Grand Caravan FWD V6-181 3.0L SOHC VIN 3 MFI (1997)
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Technical Service Bulletin # 21-02-98A
Date: 980606
A/T - Shudder on 1 - 2/2 - 3 Upshift
NO.: 21-02-98 Rev.A
GROUP: Transmission
DATE: Jun. 26, 1998
SUBJECT:
Diagnostic/Driveability
Improvements, Transaxle
Desensitization To Intermittent
Faults, **1-2 Shudder Fix**
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-02-98, DATED FEB. 13, 1998, WHICH SHOULD BE REMOVED FROM
YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES NEW SOFTWARE TO ADDRESS NS/GS
LIGHT TO MEDIUM 1-2 UPSHIFT SHUDDER ISSUES ALONG WITH ADDITIONAL INFORMATION.
MODELS:
1996 - 1997
(FJ)
Avenger/Sebring/Talon
1996 - 1997
(GS)
Chrysler Voyager (European Market)
1996 - 1997
(JA)
Cirrus/Stratus/Breeze
1996 - 1997
(JX)
Sebring Convertible
1996 - 1997
(LH)
Concorde/Intrepid
1996 - 1997
(NS)
Town & Country/Caravan/Voyager
NOTE:
THIS INFORMATION APPLIES TO VEHICLES WITH A 41TE/AE OR 42LE TRANSAXLE THAT INCORPORATES A TRANSMISSION
RANGE SENSOR (TRS) ONLY.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No:
08-19-50-96
0.5 Hrs.
FAILURE CODE: FM - Flash Module
Discussion
New software has been released to address the following:
**On NS/GS models:**
1.
Reduces a shudder condition that may be experienced during a light to moderate throttle 1-2 upshift with -1 C (30 F) degree fluid temperature or
higher. This condition can be experienced more frequently as the fluid becomes hotter. **Replacement of 2-4 clutch components listed in TSB
21-11-96 Rev. A, should not be required.**
2.
Reduces a shudder condition that may be experienced during a 2-3 upshift just after a 3-2 or 4-2 kick-down.
All models:
1.
Be more tolerant of intermittent conditions that may cause MIL illumination, limp-in or DTC generation. Following is a list of symptom/conditions
made more fault tolerant:
A.
Begins in 2nd gear **(super cold shift schedule)** and does not shift until after a few minutes of driving. Possibly caused by **an
intermittent** thermistor circuit fault.
A thermistor circuit that is in range electrically but falsely showing a temperature that is very cold, or very hot will cause the TCM to use
modified shift schedules based on the temperature (ie. extreme cold - only 2nd gear and reverse, supercold - delayed shifts etc., or overheat -
delayed shifts etc.). **It is important to note that the thermistor, input speed, and output speed sensors share a common ground. Problems in
one circuit may affect the others.**
DTC 74 - CALCULATED TEMPERATURE IN USE may or may not be set. The new software will ignore the thermistor reading if not