Impala V6-3.9L (2007)
Information Bus: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point - Data Communications
Begin the system diagnosis with Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information:
* The identification of the control modules which are not communicating.
* The identification of any stored diagnostic trouble codes (DTCs) and their status. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic Starting Point - Vehicle
The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before
system DTC or symptom diagnosis.