1993 Pontiac Grand Am

I have a 93 pontiac grand am 2.3eng quad 4 dohc when the radiator fan truns on the check eng light comes on checked code and got code 15 I changed the thermostat and temperature senser and change the ecm but it didnot work the same thing happens check wire from temp senser no luck not it please help thanks
March 1, 2006.

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