Diagnostic Starting Point - Engine Controls

Begin the system diagnosis with Diagnostic System Check - Engine Controls. The Diagnostic System Check - Engine Controls will provide the following information:

• The identification of control modules which command the system.
• The ability of control modules to communicate through 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. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS .