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Thread: Weird problem with PCM and EFans

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  1. #1
    Member
    Join Date
    Mar 2006
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    53

    Default Weird problem with PCM and EFans

    has anyone ever seen an issue where the PCM is contantly grounding pin 42 (low fan switch). Everytime I turn the truck on, the fans kick on immediatlely instead of waiting for the Fan on time programmed in my tune. I thought maybe it was a problem with the relays but then i put a volt meter to the wire that is curretnly in 42's slot and it was definitley showing a grounded connection. If anyone has any idea as to why the pcm would basically have the fans on at all times when the vehicle is running please let me know.

    01 chevy silverado ecsb ... not stock by any means

    Heres the tun incase you would like to see if it is the problem but im almost positive that it isn't
    Attached Files Attached Files

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