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I wouldn't be too hasty blaming Haynes for incorrect wiring colours as Renault have a habit of forever changing their cable colours.
Have you tried testing the coolant sensor itself using a multi-meter??
During assembly most cars have strategically placed earthing points to minmise the length of cabling required in the wiring looms. These earthing point sare usally shared between various circuits.
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Honda Civic 1.4l