2007 FORD FIESTA steering

100-04-6 Noise, Vibration and Harshness 100-04-6
DIAGNOSIS AND TESTING
2. AccelerationIDeceleration: With slow
acceleration and deceleration, a shake is
sometimes noticed in the steering
wheellcolumn,
seats, front floor panel, front door trim panel or
front end sheet metal. It is a low frequency
vibration (around
9-1 5 cycles per second). It
may or may not be increased by applying the
brakes lightly. REFER to
Idle
BoomIShakeNibration in the Driveline Noise
and Vibration Symptom Chart.
High Speed: A vibration is felt in the front floor
panel or seats with no visible shake, but with
an accompanying sound or rumble, buzz, hum,
drone or booming noise. Coast with the clutch
pedal depressed (manual transmission) or shift
control selector lever in "N" (NEUTRAL)
(automatic transmission) and engine idling. If
vibration is still evident, it may be related to
wheels, tires, front brake discs, wheel hubs or
front wheel bearings. REFER to Shake and
Vibration While Driving in the Driveline Noise
and Vibration Symptom Chart.
4. Engine rpm Sensitive: A vibration is felt
whenever the engine reaches a particular rpm.
It will disappear in neutral coasts. The vibration
can be duplicated by operating the engine at
the problem rpm while the vehicle is stationary.
It can be caused by any component, from the
accessory drive belt to the clutch or torque
converter which turns at engine speed when the
vehicle is stopped. REFER to Shake and
Vibration While Driving in the Driveline Noise
and Vibration Symptom Chart.
5. Noise and Vibration While Turning: Clicking,
popping or grinding noises may be due to the
following:
worn, damaged or incorrectly installed front
wheel bearing.
damaged
powertrainldrivetrain mounts.
Road Conditions
An experienced technician will always establish a
route that will be used for all NVH diagnosis road
tests. The road selected should be reasonably
smooth, level and free of undulations (unless a
particular condition needs to be identified). A
smooth asphalt road that allows driving over a
range of speeds is best. Gravel or bumpy roads
are unsuitable because of the additional road noise produced.
Once the route is established and
consistently used, the road noise variable is
eliminated from the test results.
N0TE:Some concerns may be apparent only on
smooth asphalt roads.
If a customer complains of a noise or vibration on
a particular road and only on a particular road, the
source of the concern may be the road surface. If
possible, try to test the vehicle on the same type
of road.
Vehicle Preparation
Carry out a thorough visual inspection of the
vehicle before carrying out the road test. Note
anything which is unusual. Do not repair or adjust
any condition until the road test is carried out,
unless the vehicle is inoperative or the condition
could pose a hazard to the technician. After
verifying that the condition has been corrected,
make sure all components removed have been
installed.
Power Steering Conditions
c !
Check for the noise in the following conditions to
verify the customer concern.
Check for the noise in several temperature
conditions.
Is the noise from when the vehicle was new?
Can the noise be repeated constantly or is it
random?
Check the condition of the vehicle age, mileage
and service record.
Interview the customer to find the operating
condition in which the noise will occur. Test the
vehicle based on the
detail(s) from the customer
interview.
Follow the power steering operation noise
condition tables below, to find which condition
the noise will occur.
Power Steering Operation Noise Check
Step 1 : Check for NVH concerns from non-steering
components, which may sound like noises coming
from the steering system.
I:. ':
2006.0 Fiesta 121zoo6 G37349en
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I 00-04-8 Noise, Vibration and Harshness 100-04-8
DIAGNOSIS AND TESTING
Steering system NVH concerns Power
assisted steering operating condition
I Steering System operation condition (column A to F) 1
Noise I Driving condition I A
Parking
Moan REFER
to
steering
system NVH
concerns
column A REFER
to
steering
system NVH
concerns
column
B
Driving
Whine REFER
to
steering
system NVH
concerns
column C
Vehicle stationary with engine off
Parking between lock stops, at engine idle and
also increased engine speed REFER
to
steering system
NVH concerns
column
D
REFER to steering
system NVH
concerns column E
X
Hiss REFER
to steering
system NVH
concerns column F
Driving, high engine rpm. Must be present from
1 new
0
b) Holding steering wheel against lock stops. Must
be present from new
a) Parking between lock
stops. Must be present
from new
X
Lock stop impact
knock a) Parking
at lock stop. Must be present from new
Mechanical knock
(power assisted
steering (PAS) off) b)
Parking between lock stops, engine OFF. Must
be present from new
Mechanical Knock c) Parking between lock stops, engine
ON (ball
(PAS on)
1 joint knock)
X
Hammer knock
Column knock
I f) Parking, driving. cobble stones and rough roads I X
- -
d) Parking into lock stop and release (vehicle
hydraulic power assisted steering (HPAS) only,
not for vehicles with electro-hydraulic power
assisted steering (EHPAS))
Hydraulic knock
(clonk)
Column rattle I Mainly driving on rough roads 1 0
e) Driving, cobble stones, rough road (clonk). Must
be present from new
Grinding
I When turning steering wheel I
Steering left and right at high frequency. Must be
present from new
Zip
I At engine start, -1 0°C only I X
X
X = Noise will most likely occur in this operating condition.
