Buick Encore: Diagnostic information and procedures
SPECIFICATIONS
TIRE AND WHEEL RUNOUT SPECIFICATIONS
Tire and Wheel Runout Specifications
DIAGNOSTIC INFORMATION AND PROCEDURES
VIBRATION DIAGNOSIS, STARTING POINT, AND CORRECTION
The information contained in this Vibration Diagnosis and Correction section
is designed to cover various
vehicle designs and configurations. Not all content will apply to all vehicles.
NOTE: The following steps must be completed before using the
analysis tables or the
symptom tables.
- Perform the Vibration Analysis - Road Testing (EL-38792-A Electronic
Vibration Analyzer),
Vibration Analysis - Road Testing (CH-51450-NVH Oscilloscope) table before
using the other
Vibration Analysis tables or the Symptom tables in order to effectively
diagnose the customer's concern.
The use of Vibration Analysis - Road Testing will first provide duplication
of virtually any vibration
concern and then identify the correct procedure for diagnosing the area of
concern which has been
duplicated.
- Review the following Vibration Diagnostic Process.
- Review the general descriptions to familiarize yourself with vibration
theory and terminology, the CH-
51450-NVH Oscilloscope Diagnostic Kit (w/NVH) , or the EL-38792-A Electronic
Vibration Analyzer
(EVA) 2 , and the EL-38792-VS Vibrate Software. Reviewing this information
will help you determine
whether the condition described by the customer is a potential operating
characteristic or not.
Refer to the following:
- Vibration Theory and Terminology
- Oscilloscope Diagnostic Kit Description and Operation
- Electronic Vibration Analyzer (EVA) Description and Operation
- Vibrate Software Description and Operation
- Reed Tachometer Description
Vibration Diagnostic Process
NOTE: Using the following steps of the vibration diagnostic process
will help you to
effectively narrow-down and pin-point the search for the specific source of a
vibration concern and to arrive at an accurate repair.
- Gather specific information on the customer's vibration concern.
- Perform the road testing steps in sequence as identified in Vibration
Analysis - Road Testing in order to
duplicate the customer's concern and evaluate the symptoms of the concern
under changing conditions.
Observe what the vibration feels like and what it sounds like. Observe when
the symptoms first appear,
when they change, and when they cease.
- Determine if the customer's vibration concern is truly an abnormal
condition or something that is
potentially an operating characteristic of the vehicle.
- Systematically eliminate or "rule-out" possible vehicle systems.
- Focus diagnostic efforts on the remaining vehicle system and
systematically eliminate or "rule-out"
possible components of that system.
- Make a repair on the remaining component, or components, which have not
been eliminated
systematically, and must therefore be the cause of the vibration.
- Verify that the customer's concern has been eliminated or at least
brought to an acceptable level.
- Again perform the road testing steps in sequence as identified in
Vibration Analysis - Road Testing in
order to verify that the vehicle did not have more than one vibration
occurring.
Preliminary Visual/Physical Inspection
- Inspect for aftermarket equipment and modifications which could affect
the operation of the vehicle
rotating component systems.
- Inspect the easily accessible or visible components of the vehicle
rotating component systems for obvious
damage or conditions which could cause the symptom.
- Inspect the tire inflation pressures for the proper pressure.
Diagnostic Aids
Improper component routing or isolation, or components which are worn or
faulty may be the cause of
intermittent conditions that are difficult to duplicate. If the vibration
concern could not be duplicated by
following the steps of the Vibration Diagnostic Process, refer to Vibration
Diagnostic Aids.
READ NEXT:
Test Description
The numbers below refer to the step numbers on the diagnostic table.
5
Obtaining rotational speed for the components rotating at tire/wheel speed is
critical to systematically
elimin
Test Description
The numbers below refer to the step numbers on the diagnostic table:
2
This test will determine the effect of turning input on the vibration.
6
This test will determine the effect of
Special Tools
CH-51450-NVH Oscilloscope Diagnostic Kit (w/NVH)
EL-38792-A Electronic Vibration Analyzer (EVA) 2
EL-38792-25 Inductive Pickup Timing Light
EL-47955 Multi Diagnostic Interface MDI
SEE MORE:
Taillamp Assembly
The vehicle has halogen turn signal
lamps and back-up lamps, LED tail/
stoplamps, and a sidemarker lamp
on the taillamp assembly.
Driver Side
Remove the cover and screws
attaching the panel to the
vehicle interior. Remove the
panel.
Remove the cover.
Passenger Side
R
Your satisfaction and goodwill are
important to your dealer and to
Buick. Normally, any concerns with
the sales transaction or the
operation of the vehicle will be
resolved by your dealer's sales or
service departments. Sometimes,
however, despite the best intentions
of all concerned, misunderstandi