2002 GV setting ignition timing

Hi all. :banghead: Does anyone know how to set the base ignition timing of 5 degs on the 2002 GV without using the $4,000. Suzuki Scan Tool. I know how to do it on my old 97 by jumpering/shorting out 2 terminals of the Data Link Connector. I suspect something similar on the 2002. But can't find anyone who has done it or knows.:naughty: