Power Steering Whine Noise - Ford 2007 WQ Fiesta Repair Manual

100-04-1 0 Noise, Vibration and Harshness 100-04-10
DIAGNOSIS AND TESTING
Power Steering Whine Noise
2. Engine speed at 1800 +/- 50 rpm with slow 90
degrees turning of the steering wheel.
Test Condition
3. Engine speed at 3000 +I- 50 rpm with no
Listen for steering whine noise with the vehicle
steering action.
parked, transmission in neutral and all windows
4. Engine speed at 3000 +I- 50 rpm with slow 90
closed in the following test conditions.
degrees turning of the steering wheel.
1. Engine speed at 1800 +I- 50 rpm with no
steering action.
Symptom
Power steering system moan
noise
-
A continuous low pitched
humming noise occurs when the
steering wheel is turned and the
steering system is loaded. Noise
frequency changes with engine
rpm changes. Particularly
annoying at lower engine speed.
2006.0 Fiesta
1212006 G37349en
Possible Sources
Power steering lines.
Incorrect power steering fluid.
Power steering pump.
Action
CHECK the routing of the
power steering lines.
CHECK the power steering line
clamps are secure.
CHECK the power steering
lines for clearance from the
vehicle body, front axle cross-
member and steering gear.
FLUSH the power steering
system. REFER to: (21 1-00 )
Power Steering System
Flushing
-
I .8L Duratec-HE
(M14)/1.8L Duratec-SCi
(M14)/2.OL Duratec-HE (M14)
(General Procedures),
Power Steering System
Flushing
-
3.OL Duratec-SE
(VE6)/2.5L Duratec-VE
(VE6)/3.OL Duratec-ST (VE6)
(General Procedures),
Power Steering System
Flushing
-
2.OL Duratorq-
DirrDDi (Puma) Diesel12.0L
Duratorq-TDCi (Puma)
Diesell2.2L Duratorq-TDCi
(Puma) Diesel (General
Procedures).
Pressure pulses from the power
steering pump. Certain amount of
noise level acceptable, not a
safety critical item.