High speed fan and low speed fan wiring crossed gen4 ecu

[Timo Pajala]

So i have 2008 silverado ecu and my fan wires are crossed and they are reley operated, is there anyway to programm then so the fan2 comes on first or do i have to wire then again? Ill but my tune in here if some one can help me out?

state vs desired:0->1=47 fan output1: 0 1 1 temp: 43=93celsius, 45=95, 47=97, 49=101celsius.
1->2=49 fan output2: 0 0 1

1->0=43
2->1=45

so the problem is that they start on high speed and never low speed.

sorry if this is badly written. I can post my tune if someone wants to look at it. Been waiting for new gen4 injectors for my car and right map sensor also because it had the wrong map from the engine builder etc. Been working the clitches for long time, had wrong o2 sensors, busted intake etc

[mikez71]

I *believe* you would change the 'fan output control vs. current state.'

output 1 : 0 0 1
output 2 : 0 1 1

That's my ASSUMPTION on how it works. Shouldn't hurt to give it a quick test?

[Timo Pajala]

thanks, ill give it a go and try out