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  #11  
Old 10-30-2017, 08:51 PM
dhutton dhutton is offline
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Originally Posted by Timmah View Post
This thread is part two of another thread about the same issue last week. They were trying to make the GMPP controls work with it also. The GMPP harness has a fuse relay in the fuse box that feeds the fan and I believe it is positive 12 volts instead of negative. see statement from the GMPP instruction manual,

" A cooling fan is controlled by the ECM. Control is set to turn on a 12 V fan at 97 Deg C (207 Deg F) coolant temperature. The fan control wire is fused/relayed and must be connected directly to your fan. NOTE: If the wire is not connected to a fan it turn on the service engine soon light."

If this is true, I bet the trinary contacts got burnt.

Question to the user of the aftermarket controller, do you have the MIL lamp turn on not being connected to the fan as stated above, or will it let you toggle it off in the software.

Tim
I don’t use the GMPP blue fan power wire and I don’t get a check engine light.

Don
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  #12  
Old 10-30-2017, 08:52 PM
dhutton dhutton is offline
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Join Date: Nov 2006
Location: Mountain Springs, Texas
Posts: 1,857
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Thanked 448 Times in 247 Posts
Default

Quote:
Originally Posted by Timmah View Post
This thread is part two of another thread about the same issue last week. They were trying to make the GMPP controls work with it also. The GMPP harness has a fuse relay in the fuse box that feeds the fan and I believe it is positive 12 volts instead of negative. see statement from the GMPP instruction manual,

" A cooling fan is controlled by the ECM. Control is set to turn on a 12 V fan at 97 Deg C (207 Deg F) coolant temperature. The fan control wire is fused/relayed and must be connected directly to your fan. NOTE: If the wire is not connected to a fan it turn on the service engine soon light."

If this is true, I bet the trinary contacts got burnt.

Question to the user of the aftermarket controller, do you have the MIL lamp turn on not being connected to the fan as stated above, or will it let you toggle it off in the software.

Tim
I don’t use the GMPP blue fan power wire and I don’t get a check engine light. I don’t toggle anything in the software. Why the ECM would be monitoring fan current is a bit of a mystery to me.

Don
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