Sierra 1500 2WD V6-4.3L VIN X (2004)
Steps 14 - 15
The number(s) below refer to the step(s) in the diagnostic table.
2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not
proceed further with his table.
3. The noise may be an internal engine noise. Remove the drive belt and operate the engine for a few seconds, this will verify if the chirping noise is
related to the drive belt or not. 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.
4. Inspect the drive belt for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves caused by the accumulation of rubber
dust.
6. Misalignment of the accessory drive pulley(s) may be caused from improper mounting or incorrect installation of an accessory drive component,
or the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across
two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for
that pulley.
10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed.
12. Inspect the accessory drive pulley(s) should include inspecting for bends, dents or other damage to the pulley(s) that would prevent the drive belt
from seating properly in the pulley grooves, or on the smooth surface of the pulley when the back side of the drive belt is used to drive the pulley.
14. Replacing the drive belt when it is not damaged or there is not excessive pilling will only be a temporary repair.
Drive Belt Excessive Wear
Drive Belt Excessive Wear Diagnosis
Diagnostic Aids
Excessive wear on a drive belt is usually caused by incorrect installation or the incorrect drive belt for the application.
Minor misalignment of the accessory drive belt pulley(s) will not cause excessive wear, but will probably cause the drive belt to make a noise or fall
off.
Excessive misalignment of the accessory drive pulley(s) will cause excessive wear and may also make the drive belt fall off.
Test Description
