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Old 01-12-2019, 09:59 PM
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upallnight upallnight is offline
Join Date: Aug 2012
Location: Cook County
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Originally Posted by andrewwynn View Post
Electric fan is just backup in case vehicle speed and clutch fan isn't enough to do the job. It's programed to come on when core temp gets hot than normal operating temp. I think the fan turns like 1/4 revolution when the key is turned to on to test it.
Actually, the fan spin up and then power is removed from the fan when a DC motor freewheel, it becomes a generator and the electrical voltage is sent to the DME. The DME uses the electrical signal to verify that the fan is good. No electrical signal would mean a bad fan to the DME and the DME will log a trouble code for the fan.
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