PWM cooling fan(s) control using ECM

[mikels]

Originally Posted by Lous69

1.Buy the PWM fan control module used on all C6 Corvettes

2. Find a pin out diagram for the E67 ECM like the one that came with my LSA crate engine. Best bet would be the pinout for the C6 ZR1 corvette.

3. Find a wiring diagram for a ZR 1 C6 Corvette that shows the wiring between the E67 ECM and the PWM fan control module.

4. Add a wire from the PWM signal output pin on my E67 ECM and run it to the PWM fan control module.

5. Purchase AC pressure sensor used in the C6 corvette and install in my system.

6. Have my ECM programmed to provide the PWM output signals I prefer to the output pin I added the wire to.

Just add step 5.5 - wire AC pressure sensor to ECM (which will also be on wiring mech for ZR1 Corvette) and you've got it.

Be sure to check origional crate engine harness - they run Fan 1 and Fan 2 output to fan relay - you need Fan 1 to go to PWM control module - and have fan power leads NOT running through relay - just a fuse.

Corvette fan (400 watt) pulls ~32 amps peak, so size fuse, wiring appropriately.

SRX fan (850 watt) we've used on Stielow's latest cars pulls ~65 amps peak.

Dave