Clutch switch wiring questions

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Apr 15, 2009 | 05:59 PM

Wades SnS

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From: VA

Clutch switch wiring questions

I have a 97 sonoma with a ls1 and a t56 I have rear that it is important to have a switch hooked up to the ecm for it to determine what mode it is in.. park/nuetral or drive. my only problem is that I do not have a bcm from a fbody and the diagram shows that the clutch pedal position switch runs throught the bcm and only controls the starter solenoid. This makes sense to me but I know that there is a wire on Connecter 1 of the ecm (i think it is 32) that is a clutch pedal position signal. What does this do and how do I wire to make it work.

Thanks,
..RJ..

Apr 16, 2009 | 02:20 PM

Rodder

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what year LS1 PCM? I think there are three circuits coming off the clutch switch in a '99. One is for the PCM, one is for the starter relay (though BCM?), and one is for cruise control. Not 100% sure on the cruise control, but I think there was a circuit for it.

I'm not running a clutch switch in mine. The PCM can do so cool stuff with the timing to smooth out the engine as you're letting out the clutch. That's the only thing I've found that I'm missing by not having a clutch switch.

Apr 16, 2009 | 05:21 PM

s10-den

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Hmmm,I know of a couple of s10 ls1 t56 swaps, non ever said anything about this issue, but makes since...

Apr 17, 2009 | 06:56 AM

Wades SnS

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It is a 2000 pcm and I have never had any real issues without the switch. I have been running my swapped sonoma for a little over 5yrs but I would like to hook thus switch up to see what and how it affects my idle transitions. Does anyone know if the signal wire needs to be grounded or power and should it be energized when the clutch is up or down?

Thanks,
..RJ..

Apr 17, 2009 | 07:53 AM

Jones'n

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As far as I know, the CPP does have some part to do with the idle dropping when the computer sees you have pressed the clutch. It's not a real critical item, but it may or may not be that noticeable if it is there or not.
The circuit is supposed to see ground when the pedal is up (i.e. not pressed) and it is just supposed to see nothing at all when the pedal is pressed.

Apr 17, 2009 | 08:27 PM

Wades SnS

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So basically wire a normally closed switch with one side grounded and the other to pin 32 on the pcm. Hmm on my s10 the wire that corresponds with the cpp switch for the pcm is hot not a ground. Does anyone have a actual diagram for this?

Thanks,
..RJ..

Apr 18, 2009 | 08:37 AM

Jones'n

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you are correct, the s-10 trucks use power, the camaro has power and ground on the CPP. 12V is used to disengage the cruise control, but it is a ground signal that goes to the computer.
I don't have the schematic at the moment, but that's the way it is.
Go pay the $25 at alldatadiy.com and look it up.