Scan Tool Testing and Procedures

A scan tool can read serial data from terminal 9 of the Data Link Connector (DLC). A specific replaceable cartridge must be attached to the scan tool before the scan tool can communicate with the sensing and diagnostic module (SDM) for the purpose of diagnostics. The scan tool is used to read diagnostic trouble codes, and to clear some diagnostic trouble codes after a repair is completed. By design, certain codes cannot be cleared. To use the scan tool, turn the ignition OFF, connect the scan tool to the DLC, and turn the ignition switch to ON. Follow the instructions in the scan tool manual. The SDM sends serial data from terminal A4 of the SDM to terminal 9 of the DLC.