There are 2 simple ways to reset the ECU.
1) Use a code scanner that has a reset function or 2) disconnect the cables at the battery for 10 minutes or so. Before reconnecting, touch the two together for a few seconds.
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disconnect the battery negative for 20 minutes and re-connect
i have had pretty good success with this same vehicle using pwm/efie/map enhancer/28% naoh soln and 21 plate purchased online electrolyzer. Although i am still experimenting and have not gotten consistant results. i hear this vehicle is a tough one to crack. have managed 25%gains so far.
I get lots of weird results. First reason seems to be poor fuel economy when engine is cold. I usually reset the scan gauge 2 to solve this. Second is I think weather plays a part in fuel economy or HHO operation. Third is we all want to get better millage and by driving better we can save gas. This is very difficult to judge.
I am working on a dry cell and hope to post results in a few weeks. If it works I will post the plans.