0 = Noise can possibly occur in this operating condition.
Blank = Noise is unlikely to occur in this operating condition.
2006.0 Fiesta 1212006 G37349en
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100-04-9 Noise, Vibration and Harshness 1 00-04-9
DIAGNOSIS AND TESTING
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 a vehicle test to identify a
NVH
concern carry out the following checks.
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
- air conditioning (AIC) 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. Engine speed at idle with no steering action.
2. Engine speed at idle with slow 90 degrees per
second turning of the steering wheel.
3. Engine speed at 1250 +I- 50 rpm with no
steering action.
4. Engine speed at 1250 +I- 50 rpm with slow 90
degrees per second turning of the steering
wheel.
2006.0 Fiesta 12/2006 G37349en
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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.
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100-04-1 1 Noise, Vibration and Harshness 100=04=1 I
DIAGNOSIS AND TESTING
2006.0 Fiesta 1212006 G37349en
Symptom
Power steering system whine
noise
- a high pitched buzzing
sound like an electric motor or
drill. Whine occurs at the higher
engine rpm, 1500
- 5000 rpm,
frequency does not change if
system is loaded or not loaded.
Possible Sources
Power steering fluid aeration.
l ncorrect power steering fluid.
Overheated power steering fluid.
'perating condition of
the power steering pump.
Action
BLEED the power steering system.
REFER to: Power Steering System
Bleeding (21 1-00 Steering
System
- General Information,
General Procedures).
FLUSH the power steering system.
REFER
to: (21 1-00 )
Power Steering System
Flushing
- 1.8L 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-
DilTDDi (Puma) Diesel12.0L
Duratorq-TDCi (Puma)
DieselI2.2L Duratorq-TDCi
(Puma) Diesel (General Procedures).
FLUSH the power steering system.
REFER to: (21 1-00
)
Power Steering System
Flushing
- 1.8L 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-
DilTDDi (Puma) Diesel12.0L
Duratorq-TDCi (Puma)
Diesel12.2L Du ratorq-TDCi
(Puma) Diesel (General
Procedures).
Certain amount of noise level
acceptable, not a safety critical
item.
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I 00-04-1 2 Noise, Vibration and Harshness I 00=04m12
DIAGNOSIS AND TESTING
Power Steering Hiss Noise
Test Condition
Listen for steering hiss noise with the vehicle
parked, transmission in neutral and all windows
-
closed in the following test conditions.
Power Steering Lock Stop Impact Knock 1. Turn the steering wheel to the left-hand and
Noise right-hand steering locks and listen for the
impact noise.
Test Condition
Listen for steering knock noise with the engine
speed at idle in the following test conditions (noise
also apparent with engine off).
Action
CHECK the installation and
potential damage of the floor seal.
Certain amount of noise level
acceptable, not a safety critical
item.
Certain amount of noise level
acceptable, not a safety critical
item.
Certain amount of noise level
acceptable, not a safety critical
item.
Symptom
N0TE:Engine speed at idle
turning the steering wheel slowly
lock to lock.
Power steering system hiss noise
- a high frequency, continuous
rush or swish noise like escaping
air from a balloon. Hiss occurs
while turning between the steering
lock stops, all steering angles.
Noise does not change with
engine rpm and is worse at high
operating temperatures.
N0TE:Engine speed at idle
holding the steering wheel against
a steering lock for three seconds.
Do not hold for more than five
seconds.
Power steering system hiss noise
- a continuous noise like escaping
air occurs while holding the
steering against a steering lock
stop.
Possible Sources
Floor seal.
Power steering gear valve design.
Power steering system hydraulic
design.
Power pump pressure
relief valve.
Power Steering Mechanical Knock Noise 1. Turn the steering wheel 90 degrees to the right,
(PAS off) hold and then quickly release.
2. Turn the steering wheel 90 degrees to the left, Test Condition hold and then quickly release.
Listen for steering knock noise with the engine off
in the following test conditions (no power assist).
