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diagnostic port help

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Old 08-28-2007, 08:46 PM
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Default diagnostic port help
I have a Sierra engine harness going on an LM4 and I'm modifying the stock harness for this installation in my 65 Vette. I want to have a diagnostic port and haven't found any threads on what wiring I need for the port. I have found the pin outs for the truck ecm. Did I miss something? Any help appreciated.
Bob
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Old 08-28-2007, 09:16 PM
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its in the first post of the sticky FAQ. about 1/4 of the way down the page.

https://ls1tech.com/forums/conversions-swaps/312119-ls1-swap-faqs.html
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Old 08-28-2007, 11:50 PM
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Yep, you need +12v constant, ground, and the green wire coming from the blue connector (c1) pin 58 on the PCM.
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Old 08-31-2007, 04:46 PM
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Thanks guys. That won't be hard at all. I was expecting a more complex harness than that.
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