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3. Determine if the customer's vibration concern is truly
an abnormal condition or something that is
potentially an operating characteristic of the vehicle.
4. Systematically eliminate or "rule-out" possible
vehicle systems.
5. Focus diagnostic efforts on the remaining vehicle
system and systematically eliminate or "rule-out"
possible components of that system.
6. Make a repair on the remaining component, or
components, which have not been eliminated
systematically, and must therefore be the cause of
the vibration.
7. Verify that the customer's concern has been
eliminated or at least brought to an acceptable level.
8. 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".
Diagnostic System Check - Vehicle
Diagnostic Information
1. Verify that none of the following preliminary
inspections/tests reveal the cause of the vehicle
concern before beginning diagnosis:
– Ensure that the battery is fully charged. Refer to
"Battery Inspection/Test: ".
– Ensure that the battery cables are clean and tight.
– Inspect for any open fuses. Refer to "Power
Distribution Schematics: " and "Electrical Center
Identification Views: ".
– Ensure that the grounds are clean, tight, and in
the correct location. Refer to "Ground Distribution
Schematics: " and "Power and Grounding
Component Views: ".
– Inspect the easily accessible systems or the
visible system components for obvious damage or
conditions that could cause the concern. This
would include checking to ensure that all
connections/connectors are fully seated and
secured.
– Inspect for aftermarket devices that could affect
the operation of the system. Refer to "Checking
Aftermarket Accessories: ".
– Search for applicable service bulletins.
➢ If the preceding inspections/tests resolve the
concern, go to"Diagnostic Repair Verification -
Vehicle Diagnostic Information".
2. Install a scan tool. Verify that the scan tool powers
up.
➢ If the scan tool does not power up, refer to "Scan
Tool Does Not Power Up: ".
3. Ignition ON, Engine OFF, verify communication with
all of the control modules on the vehicle. Refer to
"Data Link References: " for information on the
modules you should expect to communicate.
➢ If the scan tool does not communicate with one or
more of the expected control modules, refer to
"Data Link References: ".
General Information:
0A-56
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Table of Contents
Troubleshooting
