RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 6 (1998)
Technical Service Bulletin # 18-08-99
Date: 990430
PCM - Cruise Control Malfunctions
Number: 18-08-99
Group: Vehicle Performance
Date: April 30, 1999
SUBJECT:
Improved Speed Control System Sensitivity To Set Speed.
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration changes
98CaI12A, 99CaI17). There is no change to the Cummins CM551 Engine Control Module (ECM) software.
MODELS:
1998 - 1999 (BR/BE) Ram Truck
NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH A 5.9L - 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 I 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 Diagnostic System (MDS/MDS2) and or the Diagnostic Scan Tool (DRB Ill®) with the appropriate Diagnostic Procedures Manual,
verify all engine/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 symptoms have been experienced, perform the
Repair Procedure.
NOTE:
WHENEVER A POWERTRAIN CONTROL MODULE (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
CH6OOO
Scan Tool (DRB III(R))
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7OOO/7001
J1962 Cable
1
MDS1 or MDS2
NOTE:
THE MDS1IMDS2 AND DRB III(R) ARE REQUIRED TO PERFORM PART OF THIS REPAIR. IF USING THE MDS1 AND DRB III(R). THE
MDS MUST BE OPERATING AT RELEASE 21 OR HIGHER AND TIL CD RELEASE 1132 OR HIGHER MUST BE INSTALLED. IF USING
THE MDS2 AND THE DRB III(R) THE SYSTEM MUST BE OPERATING AT CIS CD2031 OR HIGHER.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No:
08-19-42-96
0.5 Hrs.
FAILURE CODE: FM - Flash Module
MDS1 Procedure