Envoy 2WD V8-5.3L (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:
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The identification of the control modules which are not communicating.
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The identification of any stored diagnostic trouble codes (DTCs) and their status.
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.
