Fan 2 control wire pin #?
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Joined: Sep 2004
Posts: 231
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From: Alberta, Canada
Car: 80 GMC K35
Engine: TPI 355
Transmission: NV4500
Axle/Gears: 4.10
Fan 2 control wire pin #?
Hey guys!
At the moment, I have my secondary fan controlled by a temp switch in the head of the engine. I've noticed that the 8D prom allows for two different fan control relays. What is the pin for Fan 2?
At the moment, I have my secondary fan controlled by a temp switch in the head of the engine. I've noticed that the 8D prom allows for two different fan control relays. What is the pin for Fan 2?
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Joined: Sep 2003
Posts: 1,409
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From: Texas
JP86SS wrote:
I'm not sure how to add more but there are several options that I've been looking into for using the existing Outputs.
Inputs do not seem to be a problem, there are several available.
Without removing any emmisions functionality theses are available:
Outputs:
"F8" Fan 2
"F3" A/C clutch
"F5" (has two quads in parrallel)
"E8" Fan 1 (If you don't run fans)
"A2" Relay 2 output
That is 4 for sure, 5 if you don't use the fan output.
If Emmissions are removed the following become available:
"F7" Can purge sol
"F4" Air Divert
"F2" Air Port sol
"E9" EGR Sol
And if you run a manual ""F6" TCC sol is there as well.
Lots of fun options to play with.
I'm close to getting control over these by locating the bits that operate the PWM and digital registers and will be posting what I have found so others can go farther with what I've started.
Once we know how to run each of them on thier own anything can be done with them.
Last edited by JP86SS : 12-25-2005 at 07:03 AM.
I'm not sure how to add more but there are several options that I've been looking into for using the existing Outputs.
Inputs do not seem to be a problem, there are several available.
Without removing any emmisions functionality theses are available:
Outputs:
"F8" Fan 2
"F3" A/C clutch
"F5" (has two quads in parrallel)
"E8" Fan 1 (If you don't run fans)
"A2" Relay 2 output
That is 4 for sure, 5 if you don't use the fan output.
If Emmissions are removed the following become available:
"F7" Can purge sol
"F4" Air Divert
"F2" Air Port sol
"E9" EGR Sol
And if you run a manual ""F6" TCC sol is there as well.
Lots of fun options to play with.
I'm close to getting control over these by locating the bits that operate the PWM and digital registers and will be posting what I have found so others can go farther with what I've started.
Once we know how to run each of them on thier own anything can be done with them.
Last edited by JP86SS : 12-25-2005 at 07:03 AM.
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
So, it looks like F8 is already set up to control the second fan, huh? Probably provides the ground like most other ECM controls? I seem to remember seeing some more detailed info on this a while back. May have to do a search on that idea. Then again, the idea of a mechanical operation of the second fan might not be such a bad idea if something gets hosed in the BIN or ECM.....
Thread Starter
Member
Joined: Sep 2004
Posts: 231
Likes: 0
From: Alberta, Canada
Car: 80 GMC K35
Engine: TPI 355
Transmission: NV4500
Axle/Gears: 4.10
Yep, I wired my truck up with a fan switch under the dash so I could force the fans on in the case of ECM failure, with indicator lights above them to inform me of when each fan is on.
Unfortunately, its looking like my two fans are not quite going to be adequate for my mild 350. It may be due to it's not being tuned very well yet, but she got into the 230s yesterday with an ambient temperature of 90F just idling, so I may wind up pulling both off in favour of a stock mechanical fan until I am able to find myself a Taurus 3.8, or Windstar 4.1 dual speed dual fan housing for my truck. They are Ford fans, but they fit the Chevy rad nearly perfectly, and are very low profile compared to the Chevy fans. Also move more air on low speed than a stock clutch fan moves. The fans I have right now are off a V6.
I'll give the F8 pin a shot however, and see if I can get her to come on. I'll just use the temp sending unit in the head as an idiot light sender. I don't want my engine over 220 degrees anyways.
Unfortunately, its looking like my two fans are not quite going to be adequate for my mild 350. It may be due to it's not being tuned very well yet, but she got into the 230s yesterday with an ambient temperature of 90F just idling, so I may wind up pulling both off in favour of a stock mechanical fan until I am able to find myself a Taurus 3.8, or Windstar 4.1 dual speed dual fan housing for my truck. They are Ford fans, but they fit the Chevy rad nearly perfectly, and are very low profile compared to the Chevy fans. Also move more air on low speed than a stock clutch fan moves. The fans I have right now are off a V6.
I'll give the F8 pin a shot however, and see if I can get her to come on. I'll just use the temp sending unit in the head as an idiot light sender. I don't want my engine over 220 degrees anyways.
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