ls1nova71

iTrader: (4)

I don't know exactly what it changes, but I do know that it's needed if you ever need to do a crank relearn, so the PCM is using it for something. Similar to the wire in an F body that needs to be grounded in park and neutral. I'm sure someone smarter than me would know more about it.

Project GatTagO

iTrader: (7)

Thanks! I hope someone has some more info. I am trying to decide if it is worth installing and wiring the PNP to my Holley Dominator. It doesn't;t need it for proper driving and shifting, but it might be helpful for other things.

Andrew

dlwilson

iTrader: (1)

I don't know, but from what I've read on various forums I think it does two things:
- runs the engine differently whether it's in P/N or in a gear
- controls the dashboard display of what gear the transmission is in

Hopefully someone who knows can comment.

Project GatTagO

iTrader: (7)

Thanks! It would be good to know for sure, so if anyone has more detailed information, please post it.

As of now, I am going to wire the inputs to my Dominator ECU. At the very least, I will be able to display PRND on my digital dash, and maybe use them for some tuning.

Andrew

Project GatTagO

iTrader: (7)

In the above diagram, can I get a clarification on which cavities are for which gear? I am using the style on the right with the two connectors. There are cavities A, B, C, D. Is P for park? If so, then what are A, B, C?

Andrew

dlwilson

iTrader: (1)

Again, I don't know for sure, but I've always assumed that the transmission is using all four wires to encode the gear, because obviously PRND321 is more than four wires. I would expect that the PCM would see the pattern of wires on/off and use that to determine which gear the transmission is in.

I wired this up recently on my 2000 5.3 swap. I had to add the extra wires to the harness. I didn't notice any difference at all in how the engine behaved, but I could see the selected gear in HP Tuners, so I know it was working correctly.

Dimebagbubba

I have a 2003 Tahoe LT with 5.3 and 4l60e, previous owner messed up neutral safety switch and the 6 wire pigtail. I replaced both but the wires on the newish pigtail doesn't match the wires coming from the trucks harness. My truck doesn't have a purple wire but does have a grey one among other different colors. Where can I find the correct color scheme for a '03 Tahoe? Thanks for any help.