Diagnostic Aids
The drive belts will not cause the whine.
If the whine is intermittent, verify that it is not the accessory drive components by varying their loads, making sure they are operating to their maximum capacity. An overcharged A/C system, a power steering system restriction or the incorrect fluid, or a failing generator are suggested items to inspect.
Test Description
The numbers below refer to the steps in the diagnostic table.
-
This test is to verify that the whine is being caused by the accessory drive components. Remove the drive belts 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 belts removed the water pump will not operate and the engine may overheat. Also DTCs may set when the engine is operated with the drive belts removed.
-
This inspection should include checking the drive belt tensioner and the drive belt idler pulley bearings. The drive belts 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 installation procedure.
Step | Action | Yes | No |
|---|---|---|---|
|
Notice: Do not use belt dressing on the drive belt. Belt dressing causes the breakdown of the composition of the drive belt. Failure to follow this recommendation will damage the drive belt. 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 |
