Drive Belt Tensioner Diagnosis

Special Tools 

EN-48488  Holding Wrench

For equivalent regional tools, refer to Special Tools .

1. Diagnosis consists of a function check on the automatic belt tensioner and a visual check on the belt and the components linked to the belt.
2. Install the EN-48488  wrench (2) to the drive belt tensioner pulley bolt (1).
   Fig 1: Drive Belt Tensioner Spring, Drive Belt Tensioner Pulley Bolt And Wrench

   Courtesy of GENERAL MOTORS COMPANY
3. Apply tension to the drive belt tensioner spring (3) by moving the drive belt tensioner pulley clockwise.
4. Allow the drive belt tensioner to slide back slowly and thereby inspect the drive belt tensioner mechanism for practicability.