Diagnostic Aids
The drive belt will not cause the whine noise.
If the whine noise is intermittent, verify the accessory drive components by varying their loads making sure they are operated to their maximum capacity. Such items but not limited to may be an A/C system overcharged or the generator failing.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This test is to verify that the noise is being caused by the drive belt or the accessory drive components. When removing the drive belt the water pump will not be operating and the engine may overheat. Also DTCs may set when the engine is operating with the drive belt removed.
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The inspection should include checking the drive belt tensioner and the drive belt idler pulley bearings. The drive belt may have to be installed and the accessory drive components operated separately by varying their loads. Refer to the suspected accessory drive component for the proper inspection and replacement procedure.
Step | Action | Yes | No |
|---|---|---|---|
|
Notice: Refer to Belt Dressing Notice in the Preface section. DEFINITION: A high pitched continuous noise that may be caused by an accessory drive component failed bearing. | |||
1 | Verify that there is a whine noise. Does the engine make the whine noise? | Go to Step 3 | System OK |
Does the whine noise still exist? | Go to Vibration Analysis - Engine in Vibration Diagnosis and Correction | Go to Step 3 | |
Inspect for a failed accessory drive component bearing. Did you find and repair the condition? | Go to Step 4 | Go to Step 2 | |
4 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
