3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
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PROM - Programmable Read Only Memory: Customer Interest
A/T, PCM - No Upshift Following a 3-2 Downshift
NO: 21-04-96
GROUP: Transmissions
DATE: Mar. 15, 1996
SUBJECT:
Transmission Will Not Upshift Following a 3-2 Downshift
MODELS:
1996 (BR) Ram Truck
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE 5.9L CUMMINS DIESEL ONLY.
SYMPTOM/CONDITION:
Under certain driving conditions (ie. OD OFF and accelerating or climbing a hill) the transmission may not upshift following a 3-2 downshift. In this
condition, the engine will continue to operate at maximum governor speed in second gear, until the throttle is reduced (lift-foot shift).
NOTE:
THIS CONDITION WILL ONLY OCCUR WHILE THE TRANSMISSION'S OVERDRIVE 15 DISENGAGED (OD OFF LIGHT
ILLUMINATED) AND AT FULL THROTTLE.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBIII) and appropriate Diagnostic Procedure Manual, verify that all engine systems are
functioning correctly. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair before proceeding
with this bulletin. If any of the above conditions exist, perform the Repair Procedure.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRBIII)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7000
J1962 Cable
1
4669020
Label - Authorized Software Update
1
4275086
Label - Authorized Modification
REPAIR PROCEDURE:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration change).
NOTE:
MDS AND DRBIII ARE REQUIRED TO PERFORM THE FOLLOWING REPAIR. MDS MUST BE OPERATING WITH RELEASE 19 OR
HIGHER AND TIL 1100 OR HIGHER INSTALLED.
1.
Connect the MDS and DRBIII to the vehicle and power them up.
2.
Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRBIII MAIN MENU Screen.
3.
Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4.
Use the arrow keys and select CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5.
Use the arrow keys and select PROGRAM VEHICLE CONTROLLER on the MDS, then press NEXT MENU.
6.
Follow the steps presented on the MDS and DRBIII which will allow the DRBIII to obtain the current part number of the PCM.
7.
The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin
programming.
If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part
number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then a system problem