Wanted to get confirmation on something…

Pin D12 controls the secondary cooling fan? The schematic I have shows that the secondary cooing fan relay is switched by a stand-alone coolant temperature temperature switch and/or a secondary cooling fan request pin on the ECM- pin D12. My Painless harness isn't populated at D12 so I was going to add it in.

What I'm going to be doing is adding a two-speed Ford Taurus fan and I wanted ECM control of both speeds. The $8D code has on/off temps for a second fan and my schematic (from gmecm) has it shown as a valid I/O on the ECM.

Can anyone please confirm this?

Hmmm... there may be a misprint on the gmecm schematic.


I just looked at my ECM harness and D12 is pre-populated with ground wire (black w/ white stripe)

I also got hold of a Haynes manual and it shows D2 as the secondary fan I/O. I guess I'll just have to put a temperature in the calibration and then hook up a test light to the terminal to see if that pin turns the light on.

Didn't work. So it looks like both D2 and D12 are not correct. Anyone have any ideas??

Nevermind. I think I just found my answer on a search.

7730 pin-out

W/T1500

Awesome! Thanks.

Trying to find info for the 165 and 6E to go
both fans controlled by ECM

Any help??

Thanks

I think I saw something on the $6E in my search. I was more interested in the $8D, so I didn't really read it carefully. But I do remember the $6E being brought up

I searched on "secondary fan" and a bunch of good stuff came up. Give it a shot!

Already did, but will give it another shot
Had seen something about a year ago on this board
but was not a priority at the time.

Thanks