Trouble Charts

Fig 1: Identifying Sample Trouble Chart

Courtesy of GENERAL MOTORS CORP.

The tree charts used in the Saturn service manual (except for the SIR service manual) are designed for easy use. When you first look at a tree chart you will notice that there are three distinctively shaped boxes; square, diamond and oval.

1. Square Box
   
   The square shaped box is the instruction box, used to give you instructions required to perform the diagnostic step.
2. Diamond Box
   
   The diamond shaped box is the result box. This box asks you for the status of the test that you just performed according to the square instructional box.
3. Oval Box
   
   The oval shaped box is the action box. This box informs you of the action required to repair the problem or move onto another test step.

This format is used wherever tree charts are found within the service manuals. All other troubleshooting is performed using paragraph steps.