For 1990-2009 cars

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.