For 1990-2009 cars

Begin the system diagnosis with Powertrain On Board Diagnostic (OBD) System Check . The Powertrain On-Board Diagnostic (OBD) 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 serial data circuit.

• | The identification of any stored diagnostic trouble codes (DTCs) and the status of the codes.

The use of the Powertrain On-Board Diagnostic (OBD) System Check will identify the correct procedure for diagnosing the system and where the procedure is located.