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Old 02-09-2013, 08:10 PM
Lous69 Lous69 is offline
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Default PWM cooling fan(s) control using ECM

I am trying to figure out what would be required to set up Pulse Width Modulated cooling fan control using the E67 ECU that came with my LSA crate motor.

The ECU that GM Performance sells to go with the LSA crate engine (part number 19259293) comes set up for On/Off fan control. I would prefer PWM fan control.

Of course I could find a stand alone PWM fan controller and run it independent of the ECU but I would prefer to have the ECU control the fans using more inputs than just the engine temp. (Such as AC pressure and ambient temperature).

Here is what I am wondering:

Can I use the PWM fan control module (Part number 10377609) that is used in the ZR 1 Corvette which also uses the E67 ECU and drive it with a signal from my ECU just like the ZR 1 Corvette does?

I'm assuming I would need to find the correct pin on the ECU and add a wire. If so, I have no problem with doing that. Does anyone know which pin that is on the E67 ECU?

I think the Trailblazer SS also used the E67 ECU. It uses pin #64 for PWM control of the cooling fan clutch. Might that be the same one the ZR 1 uses to drive the PWM fan control module?

Would the algorithms for PWM cooling fan control already be in my ECU or would they be completely absent? If absent, could I have a tuner grab that subroutine from a ZR 1 Corvette program and install it into my ECU?

Thanks in advance for any words of wisdom.

Last edited by Lous69; 02-09-2013 at 08:33 PM. Reason: typos
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