97 PCM Wiring Diagram - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-25-2006, 08:48 AM   #1
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Default 97 PCM Wiring Diagram

My friend has a wideband scanned (LM-1) and as offered to help me tune Knight Fire.
However, he was requesting a wiring diagram of the PCM inorder to get the RPM signal off it.

Anyone have one? or know another way to get the RPM signal with the LM-1?

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With the LM-1, I would think that you will want to log your rpm signal as well at the very least. It can log in addition to the 02 readings, up to 5 other inputs, as long as its a analog signal and doesn't go above 5 volts and doesn't goes below ground. But more inputs takes more time to hook up. Having your pcm accessable with a wiring diagram of it would help considerably.
Here'* a link to the LM-1
http://www.innovatemotorsports.com/products/lm1.php


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Old 05-25-2006, 09:14 AM   #2
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I have a 99 FSM for my 97. does anyone know if the pcm section is the same for these 2 years
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Old 05-25-2006, 09:26 AM   #3
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Should be. I have 98 at home..
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Old 05-25-2006, 10:19 AM   #4
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You guys are the experts.... but I didn't think they were the same.
(maybe it'* the programming that isn't the same)
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Old 05-25-2006, 10:30 AM   #5
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Hmmm I'll ask Elmo for some input. He was researching harnesses for a swap and should have the info if the PCM pinning is the same.
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Old 05-25-2006, 11:44 AM   #6
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pm sent
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Old 05-25-2006, 02:32 PM   #7
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Quote:
Originally Posted by ELMACHOGERACHO
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You have the wiring..ahh..

any idea if they are the same Matt?
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Old 05-25-2006, 02:38 PM   #8
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The PCM outputs ASCII not voltage. Normally a wideband sensor would connect to something like the A/D connector for a DHP PowrTuner which can log voltage signals along with all the other good stuff.

The 97 PCM is different from later models.

Cheers,
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Old 05-25-2006, 02:45 PM   #9
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Perfect....

Thanks Foghorn.


Now my PT doesn't have the A/D option.
What about using something like a clamp or something that reads the signals from the spark plugs or something... would/could that read the RPMs?
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Old 05-25-2006, 02:50 PM   #10
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My Mechanic buddy has a clamp thing that goes around the plug wire to read RPM..I think it'* possible. Is an Aeroforce gauge anything that would work for you?
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