Description of On-Board Diagnostics

Diagnostic System Check:

CIRCUIT DESCRIPTION

The Self-Diagnostic System Check is an organized approach for identifying a problem caused by the on-board computer controlled electronics. Understanding this chart and using it correctly will reduce diagnosis time and prevent the unnecessary replacement of parts. If you have not reviewed the basic information on how to use the computer self-diagnostics, go to Vehicle On-Board Diagnostics/General Information.

NOTES ON TROUBLE TREES

1. If diagnostic system is not functional, a problem is present in the Instrument Panel Cluster (IPC) or related wiring.
2. If trouble codes are present they should be diagnosed in the order displayed.