| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Visually
inspect the power assisted steering fluid level in the reservoirCarry out a test by steering on full lock and then releasing
the steering wheel | Continue to Step 1 | Level too low | Restore the correct level.
if there are leaks, See table X30 |
| The noise increases towards the end of travel position
and with the engine speed (roaring) | Continue to Step 2 |
| The noise remains constant | No intervention of any sort is needed: the noise is due
to the by-pass valve discharing excess pressure |
| The noise is a hissing/whistling | Continue to Step 4 |
| The noise is a hissing/whistling | Continue to Step 4 |
| 1 | POWER ASSISTED STEERING FLUID RESERVOIR
CHECK | All
OK | Problems
met | Operation |
|---|
| Check: - reservoir breather plug
- actual filter
| Continue to Step 2 | Breather plug blocked | Clean or replace the plug Op. 4130B14 |
| Filter dirty or blocked | Replace the reservoir Op. 4130B10 |
| 2 | POWER ASSISTED STEERING FLUID QUALITY
CHECK | All
OK | Problems
met | Operation |
|---|
| Visually
inspect the power assisted steering fluid in the reservoir.- Make sure that there is no emulsified
oil (oil which is lighter in colour and with bubbles)
- make sure that the oil is not "old" (darker colour)
| Continue to Step 3 | "Old" fluid | Eliminate air leaks from
the power steering system pipes Op. 4130B10 |
| "Old" fluid | Replace the power assisted steering fluid Op. 4130B10 |
| 3 | POWER ASSISTED STEERING PIPES CHECK | All OK | Problems met | Operation |
|---|
| Check
whether there are any restrictions in the system pipes, flexible
and rigid | Continue to Step 4 | Pipes faulty | Replace the damaged parts,
replacing all the seals (see Assembly 4310B) |
| 4 | POWER ASSISTED STEERING PUMP CHECK | All OK | Problems met | Operation |
|---|
| Carry
out a test rotating the steering wheel slightly firstly with the
engine running and then with it switched off: check that the knocking
takes place both with the engine running and with it switched off | Continue to Step 5 | With the engine running
there is a knocking noise, with the engine switched off it disappears | Replace the power assisted
steering pump Op. 4130B20 |
| 5 | CHECK THE STEERING LINK | All OK | Problems met | Operation |
|---|
| Check
the condition of the steering link. | Continue to Step 6 | Tie-rods damaged or worn | Replace the links Op. 4110B10 |
| 6 | STEERING COLUMN BEARINGS CHECK | All OK | Problems met | Operation |
|---|
| Check
that there is not too much play in the steering column; check the
condition and the efficiency of the steering column support bearings | Continue to Step 7 | Bearings worn or damaged | Replace the bearings involved Op. 4110A31 |
| 7 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Check
that the fault is no longer present | End of diagnosis | Fault persists | Search for the
fault starting from another symptom' |
