test G FORD MUSTANG 2003 Workshop Manual

z
91- 99 — Hardware certification levels
z 01- 04 — Preliminary levels
z 00 — Job 1 production (initial certification)
z 05- 09 — Pre-job 1 revisions to calibrations
z 10- 89 — Post-job 1 revisions to calibrations
z 0B — Durability test level
z BD — On-board diagnostics (OBD) intermediate level (pre- 05) Klj . 16 ba
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DESCRIPTION AND OPERATION
Noise, Vibration and Harshness (NVH)
Noise is any undesirable sound, usually unpleasant in nature. Vibration is any motion, shaking or
trembling, that can be felt or seen when an object moves back and forth or up and down. Harshness is
a ride quality issue where the vehicle's response to the road transmits sharply to the customer.
Harshness normally describes a firmer than usual response from the suspension system. Noise,
vibration and harshness (NVH) is a term used to describe these conditions, which result in varying
degrees of dissatisfaction. Although, a certain level of NVH caused by road and environmental
conditions is normal. This section is designed to aid in the diagnosis, testing and repair of NVH
concerns.
Acceptable Noise, Vibration and Harshness
All internal combustion engines and drivelines produce some noise and vibration; operating in a real
world environment adds noise that is not subject to control. Vibration isolators, mufflers and dampers
reduce these to acceptable levels. A driver who is unfamiliar with a vehicle can think that some sounds
are abnormal when actually the sounds are normal for the vehicle type. For example, Traction-
Lok®
differentials produce a slight noise on slow turns after extended highway driving. This is acceptable
and has no detrimental effect on the locking axle function. As a technician, it is very important to be
familiar with vehicle features and know how they relate to NVH concerns and their diagnosis. For
example, if the vehicle has automatic overdrive, it is important to test drive the vehicle both in and out
of overdrive mode.
Diagnostic Theory
The shortest route to an accurate diagnosis results from:
zsystem knowledge, including comparison with a known good system.
z system history, including repair history and usage patterns.
z condition history, especially any relationship to repairs or sudden change.
z knowledge of possible sources.
z using a systematic diagnostic method that divides the system into related areas.
The diagnosis and correction of noise, vibration and harshness concerns requires:
za road or system test to determine the exact nature of the concern.
z an analysis of the possible causes.
z testing to verify the cause.
z repairing any concerns found.
z a road test or system test to make sure the concern has been corrected or brought back to
within an acceptable range.
Glossary of Terms SECTION 100-
04: Noise, Vibration and Harshness 2003 Mustang Workshop Manual Klj . 1 ba
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starting point.
Decibel
A unit of measurement, referring to sound pressure level, abbreviated dB.
Drive Engine Run-
Up (DERU) Test
The operation of the engine through the normal rpm range with the vehicle standing still, the brakes
applied and the transmission engaged. This test is used for noise and vibration checks.
Driveline Angles
The differences of alignment between the transmission output shaft, the driveshaft, and the rear axle
pinion centerline.
Driveshaft
The shaft that transmits power to the rear axle input shaft (pinion shaft). In a two- piece driveshaft, it is
the rearmost shaft.
Drivetrain
All power transmitting components from the engine to the wheels; includes the clutch or torque
converter, the transmission, the transfer case, the driveshaft, and the front or rear drive axle.
Drivetrain Damper
A weight attached to the engine, the transmission, the transfer case, or the axle. It is tuned by weight
and placement to absorb vibration.
Drone
A low frequency (100- 200 Hz) steady sound, like a freezer compressor. Also described as a moan.
Drumming
A cycling, low-frequency (20- 100 Hz), rhythmic noise often accompanied by a sensation of pressure on
the ear drums. Also described as a low rumble, boom, or rolling thunder. Dynamic Balance Klj . 5 ba
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A mid-
range frequency (200- 800 Hz) noise between drumming and whine. Also described as a hum.
Hum
Mid- frequency (200- 800 Hz) steady sound, like a small fan motor. Also described as a howl.
Hz
Hertz; a frequency measured in cycles per second.
Imbalance
Out of balance; heavier on one side than the other. In a rotating component, imbalance often causes
vibration.
Inboard
Toward the centerline of the vehicle.
Intensity
The physical quality of sound that relates to the strength of the vibration (measured in decibels). The
higher the sound's amplitude, the higher the intensity and vice versa.
Isolate
To separate the influence of one component to another.
Knock
A heavy, loud, repetitious sound, like a knock on the door.
