DEFINITION: A low pitch tapping noise usually caused by drive belt misalignment. This noise usually occurs on cold start-up at idle. A low frequency noise heard once per revolution of the drive belt.

Inspect for severe pilling.

Is there severe pilling of more than 1/3 of the rib depth?

Go to Step 2

System OK

Clean the drive belt pulleys.

Is the repair complete?

System OK

Go to Step 3

Install a new drive belt. Refer to Drive Belt Replacement .

Is the repair complete?

System OK

--