Uplander AWD V6-3.5L VIN 8 (2005)
Drive Belt Vibration Diagnosis
Diagnostic Aids
The accessory drive components can have an affect on engine vibration. Such as, but not limited to, the A/C system over charged, or an extra load on
the generator. To help identify an intermittent or an improper condition, vary the loads on the accessory drive components.
Test Description
These numbers refer to the step numbers on the diagnostic table.
2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom such as the exhaust
system, or the drivetrain.
3. This test is to verify that the drive belts or accessory drive components may be causing the vibration. When removing the drive belt, the water
pump may not be operating and the engine may overheat. Also DTCs may set when the engine is operating with the drive belt removed.
4. The drive belts may cause a vibration. While the drive belts are removed, this is the best time to inspect the condition of the belt.
6. Inspecting of the fasteners can eliminate the possibility that a wrong bolt, nut, spacer, or washer was installed.
8. This step should only be performed if the fan is driven by the drive belt. Inspect the engine cooling fan for bent, twisted, loose, or cracked blades.
