Installed my friend truck 2004 that we order efan and harness from lsx just chevy trucks.com. Have you hear this? Okay I need your help. I have small problem. I kinda confuse try to understand the instruction. I have poor English being hearing impaired. Forgive me again.

When I pull the ECM. Blue cover so I inserted into pin 42 with green wire. And inserted into pin 33 for blue wire in same blue cover. Fans still not
Work anything. Turn ac on and not turn fan. Over 210 temp won't do anything. I readed over and over on the instruction. They say connector 2 which other green cover that mean I need insert pin 33 for blue wire? If
It is that one. I have to go back and re-do pin. Let me know.

 

The Green wire goes to pin 42 in the blue covered connector, this is fan 1.
The Blue wire goes to pin 33 in the green covered connector, this is fan 2.

And you also have to have a tuner or someone with the software (hp tuners, efi live, etc) enable the fans in the pcm

 

So can't drive? Will they turn fans on when temp go up 210 degree? Or still have to get tuner do it?

 

I repin to correct one. For blue wire go to #33 on green connector. The green wire stay in #42 on blue connector. I let run on and drive. I see temp start go up to over 215 and I check fans if they turn on. It still not. Any idea.

 

If you have not had the truck tuned with HP or EFILive it will not turn the fans on as the bits in the PCM are not enabled to do so. The truck needs tuning changes to make the fans work. They will not ever come on with a stock 2004 clutch fan trucks tune!

 

You MUST activate them in the tune!

 

You have answered your own question...they have to be tuned in

 

That what paper say need to tune. I thought it can be somehow work for temp. But I see this comment. I got it. Many thanks. We will take PCM sent to place to tune. I really appericate for your help and feedback. I'm learn something new now.

 

You could put the power wire in the furl pump relay under the hood for temporary like I did until I got my LS Performance Wiring harness...it would constantly run though