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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Mechanical - 4.4L - Introduction) >> Diagnostic Information and Procedures >> Drive Belt Falls Off and Excessive Wear Diagnosis >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This inspection is to verify the condition of the drive belt. Damage may have occurred to the drive belt when the drive belt fell off. The drive belt may be damaged, which caused the drive belt to fall off. Inspect the belt for cuts, tears, sections of ribs missing, or damaged belt plys.
  2. 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 being 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 repair procedure of that pulley.
  3. 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.
  4. 6:  Accessory drive component brackets that are bent or cracked may allow the drive belt to fall off.
  5. 7:  Inspecting of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed. Missing, loose, or an incorrect fastener may cause pulley misalignment from the bracket moving under load. Over tightening of the fasteners may cause misalignment of the accessory component bracket.
  6. 13:  The inspection is to verify the drive belt is correctly installed on all of the drive belt pulleys. Wear on the drive belt may be caused by mis-positioning the drive belt by one groove on a pulley.
  7. 14:  The installation of a drive belt that is two wide or two narrow will cause wear on the drive belt. The drive belt ribs should match all of the grooves on all of the pulleys.
  8. 15:  This inspection is to verify the drive belt is not contacting any component of the engine or body while the engine is operating. There should be sufficient clearance when the drive belt accessory drive components load varies. The drive belt should not come in contact with an engine or a body component when snapping the throttle.
Drive Belt Falls Off and Excessive Wear Diagnosis

Step Action Yes No
NOTE: Refer to Belt Dressing Notice .
DEFINITION: The drive belt falls off the pulleys or may not sit correctly on the pulleys.DEFINITION: Wear at the outside ribs of the drive belt may be due to an incorrectly installed drive belt.
1 Did you review the Symptoms-Engine mechanical operation and perform the necessary inspections? Go to Step 2  Go to Symptoms - Engine Mechanical .
2  If diagnosing excessive wear, proceed to step 13.
If diagnosing a drive belt that falls off, inspect for a damaged drive belt.
Did you find the condition?		 Go to Step 3  Go to Step 4 
3 Install a new drive belt. Refer to Supercharger Belt Replacement , Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement , or Generator Drive Belt Replacement .
Does the drive belt continue to fall off?		 Go to Step 4  System OK
4  Inspect for pulley misalignment.
Did you find and repair the condition?		 Go to Step 12  Go to Step 5 
5  Inspect for a bent or dented pulley.
Did you find and repair the condition?		 Go to Step 12  Go to Step 6 
6  Inspect for a bent or a cracked accessory bracket.
Did you find and repair the condition?		 Go to Step 12  Go to Step 7 
7  Inspect for improper, loose or missing fasteners.
Did you find loose or missing fasteners?		 Go to Step 8  Go to Step 9 
8
    NOTE: Refer to Fastener Notice .
  1. Tighten any loose fasteners. Refer to Fastener Tightening Specifications .
  2. Replace any improper or missing fasteners.
Does the drive belt continue to fall off?		 Go to Step 9  System OK
9 Inspect the drive belt tensioner for proper operation. Refer to Drive Belt Tensioner Diagnosis .
Does the drive belt tensioner operate properly?		 Go to Step 11  Go to Step 10 
10 Replace the drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Generator , Drive Belt Tensioner Replacement - Air Conditioning, Power Steering, and Water Pump , or Drive Belt Tensioner Replacement - Supercharger .
Does the drive belt continue to fall off?		 Go to Step 11  System OK
11 Inspect for failed drive belt idler and/or drive belt tensioner pulley bearings.
Did you find and repair the condition?		 Go to Step 12  Go to Diagnostic Aids
12 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
13  Inspect the drive belt for the proper installation. Refer to Supercharger Belt Replacement , Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement , or Generator Drive Belt Replacement .
Did you find this condition?		 Go to Step 16  Go to Step 14 
14  Inspect for the proper drive belt.
Did you find this condition?		 Go to Step 16  Go to Step 15 
15  Inspect the drive belt for contact against a bracket, hose, or wiring harness.
Did you find and repair the condition?		 Go to Step 17  Go to Diagnostic Aids
16 Replace the drive belt. Refer to Supercharger Belt Replacement , Water Pump and Air Conditioning Compressor and Power Steering Pump Belt Replacement , or Generator Drive Belt Replacement .
Did you complete the replacement?		 Go to Step 17  -
17 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK -
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