VSS 4L80E 4WD Question, Which One?
01-02-2012, 12:58 PM
#1
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VSS 4L80E 4WD Question, Which One? I am using a stock harness on a '99 LQ4 to swap into a buggy with a Turbo 400 transmission. I have came to find out I need to buy a Dakota Digital generator for the Turbo 400 to generate a signal for the VSS input. However this harness must have been for a 4L80E equiped 4WD. So it has to sets of wires to two seperate VSS sensors.
One connector goes to pins 20 and 21 of the C2 connector. There descriptions are "VSS Reference Low" and "VSS Signal." The other connector is wired to pins 22 and 23 of the C2 connector. With descriptions "VSS Signal (4L80E Only)" and "VSS Reference Low (4L80E Only)." I assume I plug one of these into the Dakota generator and remove the other one from the harness. Is this correct? If so which one do I keep and which one do I delete? Thanks for any help.
Chase
One connector goes to pins 20 and 21 of the C2 connector. There descriptions are "VSS Reference Low" and "VSS Signal." The other connector is wired to pins 22 and 23 of the C2 connector. With descriptions "VSS Signal (4L80E Only)" and "VSS Reference Low (4L80E Only)." I assume I plug one of these into the Dakota generator and remove the other one from the harness. Is this correct? If so which one do I keep and which one do I delete? Thanks for any help.
Chase
01-02-2012, 11:06 PM
#4
Yup, unpin the 22 & 23, reflash for M6 tune because the Computer will recognize the single VSS if it's setup for manual mode. That and the TH400 isnt electronically controlled.
I dont think a segment swap should be needed, but someone else can verify this.
I dont think a segment swap should be needed, but someone else can verify this.
01-02-2012, 11:37 PM
#5
programming a pcm for manual trans with an automatic attached will effect how idle is controlled.
With a manual trans, the PCM makes very slow changes to the idle controller, this is so when you start to let out on the clutch, the idle does not flair up.
On an automatic, the PCM makes fast changes to adjust for the load added by the torque converter when engaging gears.
Keep PCM programmed as automatic, but disable all diagnostics for the electronic trans, and zero out the trans Shift Torque Reduction table so it doesn't retard timing when it ''thinks'' its commanding a shift. That's all that has to be done.
The speed sensor hooks up to pins 20,21. you do not need 22,23 hooked up for th400.
With a manual trans, the PCM makes very slow changes to the idle controller, this is so when you start to let out on the clutch, the idle does not flair up.
On an automatic, the PCM makes fast changes to adjust for the load added by the torque converter when engaging gears.
Keep PCM programmed as automatic, but disable all diagnostics for the electronic trans, and zero out the trans Shift Torque Reduction table so it doesn't retard timing when it ''thinks'' its commanding a shift. That's all that has to be done.
The speed sensor hooks up to pins 20,21. you do not need 22,23 hooked up for th400.
