Passport LX 2WD V6-3.2L DOHC (6VD1) (1998)
The Honda Computer Memory Saver is indeed a real time saver, but here's a word of caution: Don't let the positive battery cable touch any body ground.
It will cause a short that will either blow the fuse in the tool or cause a drop in system voltage resulting in the loss of any data that 5 in volatile memory.
The Honda Computer Memory Saver is available through the Honda Tool and Equipment Program. To order one, just call and ask for FZRMS4000H.