Without Scan Tool
WARNING: This page is about a different car, the 2003 Acura 3.2TL and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
To clear PCM memory without using a scan tool, remove No. 13 CLOCK BACKUP fuse (15-amp on 3.2CL, 7.5-amp on 3.2TL) from under-hood fuse/relay box for 10 seconds.