In the end I gave up, the problem just kept returning no matter what I did, the plug spraying always cured it but only in the sort term, I looked at the options available and settled for the Tomei hicas lock kit, mainly because it is fairly simple with the hicas unit staying there but locked with spacers and a elec unit to fool the main ecu into thinking all is good with it, the other option is a lock bar which replaces the hicas unit.
I never got the diag to work either.