Hey,

I'm in the final stages of swapping an LQ4 out of a 2007 Silverado 2500 into my old YJ. I have an NV4500 in it and so I had the computer re-programmed using whatever stock programming is used for a LQ4/NV4500 (minus VATS, Torque Mgt., etc.).

I've found a little difference in the physical wiring harness that has necessitated adding a wire to the PCM for the clutch position switch (that I'll have to install on the clutch pedal/linkage to get the cruise to work right). It's pin number 35, Gray Wire, circuit number 48, CPP Switch Signal (M/T) on C1 into the main PCM. (There wasn't a wire there because the donor truck was an AT, but there is now)

I have a couple of questions regarding this:

1. Is this a normally open switch that would connect the wire to +12V when the clutch gets pressed or a normally closed switch (like the TCC brake switch for the cruise control) that has +12V flowing through it all the time EXCEPT when the clutch is pressed?

2. Are there any other "gotchas" I'm missing when trying to get an A/T harness to function correctly with a manual transmission?


Thanks!
Jake

Bumpity

i posted this on performancetrucks.net (http://performancetrucks.net/forums/showthread.php?p=4250624#post4250624) for you

i posted this on performancetrucks.net (http://performancetrucks.net/forums/showthread.php?p=4250624#post4250624) for you

Hey, thanks. I've also cross-posted on LS1Truck and LS1Tech...Performancetrucks is the only one I'm on that I hadn't posted this to yet...

So far...NUTHIN'!


Thanks again,
Jake

from ptnet
The CPP has both a normally open circuit and a normally closed circuit in it. The normally closes circuit send 12v to the ECM at all times. As soon as you start to push the clutch, the normally closed ciruit opens removing the 12v from the ECM and disabling the cruise control. When the clutch is pressed all the way down, the normally open circuit is closed sending 12v to another pin on the ecm which will allow the vehicle to start.

I have a couple of questions regarding this:

1. Is this a normally open switch that would connect the wire to +12V when the clutch gets pressed or a normally closed switch (like the TCC brake switch for the cruise control) that has +12V flowing through it all the time EXCEPT when the clutch is pressed? I think it's NO switch and its just used to cut-off the cruise when the clutch is pushed, a safety feture. But I am not 100%sure as all I miss with is the autos:)

2. Are there any other "gotchas" I'm missing when trying to get an A/T harness to function correctly with a manual transmission?


Thanks!
Jake Looks like you coved everything, did you install a VSS?

Looks like you coved everything, did you install a VSS?

Yeah... I've got an NP241 so I already had one going to my Speedo... I still don't know what the other pin-out is (for the starter interlock). I've posted a reply on the PT thread in hopes of discovering this... Going to go over the pin-outs with a fine-tooth comb myself as well. I'll post up here if I figure out anything.


Thanks,
Jake