Diagnostic Aids
The drive belt will not cause the whine.
If the whine is intermittent, verify that it is not the accessory drive component(s) by varying their loads, making sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or the failing generator are suggested items to inspect.
Test Description
The number(s) below refer to the step(s) on the diagnostic table.
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This test is to verify that the whine is being caused by the accessory drive component(s). Remove the drive belt and operate the engine for a few seconds, this will verify if the whining noise is related to the accessory drive component. With the drive belt removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes (DTCs) may set when the engine is operated with the drive belt removed.
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This 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 removal 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 | Did you review the Symptoms - Engine Mechanical diagnostic information, and perform the necessary inspections? | Go to Step 2 | |
2 | Verify that there is a whining noise. Does the engine make the whining noise? | Go to Step 3 | Go to Diagnostic Aids |
Does the whining noise still exist? | Go to Engine Noise on Start-Up, but Only Lasting a Few Seconds | Go to Step 4 | |
Did you find and correct the condition? | Go to Step 5 | -- | |
5 |
does the whining still exist? | -- | System OK |
