PWM cooling fan(s) control using ECM

[erick_e]

Originally Posted by andrewb70

What ECU are you using?

Andrew

It's an E38. 2009 Corvette Z06 with E-Force.

[carbuff]

Originally Posted by erick_e

He informed me that there are only three wires going to the fan pos/neg/pwm. The yellow analog/override wire shown in the one schematic isn't actually present on the fan and that I need to use their white pwm wire to tell the fan how fast to run.

Ok, that makes much more sense to me. I was scratching my head as to what that wire was for. It didn't go anywhere else in the schematic.

Given the chart you have, I think there is a good chance that you could just connect the PWM wire of the fan directly to your ecu. It seems from your description and the schematics/datasheet that it may very well work. I can come up with a few reasons why it might not, but without having a setup to try and some tools to measure it, I can't say for sure.

From the graph you posted, there is nothing which indicates what frequency the Spal wants to receive natively. It shouldn't really matter that much, you will be off a little bit if your frequencies aren't exactly matching. But you can adjust your settings to get it to run and it will still cool.

I'd try it.

[samckitt]

Originally Posted by 130fe

Is the PWM fan control Function something that can be turned on with HP tuners?

Hey Chris, your inbox is full.

[samckitt]

I have a few left, anyone want one? $50 shipped.
Thanks,
Scot

[samckitt]

I ordered a different radiator, ordered the C6 fan from Amazon, ordered some little clips/brackets from C&R Racing and went to town. The Monte radiator is a little wider than the Vette radiator, so couldn't weld the brackets to the tanks like C&R racing does. I did on one side & had to use some 1/8" flat stock on the other side. Gotta find the bolts/nuts yet to bolt it on.

Here is what It looks like:

[Ron in SoCal]

^ that looks great Scot!

Props for staying with it and getting it done on this project

[SlowProgress]

That does look really good. I would be chicken to weld on a brand new radiator !

[65C6Corvette]

I am still a little confused from the prior posts. I am using an E67 ECM, vintage air Gen IV with sanden compressor and binary pressure sensor; and understand to use the AC Delco PWM controller.

I am clear on the ECM pin outs:

E67 Pinouts that need to be added are all on the J3 (grey) connector.
AC Pressure Sensor
J3-21 (ground) wire color black
J3-37 (5V) wire color grey
J3-57 (AC pressure signal) wire color red/black
PWM output
J3-49 wire color green

PWM Fan Control Module - AC Delco 15-80803
Pinouts
1) Fan (-)
2) Battery (-)
3) Battery (+) fused
4) Fan (+)
6) PWM output from ECM (J3-49)

AC Pressure Sensor from C6 Corvette
Pinouts
1) ground (connect to J3-21 on ECM - wire color black)
2) 5V (connect to J3-37 on ECM - wire color grey)
3) Pressure signal (connect to J3-57 on ECM - wire color red/black)


My confusing is with the C6 pressure sensor. Here is my question:

To what are you connecting the C6 Vette pressure sensor? Are you still using the the vintage air binary switch with the native wiring, or are you replacing the binary with a trinary and using the additional blue signal wire from the trinary switch as the input to J3-57; or are you keeping the vintage air binary switch and also adding the AC Pressure sensor? If so are you connecting it to the service port on the sander; or are you only using the C6 pressure sensor in place of the binary switch and connecting this to the vintage air harness as well as the ECM?

[samckitt]

I sent mine back. Wires were too short to mount the module, I also noticed the shroud was warped. Would have lived with it, but not not being able to mount the module. Also notice the Connector & terminals are not OEM style.

Originally Posted by andrewb70

So I got the C6 fan today. Not surprising, made in Taiwan, but who cares, iPhones are made in Taiwan too...

The fan assembly doesn't match the picture that is posted on Amazon. I don't know if there was a design change on these at some point, but here is what I got:





The fan blade is 16.5" and it comes with the right connector to plug it into the C6 fan controller. There is even a little molded cradle for it. Imagine that.



Just let me know if anyone wants any other measurements.

Andrew

[andrewb70]

I can't send mine back because I've already cut parts of the shroud. Mine is slightly warped as well and the wires for the connector are too short. I can't mount the controller on the shroud anyway because it interferes with the bottom outlet.

Yours looks perfect on the radiator!

Andrew