Hello. Thanks for the donation. Much appreciated
Unfortunately the post SERENA96 was never responded to, after the initial reply. So the outcome of that we cannot tell you !. As your vehicle is already in the shop and they have tried the diagnosis we prescribed it is best left to them to repair. As they are on scene so to speak with the necassary diagnostic tools. Although I have found this TSB which may or may not be of interest to them !. Let me know
REDUCED TRANSAXLE LIMP-IN DEFAULT SENSITIVITY
TECHNICAL SERVICE BULLETIN
Reference Number(s): 21-05-96, 21-05-96 REV. A, Date of Issue: December 27, 1996
Superceded Bulletin(s): 21-05-96, Date of Issue: April 26, 1996
Related Ref Number(s): 21-05-96, 21-05-96 REV. A
REDUCED TRANSAXLE LIMP-IN DEFAULT SENSITIVITY
1996 Chrysler (NS) Town & Country
Bulletin No: 21-05-96 Rev. A
Date: December 27, 1996
NOTE:This bulletin supersedes Technical Service Bulletin number 21-05-96, dated April 26, 1996. Flash software for the NS/GS transaxle without TRS is now available.
NOTE:A supplement (publication no. 81-699-96074) to the 1996 41TE/AE Transaxle and 1996 42LE Transaxle Powertrain Diagnostic Procedures Manuals (publication no.'S 81-699-95014 and 81-699-95015) has been released. The supplement provides improved and additional diagnostic information that covers: Transaxle Diagnostic Trouble Code (DTC) description, Transmission Driveability Problems when no DTC'S are present, and a description of Transmission Operation based on transmission oil sump temperatures.
The diagnostic supplement also applies to all 41TE/AE and 42LE equipped vehicles with the following calibrations:
1989-94 - Updated per TSB 18-24-95 (dated June 23, 1995) 1995-96 - All
NOTE:The repair section of this bulletin provides a software upgrade for the Transmission Control Module (TCM) and should only be used after the appropriate mechanical repair has been completed. This bulletin does not require any parts to be changed. The TCM is not to be replaced for this software improvement, it is to be flash updated only!
The TCM flash update of this bulletin applies to 1996 model year vehicles equipped with a 41TE/AE or 42LE transaxle and WITHOUT the following TCM part numbers:
TCM PART NUMBERS INFORMATION
4686739NS/GS with Transmission Range Sensor (TRS)
4882462NS/GS without TRS
4606271JA/JX with autostick
4606270JA/JX without autostick
4606485LH with autostick
4606284LH without autostick
A new TCM calibration has been released for vehicles built starting in mid-February and is being made available to flash update previous 1996 model year 41TE/AE and 42LE applications. This new calibration will reduce the tendency for the transmission to go into the limp-in mode (2nd gear only in OD, 3 or L, PRNO3L positions) for selected intermittent Diagnostic Trouble Code (DTC) conditions (i.E. TCM DTC's 15, 22, 50, 51, 52, 53, 54, 56, 57 and 58).
Previous calibrations would result in an immediate limp-in mode condition when a DTC was sensed during key "ON", when vehicle speed was below 45 MPH.
This new calibration will always set DTC's as soon as an electrical, mechanical or hydraulic problem is identified but, the transaxle may not go into the limp-in mode until the problem happens several times in a given key start (DTC's 22, 50, 51, 52, 53, 54, 56, 57 or 58) or after several key starts while identifying the DTC in park or neutral before vehicle operation begins (DTC 22). If DTC 24 and/or 37 is set, 1st gear and the Electronically Modulated Converter Clutch (EMCC) will be inhibited and no limp-in mode will occur. In addition this new calibration will eliminate DTC's 23, 25, 26, and 27 which would have been set when trouble with 2 or 3 of the pressure switch circuits existed. The new calibration will set a single fault code for every effected pressure switch circuit instead of one combinational code (23, 25, 26, 27).
After installing this flash update, hard DTC's (DTC's that occur every key start) will still eventually cause a limp-in condition for TCM DTC's 15, 22, 50, 51, 52, 53, 54, 56, 57 and 58, but will take more time and/or key starts than in previous calibrations. Several hard as well as intermittent hardware related DTC's will be tolerated indefinitely and will not illuminate the Malfunction Indicator Light (MIL) and will not allow limp-in mode operation even though the DTC is set in the TCM as soon as the DTC is sensed (i.E. TCM DTC's 21 and 24).
After a subject transaxle has been diagnosed and repaired, perform this flash update Repair Procedure.
NOTE:After this flash update has been installed, it is critical that the TCM and the Powertrain Control Module (PCM) are checked for DTC'S after the vehicle has been test driven because DTC'S could be present even though no physical signs of a problem occurred.
NOTE:The Mopar Diagnostic System (MDS) and DRB III are required to perform this repair and the system must be operating with release 21 or higher and Technical Information Library (TIL) CD release 1123 or higher must be installed.
This bulletin involves reprogramming (flashing) the TCM with new software (calibrations) after the appropriate mechanical repair has been completed.
Connect the MDS and DRB III (Scan Tool) to the vehicle and power them up.
NOTE:For the 1996 model year and future vehicles, the TCM can be reprogrammed from the diagnostic connector. The flash programming kit (CH5500) is NOT needed.
Use the arrow keys on the DRB III and from the MAIN MENU Screen select MDS DIAGNOSTICS.
Use the arrow keys on the MDS and select DIAGNOSTIC MENU from the MDS screen, then press NEXT MENU.
Use the arrow keys on the MDS and select VEHICLE CONTROLLER PROGRAMMING, then press NEXT MENU.
Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS WITH MDS and DRB III on the MDS, then press NEXT MENU.
Follow the steps presented on the MDS and DRB III which will allow the DRB III to obtain the current part number of the PCM.
The MDS will display the description of the updatable PCM and/or TCM on the vehicle and the appropriate replacement part number(s). Select the description of the TCM, then press NEXT MENU to begin programming.
The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
If both the PCM and TCM on the vehicle have already been updated, a NO UPDATES AVAILABLE message will be displayed. If this is the case, verify the Authorized Modification Labels are attached to the TCM and near the Vehicle Emission Control Information (VECI) label. If the labels are not attached, proceed to step 9. Otherwise end the procedure.
NOTE:The following steps are required by federal law.
Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
Type the necessary information on the "Authorized Software Update Label" and attach it to the TCM and cover label with a clear plastic sticker.
POLICY: Reimbursable within the provisions of the warranty.
LABOR OPERATION NO: 08-19-50-91
TIME ALLOWANCE: 0.5 hr.
FAILURE CODE: FM - Flash Module
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Friday, February 27th, 2009 AT 3:31 PM