97 PCM Wiring Diagram

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May 25, 2006 | 07:48 AM

Merlin 91/97

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From: Halifax, Canada 91SSE / 97SSEi

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?

Quote:

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

Thanks

May 25, 2006 | 08:14 AM

sonoma_zr2

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From: Montevideo, MN MWBF '05, '06, '07 WCBF '06 '07 survivor

I have a 99 FSM for my 97. does anyone know if the pcm section is the same for these 2 years

May 25, 2006 | 08:26 AM

BillBoost37

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Should be. I have 98 at home..

May 25, 2006 | 09:19 AM

Merlin 91/97

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From: Halifax, Canada 91SSE / 97SSEi

You guys are the experts.... but I didn't think they were the same.
(maybe it'* the programming that isn't the same)

May 25, 2006 | 09:30 AM

BillBoost37

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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.

May 25, 2006 | 10:44 AM

ELMACHOGERACHO

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May 25, 2006 | 01:32 PM

BillBoost37

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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?

May 25, 2006 | 01:38 PM

Foghorn

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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,

May 25, 2006 | 01:45 PM

Merlin 91/97

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From: Halifax, Canada 91SSE / 97SSEi

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?

May 25, 2006 | 01:50 PM

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BillBoost37

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From: Enfield, CT

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?