PWM cooling fan(s) control using ECM

[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.

[samckitt]

Hey Lou, you running two fans from one module or two modules, one for each fan? If two modules, you triggering both with one signal wire from the ECM?


And if Lou is running two modules, anyone know if you can run two fans from one module?

[Lous69]

We're running two fans with two modules, both triggered by the same ECU signal. Seems to work fine so far.

I believe our set up is overkill. You should be able to drive two fans with one module as long as you don't exceed the module's rating or the total amperage of the fan in the application the module was originally designed for.

[samckitt]

Anyone ever find a source for the connector for the module itself?

[Syclone892]

I have been following this post and have a question. I have a taurus fan and am getting the holley dominator which I want to make the fan powered by pwm. I was planning on get a solid state relay and send the pwm - signal to it to turn the relay on and off. I haven't checked any diagrams at work but looking at this module I am wondering is it just a nice looking solid state relay? The relay I plan on using is 4 wire so this has one extra wire, I think the extra one is + to fan motor?
Basically I would have
bat + to one side of the coil
pwm - to the other side of the coil
ground to fan motor from relay
ground from battery to relay
and I would have a + wire direct to the fan motor + wire
There would be fuses etc I was just making it quick for example. I like this module if its what I am thinking as its compact and looks more factory than a ssr, it would be nice to find the darn connector for it to finish it off though. So is it possible I could use this to power my taurus fan with my holley ecu?

Thanks to any one that can help out, this site has a lot of great info I have been taking in