Without Scan Tool
TO CLEAR FAULT CODES FROM THE ECU1, Turn the ignition switch OFF.
Back Up Fuse For Clearing Codes:
2. Remove the Back Up fuse Fuse #24, 7.5A from the main (underhood) fuse box.
3. Wait 10 seconds for the ECU to clear it`s memory, and reinstall the Back Up (7.5A) fuse.