EBL Fan Control
#1
Senior Member
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Posts: 785
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 454SS
Engine: 454 TBI
Transmission: TH400
EBL Fan Control
Must be missing something obvious. Using pin C2 on the EBL and the recommended relay. Have tried to relays. WUD shows fan is being called for, but am getting nothing.
#2
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
The ECM output pin will go low when the fan is commanded on. This is with the stock cal where the "Option Word 3 - Bit 0 - FanHi" flag is un-set (off).
The relay coil is to be wired from +12 volts (switched) and then the other relay pin to pin C2 of the ECM. A simple test is to key-on, engine-off and ground the ECM pin. That should activate the relay and turn on the fan.
You can ground the quad-driver outputs without issue. Just do not tie one to +12 volts.
These relays also have an anti-kickback diode across the coil. So it is important that the coil pins are connected properly (in regards to +12V and the ECM driver).
It is also possible that the quad driver is bad. With the WUD showing the fan on measure the voltage at ECM pin C2. It should be lower then 0.7 volts.
RBob.
The relay coil is to be wired from +12 volts (switched) and then the other relay pin to pin C2 of the ECM. A simple test is to key-on, engine-off and ground the ECM pin. That should activate the relay and turn on the fan.
You can ground the quad-driver outputs without issue. Just do not tie one to +12 volts.
These relays also have an anti-kickback diode across the coil. So it is important that the coil pins are connected properly (in regards to +12V and the ECM driver).
It is also possible that the quad driver is bad. With the WUD showing the fan on measure the voltage at ECM pin C2. It should be lower then 0.7 volts.
RBob.
#3
Senior Member
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Posts: 785
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 454SS
Engine: 454 TBI
Transmission: TH400
Re: EBL Fan Control
Got it figured out.
I had the option bit set.
The diagram shows no ground going to the relay. Would the ground go to "C"?
![thank you](https://www.thirdgen.org/forums/images/smilies/thanks.gif)
I had the option bit set.
The diagram shows no ground going to the relay. Would the ground go to "C"?
#4
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
No need for a ground. Terminal C on the relay is left open.
http://www.dynamicefi.com/EBL_Drawings.php
RBob.
http://www.dynamicefi.com/EBL_Drawings.php
RBob.
#6
Member
iTrader: (2)
Join Date: Dec 2006
Location: Tacoma, WA
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: '91 Chevy 1500
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73
Re: EBL Fan Control
I'll be installing a set of dual fans from a 2K Camaro into my truck and I have a few quick questions.
Where do you get the actual terminals from for the ECM connector? There's just an empty slot there now, right?
Would I wire both fans to separate relays?
I don't know if these fans have a high and low speed yet since I won't have them for a few days. It sounds like the EBL will only control one speed, so should that be the low speed?
Thanks
Where do you get the actual terminals from for the ECM connector? There's just an empty slot there now, right?
Would I wire both fans to separate relays?
I don't know if these fans have a high and low speed yet since I won't have them for a few days. It sounds like the EBL will only control one speed, so should that be the low speed?
Thanks
#7
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
There may or may not be an emtpy slot at that position. It all depends upon the harness used for the install. For a pin/wire I just get one from a current connector. At yards on a vehicle where the engine was cut out the ECM harness connectors with about a foot of wire can be had cheaply.
The reason is that a cut out engine also means the harness was cut. So they are happy to get even a few bucks for the connectors and short wires.
For dual fans, there are several ways to go. Whether there is a need for two relays depends upon a couple of items. First is the current draw of the fans. If one relay can handle it, then can run both fans from the one relay.
Note that I don't recommend driving more then one relay from the ECM. So if two relays are required can have the ECM controlled relay kick on the other relay. This way both fans run together with just the one relay controlled from the ECM.
Another method is to run one fan from the ECM. Then run the other fan from a head temperature switch. Which switch to use will depend upon the thermostat used. Usually have the ECM kick on at a lower temperature. Then if the temp keeps rising have the head switch kick on the other fan.
