Cant get high fan with a/c

[lowws6]

I have done a 411 PCM swat to my 96 gmc, installed e-fans with two speed control. I want the fans to come on high when my a/c is on because my high side pressure is about 250psi. I have done everything I can but get no response. I wired 5volts to the a/c pressure sensor circuit and changed G0918 to 1kpa and G0919 to 0kpa. I am thinking the PCM does not support this option.

[lowws6]

All the 411 conversions here and nobody knows anything about this? Come on dont tell me I stumped the efilive forum.

[5.7ute]

Have a look at this thread. It appears that the early pcm's dont support the 2 speed function & you need to trigger the fans from the A/C.
http://forum.efilive.com/showthread....t=efans&page=2

[lowws6]

The two speed fans are working fine, its just the a/c trigger portion thats not working.

[ChipsByAl]

Are you using the 02 Express Van file for your base tune?
Al

[lowws6]

Yes, 02 express

[ChipsByAl]

Compare what you have wired to this Camaro circuit.

[lowws6]

I have everything except the pressure sensor. I have put 4 volts at C2 14 to get the ecu to think there is a switch there and still nothing.

[ChipsByAl]

If the pressure sensor is not working correctly, the PCM may not "believe" it. Try disconnecting it and see if it works. Compare your current file to a 2002 Camaro file and see the differences involving a/c and the fans. You may have some codes disabled.
Al

[lowws6]

I dont think i am explaining this well. I do not have an a/c pressure sensor I am just using C1 45 and C2 14 with a resistor between them to get 4 volts at C2 14. I know it works because I can see 4 volts show up on the efi live PID. I just dont know why the PCM will not turn the fans on high. I have it set up to turn the low fan on when the intake temp is above -40 C and the a/c is on and that works fine but no high fan.