S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Drive Belt: Testing and Inspection
Drive Belt Falls Off
Drive Belt Falls Off Diagnosis
Diagnostic Aids
If the drive belt(s) repeatedly falls off the drive belt pulleys, this is because of pulley misalignment.
An extra load that is quickly applied on released by an accessory drive component may cause the drive belt to fall off the pulleys. Verify the accessory
drive components operate properly.
If the drive belt(s) is the incorrect length, the drive belt tensioner may not keep the proper tension on the drive belt.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. This inspection is to verify the condition of the drive belt. Damage may of occurred to the drive belt when the drive belt fell off. The drive belt
may of been damaged, which caused the drive belt to fall off. Inspect the belt for cuts, tears, sections of ribs missing, or damaged belt plys.
4. Misalignment of the pulleys may be caused from improper mounting of the accessory drive component, incorrect installation of the accessory drive
component pulley, or the pulley bent inward or outward from a previous repair. Test for a misalign pulley using a straight edge in the pulley
grooves across two or three pulleys.
If a misalign pulley is found refer to that accessory drive component for the proper installation procedure of that pulley.
5. Inspecting the pulleys for being bent should include inspecting for a dent or other damage to the pulleys that would prevent the drive belt from not
seating properly in all of the pulley grooves or on the smooth surface of a pulley when the back side of the belt is used to drive the pulley.
6. Accessory drive component brackets that are bent or cracked will let the drive belt fall off.
7. Inspecting of the fasteners can eliminate the possibility that a wrong bolt, nut, spacer, or washer was installed. Missing. loose, or the wrong
fasteners may cause pulley misalignment from the bracket moving under load. Over tightening of the fasteners may cause misalignment of the
accessory component bracket.