Or, if these are two speed fans, run the low from the ECM, and have the head switch run the high speed.
RBob.
The reason is that a cut out engine also means the harness was cut. So they are happy to get even a few bucks for the connectors and short wires.
For dual fans, there are several ways to go. Whether there is a need for two relays depends upon a couple of items. First is the current draw of the fans. If one relay can handle it, then can run both fans from the one relay.
Note that I don't recommend driving more then one relay from the ECM. So if two relays are required can have the ECM controlled relay kick on the other relay. This way both fans run together with just the one relay controlled from the ECM.
Another method is to run one fan from the ECM. Then run the other fan from a head temperature switch. Which switch to use will depend upon the thermostat used. Usually have the ECM kick on at a lower temperature. Then if the temp keeps rising have the head switch kick on the other fan.
Or, if these are two speed fans, run the low from the ECM, and have the head switch run the high speed.
RBob.
Trending Topics
#8
Member
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
Join Date: Mar 2002
Location: Saint Cloud, FL
Posts: 385
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 Camaro RS
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73 Truetrac
Re: EBL Fan Control
So the fan use to NOT be controlled by the ECM?
Where does that green/white wire going to pin F on the relay come from now?
Where does that green/white wire going to pin F on the relay come from now?
Last edited by rsc350; 04-03-2010 at 06:11 PM.
#9
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
Any one or more will enable the fan via the relay via grounding.
If you are an EBL user, you can add the EBL fan output control to the others. That will allow the fan to be turned on/off by the ECM at a lower coolant temperature. And allow it to be controlled by the other three items.
RBob.
#10
Member
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
Join Date: Mar 2002
Location: Saint Cloud, FL
Posts: 385
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 Camaro RS
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73 Truetrac
Re: EBL Fan Control
Yup, 92 TBI and yes EBL user, my fan has up untill now been controled by a manual switch mounted in the ash tray. So your telling me I can find a wire behind my heater/AC controls and splice it to C2 on the ECM? I would not have to use a diode or anything to block to reverse direction or anything?
#11
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
Yup, 92 TBI and yes EBL user, my fan has up untill now been controled by a manual switch mounted in the ash tray. So your telling me I can find a wire behind my heater/AC controls and splice it to C2 on the ECM? I would not have to use a diode or anything to block to reverse direction or anything?
RBob.
#12
Re: EBL Fan Control
Besides the part number, if I go to my local Napa in Fredericton NB. They're gonna want to know the year, model of car, probably the colors inside the trunk and other silly questions.
So what do I tell them to find this part? Off a Camaro something?
http://www.summitracing.com/parts/NAL-10094701/
So what do I tell them to find this part? Off a Camaro something?
http://www.summitracing.com/parts/NAL-10094701/
Last edited by kataklysm01; 11-23-2011 at 09:27 AM.
#13
Moderator
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,432
Likes: 0
Received 224 Likes
on
210 Posts
Car: check
Engine: check
Transmission: check
Re: EBL Fan Control
Besides the part number, if I go to my local Napa in Fredericton NB. They're gonna want to know the year, model of car, probably the colors inside the trunk and other silly questions.
So what do I tell them to find this part? Off a Camaro something?
http://www.summitracing.com/parts/NAL-10094701/
So what do I tell them to find this part? Off a Camaro something?
http://www.summitracing.com/parts/NAL-10094701/
Those 3rd gens have an ECM controlled electric fan.
RBob.
#14
Re: EBL Fan Control
Freaking Napa doesn't have the connector and want 15$ freight on it... I found some on ebay.. will these work?
http://www.ebay.com/itm/Airtex-1P103...item415e79feb0
http://www.ebay.com/itm/BRAND-NEW-IA...sories&vxp=mtr
http://www.ebay.com/itm/Airtex-1P103...item415e79feb0
http://www.ebay.com/itm/BRAND-NEW-IA...sories&vxp=mtr
Thread
Thread Starter
Forum
Replies
Last Post