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TSB 18-08-99

Improved Speed Control System Sensitivity To Set Speed

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Date: April 30 , 1999

Overview:
This bulletin involves selectively erasing and reprograming the JTEC Powertrain Control Module (PCM) with new software ( calibration changes 98cal12A & 99cal17). There is no change to the Cummins CM551 Engine Control Module (ECM) software.

Models: 1998 - 1999 (BR/BE) Ram Trucks
NOTE: This information applies to vehicles equipped with a 5.9 - 24V diesel engine built before March 23, 1999 (MDH 0323XX).

Symptom/Condition:
Some customers may complain that their vehicle speed control system may be too busy or drift more than 2 mph below or above the initial vehicle set speed. Vehicle load and road / terrain conditions may impact this issue.

The new PCM software improves the speed control system sensitivity so that the vehicle speed remains closer to its set speed with fewer engine rpm oscillations.

Diagnosis:

Using the Mopar Diagnosis System (MDS/MDS2) and or the Diagnosis scan tool (DRBIII) with the appropriate Diagnosis Procedures Manual, verify all engine/ transmission systems are functioning as designed. If Diagnosis 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 symptoms have been experienced, perform the repair procedure.

NOTE:  Whenever a Engine Control Module (ECM) is replaced due to failure, the software of the replacement controller must be verified for the latest revision level. Use the flash procedure to updated replaced controllers as necessary.

Parts Required:

Equipment Required:

NOTE: The MDS1/MDS2 and DRB III are required to perform part of this repair. If using the MDS1 and DRB III the MDS must be operating with release 21 or higher AND TIL CD RELEASE 1132 or higher must be installed. If using the MDS2 and the DRB III the system must be operating at CIS CD2031 or higher.

Repair:
This Procedure involves selectively erasing and reprogramming the ECM with new software.

  MDS 1 PROCEDURE:

  1. Connect the MDS1 and DRB III to the vehicle and power them up.
  2. Use the arrow keys to select #2 CONNECT TO MDS1 OR MDS2 on the DRB III MAIN MENU SCREEN.
  3. Use the arrow keys and select MDS DIAGNOSTICS OR DRB III UPDATE on the DRB III MAIN MENU SCREEN.
  4. Use the arrow keys and select DIAGNOSTIC MENU on the MDS1, then press NEXT MENU.
  5. Use the arrow keys and select VEHICLE CONTROLLER PROGRAMMING on the MDS1, then press NEXT MENU.
  6. Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS USING THE MDS! & DRBIII on the MDS, then press NEXT MENU.
  7. Following the steps presented on the MDS1 and DRB III that will allow the DRB III to obtain the current number of the PCM.
  8. The MDS1 will display the vehicles PCM part number and the replacement part number(s). Press NEXT MENU to begin programming
  9. The MDS1 and DRB III will prompt for any operator action needed during the remainder of the reprogramming process.
10.  Type or print necessary info on the "Authorized Software Update" label PN 04669020 (Fig 1). Attach the label to the JTEC PCM, and cover the label with clear plastic overlay. Do not attach the label to the Cummins CM551 ECM.

11. Type or print the following information on the Authorized Modification Label p/n 04275086 and attach the label near the VECI label (Fig 2).

  MDS2 PROCEDURES:

  1. Log onto the MDS2 system.
  2. Connect the MDS2 and DRB III to the vehicle and switch the ignition key to "ON".
  3. Use the arrow keys to select #2 CONNECT TO MDS1 OR MDS2 on the DRB III MAIN MENU SCREEN.
  4. Use the arrow keys to select #2 RUN MDS2 APPLICATION on the DRB III MAIN MENU SCREEN.
  5. Push the FLASH tab on the MDS2.
  6. Select READ PART NUMBERS FROM VEHICLE and click SHOW UPDATES on the MDS2.
  7. Select the new software part number with the light pen and click UPDATE CONTROLLER SOFTWARE.
  8. The MDS2 and DRB III will prompt for any operator action needed during the remainder of the reprogramming process.
  9. Type or print necessary info on the "Authorized Software Update" label PN 04669020 (Fig 1). Attach the label to the JTEC PCM and cover the label with the clear plastic overlay. Do not attach label to the Cummins CM551 ECM.
  10. Type or print the following information on the "Authorized Modification Label" p/n 04275086 and attach the label near the VECI label (Fig 2).

Policy:           Reimbursable within the terms of the warranty.

Time Allowance:
Labor Operation No:     08-19-42-96 ............................. 0.5 Hrs.  

Failure Code:          FM -- Flash Module


Thanks to Bob Bergevin for supplying this TSB information

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This page was edited on: May 3, 2004