Power Steering Moan Noise - Ford Transit 2002 Owner's Manual

Before conducting a vehicle test to identify a NVH concern carry out the following checks.
1. 1. Check the tire pressures and adjust to specification, as necessary.
2. 2. Make sure the steering system fluid is correct, the system is free of leaks and is
operating correctly.
3. 3. Make sure the vehicle steering system temperature is the same as described at the
customer interview.
4. 4. All evaluations must take place in a relatively quiet location.
5. 5. The heating - air conditioning (A/C) fan and radio must be turned off during
evaluations and the windows closed.
Symptom Chart

Power Steering Moan Noise

Test Condition
Listen for steering moan noise with the vehicle parked, transmission in neutral and all
windows closed in the following test conditions.
1. 1. Engine speed at idle with no steering action.
2. 2. Engine speed at idle with slow 90 degrees per second turning of the steering
wheel.
3. 3. Engine speed at 1250 +/- 50 rpm with no steering action.
4. 4. Engine speed at 1250 +/- 50 rpm with slow 90 degrees per second turning of the
steering wheel.
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.
Possible
Sources
CHECK the routing of the power
steering lines.
CHECK the power steering line
Power
clamps are secure.
steering
CHECK the power steering lines
lines.
for clearance from the vehicle
body, front axle crossmember
and steering gear.
FLUSH the power steering system.
REFER to:
Power Steering System Flushing -
1.8L Duratec- DOHC (85kW/115PS)
- Zetec
Incorrect
General Information, General
power
Procedures),
steering
Power Steering System Flushing -
fluid.
1.8L Duratorq-TDCi (Lynx)
Diesel/1.8L Duratorq-TDDi (Lynx)
Diesel
General Information, General
Procedures).
Power Pressure pulses from the power steering
http://vnx.su
Action
(211-00 Steering System -
(211-00 Steering System -