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Step
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Action
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Yes
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No
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1
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Has the Vibration Analysis - Road Testing table been completed?
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Go to
Step 2
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Go to
Vibration Analysis - Road Testing
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2
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Did you duplicate a vibration concern that occurs only during heavy acceleration at launch?
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Go to
Step 3
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Go to
Step 4
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3
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Is the vehicle equipped with a solid drive axle and at least 1 U-joint in the propeller shaft system?
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Go to
Step 26
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Go to
Step 4
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4
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Did you record frequency data from the
EL-38792-A
Electronic Vibration Analyzer (EVA) 2 , during the Vibration Analysis - Road Testing procedure?
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Go to
Step 5
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Go to
Step 10
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5
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Based on the Vibration Analysis - Road Testing table, is the concern first order, sixth order, or a slightly higher multiple of first order driveline related?
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Go to
Step 6
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Go to
Step 8
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6
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Is the vehicle equipped with a rear mounted transaxle assembly?
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Go to
Step 7
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Go to
Step 11
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7
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Inspect the drive axle for proper operation. Refer to the Drive Axle diagnosis information.
Did you find and correct a condition?
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Go to
Step 32
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Go to
Step 2
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8
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Based on the Vibration Analysis - Road Testing table, is the concern second order driveline related?
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Go to
Step 9
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Go to
Step 10
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9
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Does the vehicle driveline contain any U-joints?
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Go to
Step 26
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Go to
Vibration Diagnostic Aids
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10
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Based on the Vibration Analysis - Road Testing table, is the concern a noise that is not felt?
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Go to
Vibration Diagnostic Aids
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Go to
Vibration Analysis - Road Testing
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11
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1.
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Inspect the following components for wear and/or damage:
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•
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Inspect the propeller shafts for dents, damage, missing weights, and/or undercoating.
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•
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Inspect the U-joint, or joints, if equipped, for excessive wear, looseness, and/or damage.
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•
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Inspect the prop shaft constant velocity (CV) joint, or joints, if equipped, for excessive wear, looseness, and/or damage.
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•
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Inspect the prop shaft coupler assembly, or assemblies, if equipped, for excessive wear, looseness, and/or damage.
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•
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Inspect the prop shaft support bearing, if equipped, for damaged rubber components, worn bearings, looseness, and/or a deformed or cracked bracket.
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•
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Inspect the drive axle mounts, if equipped, for excessive wear, looseness, and/or damage.
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2.
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Replace any of the components found to be worn or damaged.
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Did you find and correct a condition?
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Go to
Step 32
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Go to
Step 12
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12
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Attempt to duplicate the vibration in the stall. Refer to
Vibration in Service-Stall Test (Non-Torque Sensitive)
.
Were you able to duplicate the vibration?
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Go to
Step 16
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Go to
Step 13
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13
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Perform the
Vibration in Service-Stall Test (Torque Sensitive)
.
Were you able to duplicate the vibration?
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Go to
Step 14
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Go to
Vibration Diagnostic Aids
|
14
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Is the vehicle front wheel drive with an all wheel drive system?
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Go to
Step 15
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Go to
Vibration Diagnostic Aids
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15
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1.
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Remove the propeller shaft.
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Is the vibration still present?
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Go to Transfer Case diagnosis information
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Go to Drive Axle diagnosis information
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16
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Was the vibration most evident under the transmission or the transfer case, if equipped?
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Go to
Step 17
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Go to
Step 20
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17
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1.
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If the driveline joint at the transmission or transfer case is a U-joint, measure the prop shaft runout at the end closest to the transmission or transfer case. Refer to
Propeller Shaft Runout Measurement
.
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3.
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If the driveline joint at the transmission or transfer case is a coupler assembly, inspect the coupler assembly for excessive wear, looseness, missing or broken fasteners, and/or damage. Measure the runout of the transmission or transfer case output flange. Refer to
Transfer Case Output Flange Runout Measurement
.
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4.
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Replace the components as required.
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Did you find and correct a condition?
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Go to
Step 19
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Go to
Step 18
|
18
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1.
