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Hello, P1491 indicates there is a problem in the cooling fan relay circuit. To check it you'll need a volt meter and to follow the steps below. LEt me know if I can help further.
Tests and wiring diagram at links below
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You'll need a volt meter that reads volts and ohms, something like this. Once you get the meter let me know and I can walk you through checking everything.
Unfortunately I will be away tomorrow. I'm going to open this back up and another expert will come on to assist you. I apologize for any wait you may experience.
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