PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

PCM Controlled Shift Light

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Old Sep 13, 2008 | 10:11 PM
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Default PCM Controlled Shift Light

Here is the link to the how to and a video I made of mine today. I just used all the parts listed in the post.

http://www.hptuners.com/forum/showth...689#post143689
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Old Sep 14, 2008 | 02:24 PM
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Just one minor correction to avoid confusion!


By 98 all GM vehicles had PCMs and not VCMs.

I guess that is trivial but just saying...
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Old Sep 16, 2008 | 08:39 AM
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Sweet! Thanks for the link, that will give me something to do this weekend. On the realy, did you just use pin #47 for the ground on the realy? And are other year models the same as in the pin # on the pcm? Also im not sure if your vid is working or not, Everytime Ive tried to watch it I end up at the photobucket home page.

Last edited by Z'mnypit; Sep 16, 2008 at 08:51 AM.
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Old Sep 16, 2008 | 09:43 PM
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Didnt use the relay. I cant even tell they are lit at night.
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Old Sep 17, 2008 | 11:22 AM
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Is there already a wire coming out of #47?
If so what's it supposed to control stock and do I cut it or splice in to it?
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Old Sep 17, 2008 | 09:35 PM
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No wire or pin. You will need to put a pin and wire in.
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Old Sep 18, 2008 | 09:40 AM
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Got any pics of where you monted the LEDs etc? the vid doesnt work or Id watch it.
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Old Sep 18, 2008 | 04:45 PM
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How is the lag when shifting WOT at 6200 rpm? I'd like to see a log with this circuit connected to a HP Tuners MPVI harness (or equivalent) against the RPM PID and see how accurate it is...
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Old Nov 7, 2008 | 08:56 AM
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Originally Posted by blazin
No wire or pin. You will need to put a pin and wire in.
I did this yesterday finally and the Red connector Pin 47 did have a wire in it. It was yellow I believe. I got everything made and wired up but the LEDs have a real dim glow to them when they arent on. Guess Ill have to try a relay and see if they helps.
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Old Nov 7, 2008 | 09:45 AM
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I wouldn't try and drive a relay with that output. Try upping the resistor you are using with the LED to limit it's 'idle' current; that will get your desired result though you may have to play with it a bit.
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Old Nov 7, 2008 | 09:48 AM
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Originally Posted by Frost
I wouldn't try and drive a relay with that output. Try upping the resistor you are using with the LED to limit it's 'idle' current; that will get your desired result though you may have to play with it a bit.
Good thinking.. Ill pick up some resistors at radio shack today.

Thanks!
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Old Nov 7, 2008 | 05:42 PM
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Mine have the very very dim glow that I dont even notice at night so I said F it.
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Old Nov 17, 2008 | 06:44 PM
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Originally Posted by blazin
Mine have the very very dim glow that I dont even notice at night so I said F it.
Same here but whats weird is after I put all the settings in the file and loaded it into the PCM the glow was gone. I have no glow until it reaches the desired RPM.

One last question, Is this possible on a 98? I went to do this mod to a buds 98 trans am and first thing I noticed was the hpt file didnt have the option to activate the shift light, 2nd thing I noticed was the PCM was wired differently. Is it possible to load a new .hpt from a 99 or etc and if so which pin on the PCM will be used?

Thanks!
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