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Inspect the powertrain mounts for the following:
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•
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Loose and/or missing fasteners
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•
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Cracked, dry-rotted, and/or oil-soaked insulators
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•
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Twisted, broken, torn, and/or collapsed insulators
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•
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Bent, twisted, and/or deformed brackets
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2.
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Replace the powertrain mounts as necessary.
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Did you find and correct a condition?
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Go to
Step 19
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Go to
Step 20
|
19
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Perform the
Vibration in Service-Stall Test (Torque Sensitive)
.
Is the vibration still present?
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Go to
Step 20
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Go to
Step 32
|
20
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1.
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Inspect the prop shaft U-joint, or joints, if equipped, for excessive wear, looseness, and/or damage.
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2.
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Inspect the prop shaft CV joint, or joints, if equipped, for excessive wear, looseness, and/or damage.
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3.
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Inspect the prop shaft coupler assembly for excessive wear, looseness, broken or missing fasteners, and/or damage.
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4.
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Inspect the prop shaft support bearing assembly, if equipped, for damaged rubber components, worn bearings, and/or a deformed or cracked bracket.
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6.
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If the driveline incorporates a torque tube attached to the drive axle and the joint at the torque tube is a CV joint, coupler assembly, or bolt-on U-joint yoke, measure the runout of the torque tube input flange. Refer to
Torque Tube Input Flange Runout Measurement
.
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7.
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Replace the components as required.
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Did you find and correct a condition?
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Go to
Step 21
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Go to
Step 22
|
21
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Perform the
Vibration in Service-Stall Test (Torque Sensitive)
.
Is the vibration still present?
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Go to
Step 22
|
Go to
Step 32
|
22
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1.
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Measure the runout of the drive axle pinion input flange or shaft:
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2.
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For a direct-mount drive axle, inspect the mounts and/or bushings for excessive wear, looseness, and/or damage.
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3.
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Replace excessively worn or damaged components as necessary.
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Did you find and correct a condition?
|
Go to
Step 23
|
Go to
Step 24
|
23
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Perform the
Vibration in Service-Stall Test (Torque Sensitive)
.
Is the vibration still present?
|
Go to
Step 24
|
Go to
Step 32
|
24
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Re-index the prop shaft. Perform the following steps:
|
1.
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Raise and support the vehicle.
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2.
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Mark the position of the prop shaft to both the transmission or transfer case output shaft flange, and the drive axle input flange.
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3.
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Remove the propeller shaft.
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4.
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Rotate the prop shaft 180 degrees to both of the flanges.
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5.
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Reinstall the prop shaft.
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Was the vibration reduced or eliminated?
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Go to
Step 32
|
Go to
Step 25
|
25
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Return the prop shaft to it's original position and balance the prop shaft. Refer to
Driveline System Balance Adjustment
.
Were you able to balance the driveline system?
|
Go to
Step 32
|
Go to
Vibration Diagnostic Aids
|
26
|
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1.
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Inspect the following components for wear and/or damage:
|
|
|
•
|
Inspect the propeller shafts for dents, damage, missing weights, and/or undercoating.
|
|
|
•
|
Inspect the U-joint, or joints for excessive wear, looseness, and/or damage.
|
|
|
•
|
Inspect the prop shaft support bearing, if equipped, for damaged rubber components, worn bearings, looseness, and/or a deformed or cracked bracket.
|
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2.
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Replace the components as required.
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Did you find and correct a condition?
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Go to
Step 32
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Go to
Step 27
|
27
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Is the drive axle a direct-mount?
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Go to
Step 29
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Go to
Step 28
|
28
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1.
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Measure the vehicle trim height.
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Did you find and correct a condition?
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Go to
Step 32
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Go to
Step 29
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29
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Did you find and correct a condition?
|
Go to
Step 32
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Go to
Step 30
|
30
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Does this prop shaft system have only 1 U-joint?
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Go to
Vibration Diagnostic Aids
|
Go to
Step 31
|
31
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Did you find and correct a condition?
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Go to
Step 32
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Go to
Vibration Diagnostic Aids
|
32
|
|
1.
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Install or connect components that were removed or disconnected during diagnosis.
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Is the vibration still present?
|
Go to
Step 5
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System OK
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