Diagnostic Starting Point

Begin the system diagnosis with Diagnostic System Check - Engine Control Systems. The Diagnostic System Check - Engine Control Systems 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 Control Systems will identify the correct procedure for diagnosing the system and where the procedure is located.