ECM Pin location
07-14-2005, 01:02 PM
#1
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ECM Pin location
Can Any one give me a site or some info on pin location for a 2002 ECM?? I would like to know what the unused pins on my ECM are for.
Thanks.
Thanks.
07-15-2005, 09:48 AM
#3
Originally Posted by TurboBerserker
I'd love to see this as well.
, I don't think it there is any publication besides the actual circuit board schematic (board in the ECM) and who would have that besides GM and....who makes the ECM's...delphia? I have in front of me the snap on and shop key diagrams and they still don't post what the unused pins are for. I only see getting every wiring diagram there is for all the vehicles this ECM is used for and then just deducting from one to the next....and who is gonna do that? LOLI do know from the 2000 5.3 1500 silverado to the 2002 6.0 2500HD I found the o2 heaters to have different pins (especially depending on whether or not they are case or isolated ground). Those pins were labeled on the '02 ecm but not on the '00 ecm.
07-19-2005, 12:36 AM
#4
IS this what youre looking for?
Any help? I have 4 more pages of diagrams. Not sure if you'll be able to see in this post but, if not PM me and I can e-mail it to you. 
Edited for a better picture...How do I make it huge so you can read it?
Edited for a better picture...How do I make it huge so you can read it?
Last edited by 1SlowHoe; 07-19-2005 at 01:07 AM. Reason: better pic
07-19-2005, 11:30 PM
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What specific thing are you trying to look for? I know what all the un labeled outputs are, But they also need turned on in the hex. If you tell me what specifically you are wanting to do, ill help you out. Jes
07-19-2005, 11:52 PM
#7
since Jes chimed in, I will do a minor hijack. 
Why does my truck drop to 350 or so rpm when the A/C compressor kicks on if I'm at idle. I swear it almost stalls the truck. I had 2 or 3 dropped injectors for a month and finally got the wiring fixed. The ac problem seems to be getting better over time (last 2 days) is my pcm just relearning how to run with all 8 injectors firing instead of 7 or 6 or 5 depending on the day?
Why does my truck drop to 350 or so rpm when the A/C compressor kicks on if I'm at idle. I swear it almost stalls the truck. I had 2 or 3 dropped injectors for a month and finally got the wiring fixed. The ac problem seems to be getting better over time (last 2 days) is my pcm just relearning how to run with all 8 injectors firing instead of 7 or 6 or 5 depending on the day?
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07-20-2005, 11:30 AM
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Originally Posted by OKLAGMCRUISER
I know that pin 42, once the pcm is activated, is for the electric fans option.
Thats pretty much what I want to know. (for now) With HPTuner there is options for the fans to turn on low and high speed. With a nelson harness (only using pin 42) the ECM only controls the fans low speed. I want to know what pin I could use for high speed. But the more I think about it the more I doubt it is possable, because if it was Allen would have done it that way too.
07-20-2005, 08:57 PM
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The other output for highspeed fan when turned on is pin number 33 on the RED connector.
They are a negitive output from the pcm. so to wire a relay you would do.
30 all time battery
85 all time battery
86 output from computer fan turn on
87 lead to positive side of fan,
87a is left blank.
And to make a performance button and auto/manual transmission shifting button i can do those also.
They are a negitive output from the pcm. so to wire a relay you would do.
30 all time battery
85 all time battery
86 output from computer fan turn on
87 lead to positive side of fan,
87a is left blank.
And to make a performance button and auto/manual transmission shifting button i can do those also.