Diagnostic Starting Point

Begin the system diagnosis with Diagnostic System Check - SIR. The Diagnostic System Check - SIR will provide the following information:
^ The identification of the control module(s) which commands the system
^ The ability of the control module(s) to communicate through the serial data circuit
^ The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check - SIR will identify the correct procedure for diagnosing the system and where the procedure is located. Diagnostic System Check