For 1990-2009 cars only
Begin the system diagnosis with the diagnostic system check. Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check 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 Class 2 serial data circuit |
| • | The identification of any stored diagnostic trouble codes (DTCs) and their status |
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
