RAM 2500 Truck 4WD V8-5.9L VIN Z (1997)

Control Module: Customer Interest
TCM - MIL ON/DTC P1763 Set
NUMBER: 21-04-00
GROUP: Transmission
DATE: June 3O, 2000
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-07-99, DATED APRIL 30, 1999, WHICH SHOULD BE REMOVED
FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE REVISED MODEL YEARS.
SUBJECT:
Erroneous MIL Illumination For P1763 - Trans. Governor Pressure Sensor Volts Too High
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration change
96Cal18, 97Cal18, 98Cal12, and 99Cal14).
MODELS:
**1996** - 1999
(AB)
Ram Van
**1996** - 1999
(AN)
Dakota
**1996** - 1999
(BR/BE)
Ram Truck
1998 - 1999
(DN)
Durango
**1997** - 1999
(TJ)
Wrangler
**1996** 1999
(XJ)
Cherokee
**1996** - 1998
(ZJ)
Grand Cherokee
NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH AN RE SERIES AUTOMATIC TRANSMISSION BUILT BEFORE
DECEMBER 18, 1998 (MDH 1218XX).
SYMPTOM/CONDITION:
Some vehicles may exhibit a MIL illumination with a Diagnostic Trouble Code (DTC) of P1763 - Transmission Governor Pressure Sensor Volts Too
High. The vehicle operator may experience slower than normal vehicle accelerations because the transmission may have temporarily entered its third
gear "Limp-In" mode as a result of the DTC. The "Limp-In" mode may last until the vehicle owner cycles the ignition key. The technician may not detect
a problem with the automatic transmission during a diagnostic test or test drive.
The MIL is caused by an increase in hydraulic pressure. The increased hydraulic pressure is the result of a new valve body machining process, which
entered into production January 1, 1998. This condition will occur most often with vehicles that were built between January 1, 1998 and December 18,
1998.
Vehicles built prior to January 1,1998 may also experience this condition if the valve body or the transmission assembly is replaced with components
built after January 1, 1998.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS2) and or the Diagnostic Scan Tool (DRB III(R)), with the appropriate Diagnostic Procedures Manual, verify
that all engine and transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order
and repair as necessary before proceeding further with this bulletin. If no DTC's are present, and the above symptom has been experienced, perform the
Repair Procedure.
NOTE:
WHENEVER A POWERTRAIN (PCM) IS REPLACED DUE TO FAILURE, THE SOFTWARE OF THE REPLACEMENT CONTROLLER
MUST BE VERIFIED FOR THE LATEST REVISION LEVEL. USE THE FLASH PROCEDURE TO UPDATE REPLACED CONTROLLERS
AS NECESSARY.
PARTS REQUIRED:
1
04669020
Label, Authorized Software Update
1
04275086
Label, Authorized Modification
EQUIPMENT REQUIRED:
1
CH6000
Scan Tool (DRB III(R))
1
CH7035
General Purpose Interface Bus Cable (GPIB)