Diagnostic Starting Point

Begin the system diagnosis with DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS . The Diagnostic System Check-Engine Controls will provide the following information:

• The identification of the control modules which command the system
• The ability of the control modules to communicate through the Serial Data circuit
• The identification of any stored diagnostic trouble codes (DTCs) and the codes' statuses

The use of the Diagnostic System Check-Engine Controls will identify the correct procedure for diagnosing the system and where the procedure is located.