New TCM Calibration TSB (9/10) - Jeep Garage - Jeep Forum

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Old 09-16-2016, 01:29 PM
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[Edit:Not Diesel] New TCM Calibration TSB (9/10)

***EDIT: Nothing to see here folks. This is not for the diesel. (Not sure how to delete a thread???)***

I was just reading this recent TSB for MY2015:

http://www.wk2jeeps.com/tsb/tsb_wk2_2103016.pdf

Quote:
3.0L gas engine (Sales Code EHD)
Improved upshift timing.
Improved torque converter engagement.
Improved shift timing during tow mode operation.
Improved shift points during aggressive driving.
Calibration improvement to correct bump feel during 2-1 downshift.
Improved shift timing while in snow, base, and hill modes.

3.6L gas engine (Sales Code ERB)
Improved 4-3 and 3-2 downshifts.
Improved shift timing at higher altitudes.
Improved shift timing while in sand mode.
Calibration improvement for multi-gear downshift timing during passing maneuvers.
Calibration improvement for intermittent delayed upshift.

5.7L gas engine (Sales Code EZH)
Improved upshift timing in ECO, BASE, and HILL modes and while using cruise.
Improved 8-7, 3-2, and 2-1 downshift timing.
Improved shift timing at higher altitudes.
Improved torque converter engagement.


**In addition, the following software enhancement is available:
Shift quality calibration enhancements to address shift flare and garage shift
complaints.**
I assume that "3.0 Gas engine" actually means the eco diesel?

Has anyone had this done yet? Wondering if the improved upshift timing and torque converter engagement makes for a sportier feel???

Also, any idea about the last comment? What does "is available" mean, and what are "shift flare and garage shift complaints" Something additional that you need to ask for?

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Old 09-16-2016, 01:42 PM
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Re: New TCM Calibration TSB (9/10)

So, for those like me new to the terms "Shift flare" and "Garage Shift":

Garage Shift is when you change gears w/ the shifter. I found an explanation for this from another site. Essentially this fix would be to address if the shift from R->D for example is too "harsh", which I have not experienced:

Quote:
Garage Shifts (as explained by popular mechanics)
The Park or Neutral to Drive shift is called the "garage shift"

From a web search, it appears that controls have been created to reduce the harshness of the garage shift, one description I found is:

"An improved powertrain control minimizes output torque disturbances due to garage shifting. Under certain predefined conditions, garage shifts to the forward or Drive range are carried out by initially commanding a shift to an upper forward gear ratio having a relatively low torque advantage, and then commanding a shift from the upper forward gear ratio to a lower forward ratio that is ordinarily used to launch the vehicle. The shift from the upper gear ratio to the lower gear ratio is initiated when the initial shift is substantially complete or when a predetermined period of time has elapsed since shift initiation. Engine management controls are also used to reduce the transmission input torque during garage shifts to both forward and reverse ranges."

My guess is that when enabled, the garage shift control shifts from park to 4th and then to first gear to reduce the harshness that may be felt under high idle conditions.
Shift Flare

This appears to be when the transmission shifts while accelerating and the RPM briefly increases before settling into the lower RPM that matches the gear. I have not experienced this either...
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Old 09-16-2016, 01:44 PM
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Re: New TCM Calibration TSB (9/10)

No. That is the 3.0 Gas engine and this does not include the EcoDiesel.
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Old 09-16-2016, 09:33 PM
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Re: New TCM Calibration TSB (9/10)

Quote:
Originally Posted by philbytx View Post
No. That is the 3.0 Gas engine and this does not include the EcoDiesel.
There was already another thread that made the same assumption. I'm cross posting for FYI. EcoDiesel sales code is "EXF". When looking at TSB's use only the sales code (and obviously build date, if listed) to see whether it applies to you.
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