING HEAVINESS UNIFORMITY CHECK | All OK | Problems encountered | Operation |
|---|
| With the vehicle stationary, check that the heaviness of the steering varies from one end of travel to the other | Move on to Step 5 | The steering heaviness and/or return is uniform. | Do not adjust the EPS system.Check for faults in the steering box and the front suspension assembly. |
| 5 | EXTENT OF THE FAULT CHECK | All OK | Problems encountered | Operation |
|---|
| Check whether the heaviness is slight or more serious. | Move on to Step 6 | 1. The heaviness is slight and occurs during parking manoeuvres.2. The heaviness is quite considerable | 1. Do not intervene; the EPS system does not assist the return of the steering from stationary.2. Move on to Step 6 |
| 6 | MECHANICAL CHECKS | All OK | Problems encountered | Operation |
|---|
| Check that the steering box and the linkage for the steering components are working properly. In particular, make sure that there is no friction that could have an adverse effect on the operation of the components. | End of diagnosis | 1. Defects discovered in the operation of the steering components.2. No problems detected with the steering components | 1. Do not intervene on the Electric Steering unit.2. Replace the electric steering unit. Op. 4110D20 STEERING ELECTRICAL CONTROL DEVICE - R R |