Moan
A constant, low- frequency (100-200 Hz) tone. Also described as a hum.
Neutral Engine Run- Up (NERU) Test
The operation of the engine through the normal rpm range with the vehicle standing still and the
transmission disengaged. This test is used to identify engine related vibrations.
Neutralize/Normalize
To return to an unstressed position. Used to describe mounts. Refer to Bound Up.
Outboard
Away from the centerline of the vehicle.
Ping
A short duration, high- frequency sound, which has a slight echo. Klj . 7 ba
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Pinion Shaft
The input shaft in a driving axle that is usually a part of the smaller driving or input hypoid gear of a
ring and pinion gearset.
Pitch
The physical quality of sound that relates to its frequency. Pitch increases as frequency increases and
vice versa.
Pumping Feel
A slow, pulsing movement.
Radial/Lateral
Radial is in the plane of rotation; lateral is at 90 degrees to the plane of rotation.
Rattle
A random and momentary or short duration noise.
Ring Gear
The large, circular, driven gear in a ring and pinion gearset.
Road Test
The operation of the vehicle under conditions intended to produce the concern under investigation.
Roughness
A medium-
frequency vibration. A slightly higher frequency (20 to 50 Hz) than a shake. This type of
vibration is usually related to drivetrain components. Runout Item Description
1 Lateral runout
2 Radial runout Klj . 8 ba
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WOT
The acronym for wide open throttle is WOT.
Tools and Techniques
Electronic Vibration Analyzer (EVA)
The EVA is a hand-
held electronic diagnostic tool which will assist in locating the source of
unacceptable vibrations. The vibration sensor can be remotely mounted anywhere in the vehicle for
testing purposes. The unit displays the three most common vibration frequencies and their
corresponding amplitudes simultaneously. A bar graph provides a visual reference of the relative
signal strength (amplitude) of each vibration being displayed and its relative G force. The keypad is
arranged to make the EVA simple to program and use. Some of the functions include the ability to
average readings as well as record, play back and freeze readings. The EVA has a strobe balancing
function that can be used to detect imbalance on rotating components such as a driveshaft or engine
accessories.
The EVA allows for a systematic collection of information that is necessary to accurately diagnose and
repair NVH problems. For the best results, carry out the test as follows:
a. Test drive the vehicle with the vibration sensor inside the vehicle.
b. Place the sensor in the vehicle according to feel. „If the condition is felt through the steering wheel, the source is most likely in the front of
the vehicle.
„ A vibration that is felt in the seat or floor only will most likely be found in the driveline,
drive axle or rear wheels and tires.
c. Record the readings. Also note when the condition begins, when it reaches maximum intensity, and if it tends to diminish above/below a certain speed.
„Frequencies should be read in the "average" mode. Item Description
1 EVA screen
2 Frequency mode displayed in rpm or Hz
3 Active sensor input (A or B)
4 Current active mode
5 G force indicators or the strongest frequencies in descending strength of each vibration
6 Strength of each vibration
7 Frequency in rpm/Hz of each vibration Klj . 11 ba
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„
Frequencies have a range of plus or minus 2. A reading of 10 Hz can be displayed as an
8 Hz through 12 Hz.
d. Place the vibration sensor on or near the suspect area outside the vehicle.
e. Continue the road test, driving the vehicle at the speed the symptom occurs, and take another reading.
f. Compare the readings.
„A match in frequency indicates the problem component or area.
„ An unmatched test could indicate the concern is caused by the engine, torque converter,
or engine accessory. Use the EVA in the rpm mode and check if concern is rpm related.
„ Example: A vibration is felt in the seat. Place the sensor on the console. Record the
readings. Place the vibration sensor on the rear axle. Compare the readings. If the
frequencies are the same, the axle is the problem component.
Vibrate Software®
Vibrate Software® ( Rotunda tool number 215- 00003) is a diagnostic aid which will assist in pinpointing
the source of unacceptable vibrations. The engine's crankshaft is the point of reference for vibration
diagnosis. Every rotating component will have an angular velocity that is faster, slower, or the same as
the engine's crankshaft. Vibrate Software® calculates the angular velocity of each component and
graphically represents these velocities on a computer screen and on a printed vibration worksheet.
The following steps outline how Vibrate Software® helps diagnose a vibration concern:
zEnter the vehicle information. Vibrate will do all the calculations and display a graph showing
tire, driveshaft and engine vibrations.
z Print a Vibration Worksheet graph. The printed graph is to be used during the road test.
z Road test the vehicle at the speed where the vibration is most noticeable. Record the vibration
frequency (rpm) and the engine rpm on the worksheet graph. The point on the graph where the
vibration frequency (rpm) reading and the engine rpm reading intersect indicates the specific
component group causing the concern.
