TSB 21-04-96

Transmission Will Not Upshift Following Downshift

Visit Geno's Garage for Truck accessories.

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Models: 1996 (BR) Ram Truck

NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE 5.9L CUMMINS DIESEL ONLY.

Symptoms:

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 IS 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:

1   CH6000              Scan Tool   (DRB III)
1   CH7035             General Purpose Interface Bus Cable (GPIB)
1   CH7000/7001    J1962 Cable
1                             MDS2
1    04669020         Label,   Authorized Software Update
1    04275086         Label,   Authorized Modification

Repair: 

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 actually exists and should be corrected.

8. The MDS and DRBIII will prompt the operator for any action needed during the remainder of the programming process.

NOTE: YOU MAY BE REQUIRED TO REPROGRAM THE VIN AND ALL OPTIONS INTO THE UPDATED PCM. THIS WOULD BE THE SAME PROCEDURE THAT YOU WOULD USE IF YOU ARE INSTALLING A NEW PCM.

9.    Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Figure 1). Attach the label to the PCM and cover the label with the clear plastic overlay. Do not attach the label to the JTEC PCM.

10.  Type or print the following information on the Authorized Modification Label and attach the label near the VECI label (Fig 2).

Notes: 

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:
Labor Operation No:  Reprogram Powertrain Control Module
                                  08-19-44-97 ................................... 0.5 Hrs.

Failure Code:  FM - Flash Module