2006.0 Fiesta 1212006 G37349en
Action
Certain amount of noise level
acceptable, not a safety critical
item.
Symptom
Power steering system knock
noise
- a heavy loud sound like a
knock on a door that occurs in
parking condition when hitting the
lock stop.
Possible Sources
Power steering gear mechanical
noise, metal to metal at end of
steering travel.
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100-04-13 Noise, Vibration and Harshness 100-04-13
DIAGNOSIS AND TESTING
Power Steering Mechanical Knock Noise 1. Turn the steering wheel to a steering lock and
(PAS on) return to center quickly.
2. Turn the steering wheel 90 degrees to the left
Test Condition and then 90 degrees to the right quickly.
Listen for steering knock noise with the engine
speed at idle in the following test conditions (power
assist).
Action
Certain amount of noise level
acceptable, not a safety critical
item.
Certain amount of noise level
acceptable, not a safety critical
item.
Symptom
Power steering system knock
noise - a heavy loud repeating
sound like a knock on a door that
occurs in several driving and
steering conditions.
Power Steering Hammer Knock (Hydraulic) 1. Turn the steering wheel to a steering lock
Noise position and return quickly.
Possible Sources
Power steering system knock
noise
- a damped, metallic knock
noise which only occurs at
steering condition with engine off
(very high efforts),
Tolerances in the steering gear
components.
Test Condition
Action
REFER to Steering System.
REFER to: Steering System (21
1 -
00, Diagnosis and Testing).
Symptom
Power steering system knock
noise - clear knock noise from
steering gear linkage area.
Listen for steering knock noise with the engine
speed at idle in the following test conditions (for
vehicles with hydraulic power assisted steering only, not electro-hydraulic power steering).
Possible Sources
Worn tie-rod ball joints (inner and
outer ball joints).
Symptom Possible Sources Action
hitting the suspension cross- Certain
amount of noise level
by pressure impulse in gear and
return line).
Power Steering Hydraulic KnocWClonk 1. Drive over cobbled roads at low speed 10-30
Noise kmlh (6-20 mph) with and without turning.
2. Drive over straight tar strips road rails or 25 mm
Test Condition tall harshness strips at low speed 10-30 kmlh
Listen for steering knocklclonk noise in the (6-20
mph) both driving straight and with
following test conditions with the windows closed. moderate turning.
2006.0 Fiesta 1212006 G37349en
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100-04-14 Noise, Vibration and Harshness 100-04-14
DIAGNOSIS AND TESTING
Power Steering Column Knock Noise I. Drive over cobbled stones at low speed 16-40
kmlh (1 0-25 mph) with and without steering
Test Condition input carefully listening for knock sounds.
Symptom
Power steering system knock1
clonk noise - sounds almost
identical to column knock that
occurs when driving and cornering
over cobbled stones or rough
roads. Noise may appear to
emanate from a location closer to
the floor than that for column
knock (Sounds like metallic noise
but is created by pressure impulse
in gear and return line
- similar to
a sound like quickly turning off a
water tap).
Listen for steering knock noise in the following test 2. Drive over straight tar strips, road rails or 25 mm
conditions with windows closed. tall
harshness strips at low speed 16-40
kmlh
(10-25 mph) both driving straight and with
moderate cornering.
Possible Sources
Power steering return lines.
High power assist gain of power
steering gear valve (steering gear
design
- no quality issue).
High power steering pump
flow
rate (by design).
Power Steering Toc-Toc Noise 1. Turn the steering wheel from left to right abruptly
changing direction.
Test Condition 2. Drive the vehicle for low speed parking
Listen for steering
toc-toc noise with the engine manoeuvres constantly changing steering
speed at idle and the vehicle parked, automatic direction.
transmission in "P" (PARK) or manual transmission
in neutral and the windows closed.
Action
Certain amount of noise level
acceptable, not a safety critical
item.
Certain amount of noise level
acceptable, not a safety critical
item.
Certain amount of noise level
acceptable, not a safety critical
item.
Symptom
Power steering system column
knock noise
- a loose sounding
rattle or vibration coming from the
column. Noticeable by hearing
and touch.
2006.0 Fiesta 1212006 G37349en
Possible Sources
Steering column or steering
column
Action
CHECK the steering column
retaining bolts and attachments
to the steering column and secure
if necessary.
REFER to: Specifications (21 1
-
04, Specifications).
Check steering column and inter- mediate shaft for free play or
loose components.
REFER to: Steering System (2 11
-
00, Diagnosis and Testing).
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