I had a similar issue with my 4ws, fixed it for 20 bucks, when Honda quoted 4000! A large majority of cases whereby the light comes for 4ws on is due to aging of solderings in the ECU`s.
Problem is that Honda only put there circut boards through a thin wash of solder, the solder only lasts for a few years before it starts to dry and crack. I removed my 4ws computer, and took it to a local auto electrics centre for resoldering of these `dry` joints.
http://www.preludeaustralia.com/foru...howtopic=12748
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