Sierra Classic 1500 2WD V8-4.8L (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 System Check - 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.