PWM cooling fan(s) control using ECM

[andrewb70]

Originally Posted by PTAddict

I have an LT4 and the GMPP controller kit, and a late model CTS-V cooling fan, but we're a month or two from finishing wiring and getting things running. I am hoping that I can reprogram the e92 with HPTuners to do PWM control as it does in a CTS-V - we'll see. Why GM would block PWM control in the crate motor ECUs is beyond me ...

Thanks for chiming in! Please keep this thread updated. I know from another LT4 build that the stock GMPP fan configuration is discrete fan control, with a Hi and Low fan setting. PWM would be way better, especially if you're using the new CTSV 800watt fan.

Have you found a source for the Yazaki connector and terminals for the fan?

Andrew

[ProServ]

I haven't seen the CTS-V fan. Does it use the same connectors as the C7 Corvette and the aftermarket released Spal DC brushless fans? If so I have those connectors in stock as kits with terminals seals etc.

Here is what I have:



Multiple terminals and seals are provided to account for different gauge wire applications.

Jason Haines
Product & Service Solutions LLC
[email protected]
www.proservsolutions.com

Originally Posted by andrewb70

Thanks for chiming in! Please keep this thread updated. I know from another LT4 build that the stock GMPP fan configuration is discrete fan control, with a Hi and Low fan setting. PWM would be way better, especially if you're using the new CTSV 800watt fan.

Have you found a source for the Yazaki connector and terminals for the fan?

Andrew

[PTAddict]

Originally Posted by andrewb70

Thanks for chiming in! Please keep this thread updated. I know from another LT4 build that the stock GMPP fan configuration is discrete fan control, with a Hi and Low fan setting. PWM would be way better, especially if you're using the new CTSV 800watt fan.

Have you found a source for the Yazaki connector and terminals for the fan?

Andrew

I got the connector from Summit:

https://www.summitracing.com/parts/SPU-IXSBLYAZPT

Edit: the above part number is complete connector, terminals, and harness.

The GMPP controller is indeed set up for discrete control as it comes, I'm just assuming I can change that like on most GM ECU.

Scott

[andrewb70]

Originally Posted by PTAddict

I got the connector from Summit:

https://www.summitracing.com/parts/SPU-IXSBLYAZPT

Edit: the above part number is complete connector, terminals, and harness.

The GMPP controller is indeed set up for discrete control as it comes, I'm just assuming I can change that like on most GM ECU.

Scott

Scott,

Thanks for the info!!!

I am eager to see if you can change the tune in the e92 for PWM fan control.

Andrew

[blake-b]

Has the E38 been figured out for PWM fan control?

I have a 2010 Camaro and a radiator coming with twin Spal brushless fans. I called Spal and they wouldn't tell me anything because of an NDA with GM as they are an OEM supplier. I called the place building the radiator and was told the same thing but they'd see what, if anything, they could find out because they have not installed in a 2010 Camaro.

Dave Steck (DSX Tuning) is a friend of mine and I contacted him about it. He said the Corvette and Camaro E38 OS are the same but have differing CANbus communication. He said he sees no reason I can't control the fans with PWM because the OS has PWM Electric as a choice. That is a screenshot of my actual tune showing it.

Unless I missed something in this thread (quite possible) I haven't seen anyone successfully running PWM in a 5th Gen Camaro and an E38 ECM.

It would be nice to be able to just drop the new fans in, connect the wires and go.

ETA: I don't know which fans I'm getting as the place (wizard cooling) is going to use the biggest ones that will fit. 14" diameter and 3. 25" thickness was mentioned. I am not aware of any other aftermarket 5th Gen radiator having 14" fans though.

[vannatta20]

A 5th gen camaro e38 os will not support pwm. But a truck e38 os will. Also the e92 silverado controller will only support pwm at 100hertz. No discrete on the new stuff factory os.. The gmpp e92 controller will support discrete only. Its all super confusing and testing is the only way to know for sure. Lot of misinformation out there. I use an oscilloscope at work to see the signals. To get ac control the computer needs to get a serial on request from the bcm. We have a module the sends that signal along with tap shift commands for gen iv and gen v. This control the fan based on ac pressure as well. Works perfectly.

[blake-b]

Originally Posted by vannatta20

A 5th gen camaro e38 os will not support pwm. But a truck e38 os will. Also the e92 silverado controller will only support pwm at 100hertz. No discrete on the new stuff factory os.. The gmpp e92 controller will support discrete only. Its all super confusing and testing is the only way to know for sure. Lot of misinformation out there. I use an oscilloscope at work to see the signals. To get ac control the computer needs to get a serial on request from the bcm. We have a module the sends that signal along with tap shift commands for gen iv and gen v. This control the fan based on ac pressure as well. Works perfectly.

Thanks for the reply. I figured out the camaro OS won't do it. However, the Spal fans come with their own PWM controller built in so it was a non issue. They come on around 165* and by 185* are full speed.

[dhutton]

Originally Posted by blake-b

Thanks for the reply. I figured out the camaro OS won't do it. However, the Spal fans come with their own PWM controller built in so it was a non issue. They come on around 165* and by 185* are full speed.

Spal fans with built in PWM controller? Could you post a part number and/or some details?

Thanks,
Don

[longhornss]

Originally Posted by vannatta20

A 5th gen camaro e38 os will not support pwm. But a truck e38 os will. Also the e92 silverado controller will only support pwm at 100hertz. No discrete on the new stuff factory os.. The gmpp e92 controller will support discrete only. Its all super confusing and testing is the only way to know for sure. Lot of misinformation out there. I use an oscilloscope at work to see the signals. To get ac control the computer needs to get a serial on request from the bcm. We have a module the sends that signal along with tap shift commands for gen iv and gen v. This control the fan based on ac pressure as well. Works perfectly.

So I would like to run 2 spal brushless fans on my C10 build running an E92. I currently have A GMPP kit.
So with all this, it looks like need to track down a Silverado ECM and transfer the program from my GMPP controller?

[LSTOYS]

Has anyone gotten one of the 2017 CTS-V / Camaro fans to work? I bought one and I'm trying to to get it to work with my 2010 Colorado E67. I changed the fan settings to PWM EV, and 100 hz, but I can't get it to do anything. Does anyone have any details on getting this fan to work. It should be a sweet fan if I can get it working.