Test Description
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The number(s) below refer to the step number(s) 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 belt(s) 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 belt(s) may cause a vibration. While the drive belt(s) is 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 water pump is driven by the drive belt. Inspect the water pump shaft for being bent. Also inspect the water pump bearings for smoothness and excessive play. Compare the water pump with a known good water pump.
- 9: Accessory drive component brackets that are bent, cracked, or loose may put extra strain on that accessory component causing it to vibrate.
Drive Belt Vibration Diagnosis
| Step | Action | Yes | No |
|---|---|---|---|
|
NOTE:
Refer to Belt Dressing Notice in Cautions and Notices. DEFINITION: The following items are indications of drive belt vibration:
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| 1 | Did you review the Symptoms - Engine Mechanical operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Engine Mechanical |
| 2 | Verify that the vibration is engine related. Does the engine make the vibration? |
Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
Go to Diagnostic Starting Point - Vibration Diagnosis and Correction in Vibration and Diagnosis | Go to Step 4 |
| 4 | Inspect the drive belt for wear, damage, debris build-up and missing drive belt ribs. Did you find any of these conditions? |
Go to Step 5 | Go to Step 6 |
| 5 | Install a new drive belt. Refer to Drive Belt Replacement . Did you complete the replacement? |
Go to Step 10 | - |
| 6 | Inspect for improper, loose or missing fasteners. Did you find any of these conditions? |
Go to Step 7 | Go to Step 8 |
| 7 | Tighten any loose fasteners. Replace improper or missing fasteners. Refer to Fastener Tightening Specifications . Did you complete the repair? |
Go to Step 10 | - |
| 8 | Inspect for a bent water pump shaft, if the water pump is belt driven. Refer to Water Pump Replacement (LA1)
or Water Pump Replacement (LY7)
in Engine Cooling. Did you find and correct the condition? |
Go to Step 10 | Go to Step 9 |
| 9 | Inspect for bent or cracked brackets. Did you find and correct the condition? |
Go to Step 10 | Go to Diagnostic Aids |
| 10 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |