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CDeeZ
Forum Newbie
Posts: 79
Reg: 07-29-10
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08-08-12 04:08 PM - Post#2257258
I recently upgraded my old style TBI ECM to a TBI PCM.
One of the advantages of the newer style PCM is that it has the capability to control E-fans.
I used to control my E-fan with a simple toggle, but this is much cooler, and cost next to nothing.
Does anybody else have a similar set up as me? Would anybody be interested in more information?
| 1990 RCSB|T56|14bolt|4.88|TrueTrac|Cam|.060 over|ported_polished|Head ers|3" duals, "H"|E-fan|Ult TBI|2"/4" drop|16197427 PCM conversion-DIY tune|6lug swap|16x8 AR-Atlas |
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leon phelps
Valued Contributor
Posts: 3020
Loc: Croydon Manor, PA
Reg: 06-04-05
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08-08-12 06:36 PM - Post#2257302
In response to CDeeZ
I have a pcm in my 65. the pcm is usually programmed to a certain temp to come on.
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 someotherguy
Moderator
Posts: 23407
Age: 43
Loc: Texas
Reg: 08-01-03
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08-09-12 05:08 AM - Post#2257424
In response to CDeeZ
Absolutely; temp-controlled is the way to go with e-fans instead of a switch - please do post the info here as I'm sure many would find it useful.
Richard
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CDeeZ
Forum Newbie
Posts: 79
Reg: 07-29-10
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08-09-12 07:42 PM - Post#2257725
In response to someotherguy
Well the early style TBI computers (the ECMs) did not have the capability whatsoever to control fans. And from what I understand, the TBI PCMs (later style computers) never controlled an electric fan from the factory. But it is easy to make one of these PCMs control your E-fan. Most of the information on the internet about controlling fans with a PCM is specific to the ‘7427 PCM which usually runs $0D code mask, but it can be done with other TBI PCMs as well.
Other than having the PCM, you have to have a minute knowledge of how to work with hexadecimal, because you have to incorporate the fan code into your binary file that runs the vehicle. It’s not as scary as it sounds, quite simple actually. You can find the fan code all over the internet at various places, then all you have to do is simply copy and paste the fan code into the proper addresses in the binary. Once this is done, you can control the fan to your liking. Just open up the tuner program of your choice, load the fan control definition file that can be found paired with the fan code and you can set the fan to come on at whatever temp/speed you desire.
I can’t take credit for writing the code that controls the fan, I’m not sure who originally came up with it as this idea of controlling fans by the PCM has been used by many. Regardless, there are any number of places on the internet that you can find and download the code necessary to control Efans with these PCMs.
You will also need a relay for the fan. Most people seem to like wiring two 30A relays in parallel. If this works for them then that’s great. Me personally however, I like to keep things simple so I looked up “coolant fan relay” on Napas website and had a 50A relay ready to pick up at the store the very next day for the nominal sum of like 9 bucks.
Here is the way I wired my relay:
PIN 30 = BATT +
PIN 85 = PCM PIN E3
PIN 86 = BATT + (switched 12v would probably work for this one)
PIN 87 = FAN
Works like a charm.
I’m thinking about adding an indicator or LED or something and installing it in place of the old toggle switch, that way I’ll know when the PCM is commanding the fan ON.
| 1990 RCSB|T56|14bolt|4.88|TrueTrac|Cam|.060 over|ported_polished|Head ers|3" duals, "H"|E-fan|Ult TBI|2"/4" drop|16197427 PCM conversion-DIY tune|6lug swap|16x8 AR-Atlas |
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