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Hard one to assist on a remote basis and regret difficult to research properly using wiring diagrams and the manual but :-
Checking in the area of the water temperature sensor would be a good bet as this appears to have several duties. Check wiring connections and the actual unit. Do you have any, cold verses hot engine, drivng symptoms ?
Not likely to be the problem but you should check out the TPS so as to be able to rule this out of the equation. Go to the how to locker where there is instructions re setting and cleaning. This is not a big job and worth doing in any event.
Good luck with this rather curly one.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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