With Generic Scan Tool

HOW TO ERASE DTC
The diagnostic trouble code can be erased by CONSULT-II, GST or ECM DIAGNOSTIC TEST MODE as described following.
^ If the battery terminal is disconnected, the diagnostic trouble code will be lost within 24 hours.
^ When you erase the DTC, using CONSULT-II or GST is easier and quicker than switching the mode selector on the ECM.

The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC related to OBD-II. For details, refer to Powertrain Management; Computers and Control Systems.
^ Diagnostic trouble codes (DTC)
^ 1st trip diagnostic trouble codes (1st trip DTC)
^ Freeze frame data
^ 1st trip freeze frame data
^ System readiness test (SRT) codes
^ Test values

HOW TO ERASE DTC (WITH GST)
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 5 seconds and then turn it ON (engine stopped) again.
2. Perform "OBD-II SELF-DIAGNOSTIC PROCEDURE (No Tools)". (The engine warm-up step can be skipped when performing the diagnosis only to erase the DTC.)
3. Select Mode 4 with Generic Scan Tool (GST). For details, refer to Powertrain Management; Computers and Control Systems.