3.7L V6 QT1 to QT2 Conversion.

[Sal-XK]

I think you nailed it man awesome work!

[cmdr jim]

I think you nailed it man awesome work!

It does look like it's working, I just need to test some more to see what is happening with the codes in Low. I can tolerate error codes when in Low, as long as it doesn't adversely affect anything else.

I think this is what is taking place when I shift to Low or Low Lock:

First it is going into Permanent Limp-In Mode
"If this occurs while the vehicle is moving, the transmission
remains in the current gear position until the ignition is turned off or the shifter is placed in the "P" position. When
the shifter has been placed in "P" the transmission only allows 2nd gear operation. If this occurs while the vehicle
is not moving, the transmission only allows operation in 2nd gear."

And once I shift the transfercase back into high it goes into Temporary Limp-In Mode
"This mode is the same as the permanent Limp-In Mode except if the condition is no longer present, the system resumes normal operation."

Which would explain why after I receive the "Check Engine Light" and shift the transfercase back to high the transmission operates correctly. By going out of Low and back into High, I've "fixed" the condition that put the TCM into Permanent Limp-In Mode, and placed it into Temporary Limp-In Mode.

Question, how long does the error code stay in the TCM, but operate correctly before the code disappears or does it need to be reset by disconnecting the battery?

[LWM]

Question, how long does the error code stay in the TCM, but operate correctly before the code disappears or does it need to be reset by disconnecting the battery?

In most cases it takes three starts of the motor to clear codes as long as the problem has also been corrected (you cannot just start it and turn it off, you must drive between starts).

[cmdr jim]

In most cases it takes three starts of the motor to clear codes as long as the problem has also been corrected (you cannot just start it and turn it off, you must drive between starts).

Just confirming, that appears right. The "Check Engine Light" is off, keep in mind there were never any shifting problems in "High" during the error.

[cmdr jim]

I think I have come up with a way to eliminate the Low Lock error code completely. It would require another wheel sensor and 4 relays. Spot welding equally spaced targets on the rear driveshaft flange up by the transfercase, and mount the wheel speed sensor to the transfercase to read these targets. Then when in Low or Low Lock switch on the relays with my program to read this wheel sensor, instead of the actual wheel sensors.

[07JeepXK]

Good luck with that. lol thats way beyond my knowledge!