| | 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 banging when the steering wheel is in
the centre |
Continue to Step
4
|
| 1 | POWER ASSISTED STEERING FLUID RESERVOIR
CHECK | All
OK | Problems
met | Operation |
|---|
| Verify: - reservoir breather plug
- actual filter
|
Continue to Step
2
| Breather plug blocked | Clean or replace the plug |
| 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) |
Continue to Step
3
| Emulsified fluid | Eliminate any air penetration
through the power assisted steering system pipes (see Assembly 4310B) |
| 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 | STEERING TIE-RODS AND ARMS CHECK | All OK | Problems met | Operation |
|---|
| Check
the condition of the steering tie-rods and arms. |
Continue to Step
6
| Rods or arms damaged or
worn |
Replace
the steering box
Op. 4130A10 |
| 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. 4110A30 |
| 7 | HECK ON 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' |
