>From the FSM (98 - pg 14-37, 99 - pg 14-36)
Used in automatics only (Well DUH).
Temp data is used for TC Clutch operation, overdrive shift, low temp shift
compensation, WOT shift stategy, and governor pressure transducer
calibration.
Futhermore 2000 FSM pg 21-440 adds:
shift strategy is also determined based on this sensors output. In the case
of a failure, trans temp is calced from a combination of Battery temp
sensor, Engine coolant temp, and in gear runtime since startup.
The temp range stuff I got from the 5* tech when my temp sensor failed.
Basically there are 3 shift strategies, cold, inbetween, and normal range.
If over temp is achieved (or percieved due to a bad sensor), OD and lockup
are disabled. Replacement of this sensor and internal solenoids gets rather
pricey as well. Been there done that on my 99 R/T with 46RE.
Tony
-----Original Message-----
From: Rick Barnes <barnesrv@comcast.net>
To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
Date: Friday, January 16, 2004 10:39 AM
Subject: DML: RE: Re: Transmission Shifting in Sub Zero Temps
>
>Man, I love the DML, learn something every day! I would never have known
>that...
>
>Rascal
>
>-----Original Message-----
>From: owner-dakota-truck@bent.twistedbits.net
>[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Tony Cellana
>Sent: Friday, January 16, 2004 10:09 AM
>To: dakota-truck@dakota-truck.net
>Subject: DML: Re: Transmission Shifting in Sub Zero Temps
>
>
>Trans shifting is based on TRANS temp not engine temp. There is a temp
>sensor IN the tranny that controls shift patterns. I beleive there are 4
>ranges. up to 32*F, 32 to 65 (or so) and over 65 to overheat point, and
>overheat and above.
>
>If the trans is below the low limit, or above the high limit, overdrive is
>disabled.
>
>TonyC
>
>-----Original Message-----
>From: david.clement@verizon.net <david.clement@verizon.net>
>To: dakota-truck-moderator@bent.twistedbits.net
><dakota-truck-moderator@bent.twistedbits.net>
>Date: Friday, January 16, 2004 8:06 AM
>Subject: DML: Transmission Shifting in Sub Zero Temps
>
>
>>
>>We had the coldest morning (-7 F) in my recollection in the Boston area
>today.
>>I know the tranny does not shift into 4th until it is up to temperature.
In
>my
>>14 years of owning Dakotas that has never been more than a mile or two of
>>driving, but it's never been this cold either. Today I drove my entire 14
>mile
>>commute to work without it shifting to 4th, shifting between 1-3 was
>normal.
>>
>>My question for those that regularly see sub zero temps is it
common/normal
>for
>>it to not shift into 4th on a drive of that length? My engine temp was up
>to
>>the normal point on the gauge within 3 miles of the house.
>>
>>Dave Clement
>>89 SLT+ CC 4x4
>>
>
>
This archive was generated by hypermail 2b29 : Sun Feb 01 2004 - 16:29:50 EST