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There is a fan solenoid that operates the fan. It is powered from the fuse panel under the hood, but grounded out the ECM. If the ECM is showing you are commanding operation for the ground, then there is an issue either with the fuse or with the solenoid itself. I would check the solenoid, mounted on the firewall, to see that it is getting both power and ground then proceed on which side is lost. It is quicker to start there.
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