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ECM Pin location

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Old Jul 20, 2005 | 10:13 PM
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So the ECM controls the ground on both fan setting right?
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Old Jul 20, 2005 | 10:16 PM
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yes that is correct.
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Old Aug 21, 2005 | 09:07 AM
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Does this mean you have a harness for fan activation to make it work like the stock version instead of what Nelson does?
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Old Jul 24, 2006 | 12:52 PM
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TTT do to PIN 33 is already used up on my truck.... I really need to find out the other pin location for the fans.........
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Old Jan 4, 2007 | 04:18 AM
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could the unused pins be used for inputs for wideband afr, fuel press., egt, dual tune, valet mode, nitrous, et cetera? What about outputs for certain gauges?
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Old Jan 4, 2007 | 07:58 AM
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It is my understanding that the Pin 33 only works on 03+ PCMs.

Thread link read from page 7-10
https://www.performancetrucks.net/fo...=blowing+relay

GM Factory Efan wiring harness, dual speed.
15216055

i hope that helps
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Old Jan 4, 2007 | 08:31 AM
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Originally Posted by Blown02Sierra
could the unused pins be used for inputs for wideband afr, fuel press., egt, dual tune, valet mode, nitrous, et cetera? What about outputs for certain gauges?
That may be an option..

Blown02Sierra, you are 100% correct..

This thread is abit older, I bought a aftermarket fan controler and temp sensor to control the other setting...
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Old Jan 4, 2007 | 08:36 AM
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Sorry i did not even notice the dates...
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Old Jan 4, 2007 | 08:58 AM
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Originally Posted by Blown02Sierra
could the unused pins be used for inputs for wideband afr, fuel press., egt, dual tune, valet mode, nitrous, et cetera? What about outputs for certain gauges?
People are already using the wires for the egr they are removing for a wideband feed, which can be read through HP Tuners without the enhanced interface.
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Old Jan 4, 2007 | 09:28 PM
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Well, i never had egr and i'm using efilive. Is that still an option for me? And what about the open pins? Also, can my 02 pcm use pin 33 for the hot setting>?
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