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trouble code p1660 control fan circuit


joshpb

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I have a 1999 cadillac deville with a trouble code p1660. Control fan circuit. I changed the temp sensor. Relays are good. Fuses are good. The fans will not kick on by themselves. I have a bypass to have them on. But it doesnt fix the code and i need to smog. Without the bypass. Both fans do not turn on. With ac on the passenger side does. Anyways to fix this? 

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Pulling the coolant temp sensor connector turns both fans on by default. I do believe you have a broken wire at the harness where the relays are located maybe an orange wire. 

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