„An EVA or equivalent tool capable of measuring vibration frequency and engine rpm will
be needed.
z Provide pictures of diagnostic procedures to aid in testing components.
Combination EngineEAR/ChassisEAR
An electronic listening device used to quickly identify noise and the location under the chassis while
the vehicle is being road tested. The ChassisEARs can identify the noise and location of
damaged/worn wheel bearings, CV joints, brakes, springs, axle bearings or driveshaft carrier bearings.
EngineEAR Basic Unit
An electronic listening device used to detect even the faintest noises. The EngineEARs can detect the
noise of damaged/worn bearings in generators, water pumps, A/C compressors and power steering
pumps. They are also used to identify noisy lifters, exhaust manifold leaks, chipped gear teeth and for
detecting wind noise. The EngineEAR has a sensing tip, amplifier, and headphones. The directional
sensing tip is used to listen to the various components. Point the sensing tip at the suspect component
and adjust the volume with the amplifier. Placing the tip in direct contact with a component will reveal
structure-borne noise and vibrations, generated by or passing through, the component. Various
volume levels can reveal different sounds.
Ultrasonic Leak Detector
The Ultrasonic Leak Detector is used to detect wind noises caused by leaks and gaps in areas where
there is weather- stripping or other sealing material. It is also used to identify A/C leaks, vacuum leaks Klj . 12 ba
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and evaporative emission noises. The Ultrasonic Leak Detector includes a multi-
directional transmitter
(operating in the ultrasonic range) and a hand- held detector. The transmitter is placed inside the
vehicle. On the outside of the vehicle, the hand- held detector is used to sweep the area of the
suspected leak. As the source of the leak is approached, a beeping sound is produced which
increases in both speed and frequency.
Squeak and Rattle Repair Kit
The squeak and rattle repair kit (Rotunda tool number 164- R4900) contains lubricants and self-
adhesive materials that can be used to eliminate interior and exterior squeaks and rattles. The kit
consists of the following materials:
zPVC (soft foam) tape
z Urethane (hard foam) tape
z Flocked (black fuzzy) tape
z UHMW (frosted) tape
z Squeak and rattle oil tube
z Squeak and rattle grease tube
Tracing Powder
Tracing powder is used to check both the uniformity of contact and the tension of a seal against its
sealing surface. These tests are usually done when a suspected air leak/noise appears to originate
from the seal area or during the alignment and adjustment of a component to a weatherstrip. Tracing
powder can be ordered from Crest Industries as ATR Leak Trace. Carry out the tracing powder test as
follows:
a. Clean the weatherstrip.
b. Spray the tracing powder on the mating surface only. c. Close the door completely. Do not slam the door.
d. Open the door. An imprint is made where the weatherstrip contacted the mating surface seal. Gaps or a faint imprint will show where there is poor contact with the weatherstrip. Klj . 13 ba
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DIAGNOSIS AND TESTING
Noise, Vibration and Harshness (NVH)
To assist the service advisor and the technician, a Write-
up Job Aid and an NVH Diagnostic Guide are
included with this material. The Write- up Job Aid serves as a place to record all important symptom
information. The NVH Diagnostic Guide serves as a place to record information reported on the Write-
up Job Aid as well as data from the testing to be carried out.
To begin a successful diagnosis, fill out the NVH Diagnostic Guide, record the reported findings, then
proceed to each of the numbered process steps to complete the diagnosis. SECTION 100-
04: Noise, Vibration and Harshness 2003 Mustang Workshop Manual Special Tool(s)
ChassisEAR
107-
R2102 or equivalent Electronic Vibration Analyzer
100-
F027 (014- 00344) or
equivalent EngineEAR
107-
R2100 or equivalent Ultrasonic Leak Detector
134-
R0135 or equivalent Klj . 1 ba
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Customer Interview
The diagnostic process starts with the customer interview. The service advisor must obtain as much
information as possible about the problem and take a test drive with the customer. There are many
ways a customer will describe NVH concerns and this will help minimize confusion arising from
descriptive language differences. It is important that the concern is correctly interpreted and the
customer descriptions are recorded. During the interview, ask the following questions:
zWhen was it first noticed?
z Did it appear suddenly or gradually? Klj . 4 ba
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