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If the ECU is reporting issue with the CLT, replace it. Make sure the connections are clean and just replace it. Pick up a new thermostat and radiator cap while you're at it. Will set you back less than US$30 at Autozone.
Typically, when the CLT fails, it adivses the ECU that the coolant (and therefore the engine) is something like -200*F. This throws the ECU into something of a perpetual warm-up mode. Fuel trims are calibrated for extremely cold weather. This might explain why the car wants to start up once it's cooled down, but will not when warmed up.
Be sure you've got the coolant levels topped off and a good sealing radiator cap. Steam pockets, combined with a bad CLT sensor (which is the larger of the two, with the multi-pin connector, BTW) have been the cause of numerous problems with these cars, often resulting in countless hours of trouble shooting.
Good luck.
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