PWM cooling fan(s) control using ECM

[JMitch19]

Originally Posted by samckitt

Pretty sure this is one of the connectors, but I think it is the one that goes to the fan, not the fan module itself.

http://www.casperselectronics.com/st...2fb0a1b1b04209

http://www.eficonnection.com/eficonn...spx?ItemId=915

You are correct. I can't find the connector that plugs into the module to save my life. I'm thinking I'll go the terminals plus electrical potting compound route.

http://www.mouser.com/ProductDetail/...7u45w%2fCKk%3d

[snappytravis]

Originally Posted by JMitch19

You are correct. I can't find the connector that plugs into the module to save my life. I'm thinking I'll go the terminals plus electrical potting compound route.

http://www.mouser.com/ProductDetail/...7u45w%2fCKk%3d

lol, I have been looking for the connector the plugs into fan module also, I google the module manufacturer part number and tried everything. I use to work at gm dealer I may just go up there and see if it list anything in the parts breakdown for it. They make a manual switch that looks like may use it, it has on off and low and high wires in between fans and controller.

[Lous69]

My friendly Chevrolet parts guy said he can not get a separate connector for the module.

It's weird. You just know there is a factory somewhere with bins full of those suckers. Probably even a few lying around on the floor to be swept up and thrown away......but where is that factory???

We decided against the electrical potting on mine. The reason is that it would not allow service to any of the spade connectors down the road should one of them ever get loose or overheat. There is also the possibility the the potting could wick into the connectors and reduce the physical connection surface area.

We used spade connectors. Travis positioned my modules out of harms way relative to rain and splash. We may fill the void around the wires by with a closed cell foam material that can easily be removed.

I suppose one could 3D print an outer sleeve that accepts the o-ring and then pot the spade connectors into that sleeve.... I'll try the foam first.

[parsonsj]

I've got a salvage yard scouring the country for the whole harness, but damaged in some way not related to the controller connection. My plan is to integrate the other end of the wires into a GT280 connector, or maybe a Metri-Pack 480.

We'll see if I come up with something.

[JMitch19]

This morning I decided to disassemble the stock L92 connector to see why GM didn't use any cavity plugs. When I removed the bottom TPA(ecm side) you see no evidence of any cavity plugs. Once I removed the top TPA I could see that GM has the cavity plugs molded into the TPA. I also noticed that the GM connector parts numbers are difference from the 73 and 80 pin connectors that are commonly used in the aftermarket.

Here is a pic of the top TPA.



Also, if you use a release agent with your potting compound you can make your own connector. It's not ideal, but it will work if you have no other option. Your module appears to be mounted in a location that won't see much moisture/water anyway, so I don't see you having a problem with the foam method.

[samckitt]

Originally Posted by mikels

E67 controller has 3 fan output drivers - however, when used with PWM fan control, only one of those outputs is utilized. It provides a PWM output at frequency specific to the fan driver controller. I've not measured voltage based on PWM % output to determine what way the voltage goes based on desired output.

Looking at the E67 pinout I see the 3 different fan terrminals:
FAN1 J3-49
FAN2 J1-54
FAN3 J1-41
Which one is used when using the PWM fan control?

[parsonsj]

The A/C pressure sensor is wired in at pins J3-21 (reference ground), J3-37 (reference 5V), and J3-57 (signal).

The PWM control wire is J3-64.

[samckitt]

Originally Posted by parsonsj

The A/C pressure sensor is wired in at pins J3-21 (reference ground), J3-37 (reference 5V), and J3-57 (signal).

The PWM control wire is J3-64.

Ah, pin 64.... J3-64 FANSPD: IMTVPS

[samckitt]

Originally Posted by parsonsj

The A/C pressure sensor is wired in at pins J3-21 (reference ground), J3-37 (reference 5V), and J3-57 (signal).

The PWM control wire is J3-64.

Just did some investigating on an old OEM harness I have & all three of the pins mentioned above have terminals in them. They are colored as follows:

J3-21 - Black
J3-37 - Gray
J3-57 - Red with black stripe.

All three go to the same 3 terminal connector of the AC pressure switch.


Connector: http://www.eficonnection.com/eficonn...spx?ItemId=910

Pressure switch: (wow $60) http://www.eficonnection.com/eficonn...px?ItemId=1080

And J3-64 is solid blue.

[Lous69]

Finally fired up my car with the dual C6 corvette PWM fan modules hooked up to the ECM. Looks like all is well with that set up so far. We've only started it a coupe of times. Car goes to chassis dyno Monday to break it in exactly per GM recommendations.