Vibration Diagnosis and Correction | Diagnostic Information and Procedures | Document ID: 6181701
Special Tools
CH-51450-NVH Oscilloscope Diagnostic Kit (w/NVH)
EL-38792-A Electronic Vibration Analyzer (EVA) 2
For equivalent regional tools. Special Tools and Equipment
|
Step |
Action |
Yes |
No |
|
|
1 |
Has the Vibration Analysis – Road Testing table been completed? |
Go to Step 2 |
Go to Vibration Analysis - Road Testing |
|
|
2 |
Did you duplicate a vibration concern that occurs only during heavy acceleration at launch? |
Go to Step 3 |
Go to Step 4 |
|
|
3 |
Is the vehicle equipped with a solid drive axle and at least 1 universal joint in the propeller shaft system? |
Go to Step 19 |
Go to Step 4 |
|
|
4 |
Did you record frequency data from the CH- 51450-NVH Oscilloscope Diagnostic Kit (w/NVH)or the EL-38792-A Electronic Vibration Analyzer (EVA) 2, during the Vibration Analysis – Road Testing procedure? |
Go to Step 5 |
Go to Step 10 |
|
|
5 |
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? |
Go to Step 6 |
Go to Step 8 |
|
|
6 |
Is the vehicle equipped with a rear mounted transaxle assembly? |
Go to Step 7 |
Go to Step 11 |
|
|
7 |
Inspect the drive axle for proper operation. Refer to the Drive Axle diagnosis information. Did you find and correct a condition? |
Go to Step 24 |
Go to Step 2 |
|
|
8 |
Based on the Vibration Analysis – Road Testing table, is the concern second order driveline related? |
Go to Step 9 |
Go to Step 10 |
|
|
9 |
Does the vehicle driveline contain any universal joints? |
Go to Step 19 |
Go to Vibration Diagnostic Aids |
|
|
10 |
Based on the Vibration Analysis – Road Testing |
Go to Vibration |
Go to Vibration |
|
|
Step |
Action |
Yes |
No |
|
|
11 |
1. Inspect the following components for wear and/or damage: Inspect the propeller shafts for dents, damage, missing weights, and/or undercoating. Inspect the universal joint, or joints, if equipped, for excessive wear, looseness, and/or damage. Inspect the propeller shaft constant velocity (CV) joint, or joints, if equipped, for excessive wear, looseness, and/or damage. Inspect the propeller shaft coupler assembly, or assemblies, if equipped, for excessive wear, looseness, and/or damage. Inspect the propeller shaft support bearing, if equipped, for damaged rubber components, worn bearings, looseness, and/or a deformed or cracked bracket. Inspect the drive axle mounts, if equipped, for excessive wear, looseness, and/or damage. 2. Replace any of the components found to be worn or damaged. Did you find and correct a condition? |
Go to Step 24 |
Go to Step 12 |
|
|
12 |
Is the vehicle 4WD system? |
Go to Step 13 |
Go to Vibration Diagnostic Aids |
|
|
13 |
Was the vibration most evident under the transmission or the transfer case, if equipped? |
Go to Step 14 |
Go to Step 16 |
|
|
14 |
1. If the driveline joint at the transmission or transfer case is a universal joint, measure the propeller shaft runout at the end closest to the transmission or transfer case. Propeller Shaft Runout Measurement 2. Replace components as necessary. Did you find and correct a condition? |
Go to Step 16 |
Go to Step 15 |
|
|
15 |
1. Inspect the powertrain mounts for the following: Loose and/or missing fasteners |
Go to Step 24 |
Go to Step 16 |
|
|
Step |
Action |
Yes |
No |
|
|
|
Improper alignment Cracked, dry-rotted, and/or oil-soaked insulators Twisted, broken, torn, and/or collapsed insulators Bent, twisted, and/or deformed brackets 2. Replace the powertrain mounts as necessary. Did you find and correct a condition? |
|
|
|
|
16 |
1. Inspect the propeller shaft universal joint, or joints, if equipped, for excessive wear, looseness, and/or damage. 2. Inspect the propeller shaft CV joint, or joints, if equipped, for excessive wear, looseness, and/or damage. 3. Inspect the propeller shaft support bearing assembly, if equipped, for damaged rubber components, worn bearings, and/or a deformed or cracked bracket. 4. If the driveline joint at the drive axle is a universal joint, measure the runout of the complete propeller shaft, or shafts. Propeller Shaft Runout Measurement 5. Replace components as necessary. Did you find and correct a condition? |
Go to Step 24 |
Go to Step 17 |
|
|
17 |
1. Measure the runout of the drive axle pinion input flange or shaft: If the driveline joint at the drive axle is a universal joint and if the universal joint yoke IS a bolt-on type, refer to Differential Pinion Input Shaft Runout Measurement. If the driveline incorporates a torque tube attached to the drive axle, refer to Differential Pinion Input Shaft Runout Measurement. If the driveline joint at the drive axle is a coupler assembly or a CV joint, refer to Differential Pinion Input Shaft Runout Measurement. 2. For a direct-mount drive axle, inspect the mounts and/or bushings for excessive wear, looseness, and/or damage. 3. Replace excessively worn or damaged components as necessary. Did you find and correct a condition? |
Go to Step 24 |
Go to Step 18 |
|
|
Step |
Action |
Yes |
No |
|
|
18 |
Return the propeller shaft to it’s original position and balance the propeller shaft. Driveline System Balance Adjustment Were you able to balance the driveline system? |
Go to Step 24 |
Go to Vibration Diagnostic Aids |
|
|
19 |
1. Inspect the following components for wear and/or damage: Inspect the propeller shafts for dents, damage, missing weights, and/or undercoating. Inspect the universal joint, or joints for excessive wear, looseness, and/or damage. Inspect the propeller shaft support bearing, if equipped, for damaged rubber components, worn bearings, looseness, and/or a deformed or cracked bracket. 2. Replace components as necessary. Did you find and correct a condition? |
Go to Step 24 |
Go to Step 20 |
|
|
20 |
Is the drive axle a direct-mount? |
Go to Step 22 |
Go to Step 21 |
|
|
21 |
1. Measure the vehicle trim height. 2. Adjust the vehicle trim height if necessary. Trim Height Inspection Did you find and correct a condition? |
Go to Step 24 |
Go to Step 22 |
|
|
22 |
1. Measure the propeller shaft angles. Driveline Working Angles Measurement 2. If necessary, adjust the propeller shaft angles. Driveline Working Angles Adjustment Did you find and correct a condition? |
Go to Step 24 |
Go to Step 23 |
|
|
23 |
1. Inspect the propeller shafts for proper phasing. Propeller Shaft Phasing Inspection 2. If necessary, correct the propeller shaft phasing. Propeller Shaft Phasing Correction Did you find and correct a condition? |
Go to Step 24 |
Go to Vibration Diagnostic Aids |
|
|
24 |
1. Install or connect any components that were removed or disconnected during diagnosis. 2. Perform the Vibration Analysis - Road Testing. |
Go to Step 5 |
System OK |
|
| Step |
Action |
Yes |
No |
|
Is the vibration still present? |
|
|