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Home >> Ford >> 2005 >> Focus ZX5 S, Automatic >> Repair and Diagnosis >> General Information >> OEM General Information >> Noise, Vibration And Harshness >> Diagnosis And Testing >> Noise, Vibration and Harshness (NVH) >> Power Steering Operation Noise Check >> Steering system NVH concerns

Steering system NVH concerns

STEERING SYSTEM NVH CONCERNS

Steering System operation condition (column A to F)
Moan Parking between lock stops, at engine idle and also increased engine speed X O        
Whine Driving, high engine RPM. Must be present from new. O O X X    
Hiss a) Parking between lock stops. Must be present from new. X X O O    
  b) Holding steering wheel against lock stops. Must be present from new. X          
Lock Stop Impact Knock a) Parking at lock stop. Must be present from new.   X       X
Mechanical Knock (PAS off) b) Parking between lock stops, engine off. Must be present from new.         X  
Mechanical Knock (PAS on) c) Parking between lock stops, engine on (ball joint knock) X          
Hammer Knock d) Parking into lock stop and release (vehicle with hydraulic power assisted steering (HPAS) only, not for vehicles with electro-hydraulic power assisted steering (EHPAS))   X        
Hydraulic Knock (clonk) e) Driving, cobble stones, rough road (clonk). Must be present from new.     O X    
Column Knock f) Parking, driving, cobble stones and rough roads X X O X X X
Column rattle Mainly driving on rough roads O   X X O  
Toc-toc Steering left and right at high frequency. Must be present from new. X          
Grinding When turning steering wheel X     O X  
Zip At engine start, low temperatures below -10°C only X O        
  • X = Noise will most likely occur in this operating condition.
  • O = Noise can possibly occur in this operating condition.
  • Blank = Noise is unlikely to occur in this operating condition.

Step 3: According to each identified operating condition (Column A, B, C, D, E, F), check each possible Steering System NVH concern with the detail symptom charts below.

Before conducting vehicle test to identify a NVH concern, inspect the vehicle.

  1. Check the tire pressures and adjust to specification, as necessary.
  2. Make sure the steering system fluid is correct, the system is free of leaks and is operating correctly.
  3. Make sure the vehicle steering system temperature is the same as described at the customer interview.
  4. All evaluations must take place in a relatively quiet location.
  5. The heating - A/C fan and radio must be turned off during evaluations and the windows closed.
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