E-fans, Diablo, And Nelson

[[__--MUD--__]]

Look at the compressor clutch... There are only a few wires running to it.

It should be Dark Green / White

I dont know what they are directing you to do, but pin 43 off C2 is the compressor. Pin 33 isn't even used.

[ryaleon]

Alright I'll go look for clutch wire. so dark green with a white stripe? They claim blue pin 42 is low speed and pin green 33 is high speed/ac pressure sensor.

[[__--MUD--__]]

Easy to verify- Jab a 12V test light at the compressor end, turn the ac on/off. Light should follow your switching. Hit pin 43, should do the same.

The line on the compressor side should be solid dark green. On the PCM side it should be dark green & white.

[[__--MUD--__]]

Full pinout-

http://www.lt1swap.com/2004vortec_pcm.htm

[ryaleon]

Originally Posted by [__--MUD--__]

Full pinout-

http://www.lt1swap.com/2004vortec_pcm.htm

Thanks for that I have it bookmarked now. So green 43 is the pin to use then.

[[__--MUD--__]]

****, I bet you need to have the pcm programmed for it to work as they directed you for it to control the fans.

big thread here-
http://www.performancetrucks.net/for...-432250/page4/

[ryaleon]

It is programmed with the diablo tuner. But it wont activate the fans when the ac is turned on. Only when coolant gets up to a certain temperature. I don't think diablo has the ability to tune it the way it needs to be. Only options are fan1 and fan2 temps.

[[__--MUD--__]]

I'd call nelson back to verify what we think is going on. You may have to call diablo to see if it will set a parameter for an option thats currently non-existant in the PCM.

I personally dislike these handheld tuners...There are so many people doing mail order tunes cheap- under $250. Give you full control vs the limited options on the handhelds. Depending on who you use, additional changes/re-programming could be free to $100.

Worst case your diable wont do what needs to be done, uninstall it, sell it, and get a custom tune and your good to go.

if your driving the truck, I'd temporarely hook it up to the clutch wire so you dont smoke your AC by not pulling air over the condensor.

[tomp]

Get Nelson on the line for assistance in answering the question, "Does the harness support both temperature activation on Pin 42 and High Mode when AC is enabled for pin 33"? I was not aware of the harness supporting both on H2s I have seen this kit installed on int he past. If it does not support both, a seperate relay and diode will have to be installed for the AC Engagement to override the fans and increase speed from low to high.

Good luck, sounds like you are almost done...

Which fan shroud did you use? One from 2008+ H2? I am hearing this is a very good mod on older H2s with manual belt driven fans, adding about 15-25 hp and slight increase in MPG. Also gets rid of the roaring sound when running AC, as well as overheating that is a result from running AC while parked.

[ryaleon]

on the pcm side it will be in the large loom correct?