3233163 - S35 NOISE ' POWER ASSISTED STEERING / END OF TRAVEL

Whilst the steering is being operated, there is a noise when the end of travel position is reached
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
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 lowRestore 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 1
The noise remains constant (hissing during steering, puffing on release)No intervention of any sort is needed: the noise is due to the by-pass valve discharing excess pressure
1POWER ASSISTED STEERING FLUID QUALITY CHECKAll OKProblems metOperation
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 2 Emulsified fluid Eliminate air leaks from the power steering system pipes Op. 4310B10
2POWER ASSISTED STEERING PIPES CHECKAll OKProblems metOperation
Check whether there are any restrictions in the system pipes, flexible and rigid Continue to Step 3 Pipes faultyReplace the damaged parts, replacing all the seals (see Assembly 4130B)
3POWER ASSISTED STEERING PUMP CHECKAll OKProblems metOperation
Check that the power assisted steering pump is working properly Continue to Step 4 Power assisted steering pump malfunction Replace the power assisted steering pump Op.   4130B20 
4CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'