Scan Tool Diagnostics
WARNING: This page is about a different car, the 2001 Oldsmobile Bravada, 2001 GMC Sonoma, 2001 GMC Jimmy, 2001 Chevrolet S10 Pickup, and 2001 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool (Tech 2) reads and clears current and history codes. Ensure scan tool contains correct software cartridge for SIR diagnostics. To use scan tool, connect it to Data Link Connector (DLC), plug in power source and turn ignition switch to ON position. Follow scan tool manufacturer instructions for communication with SIR system. Scan tool reads serial data from SDM data link output terminal A4 at DLC terminal No. 2.