PCM - Momentary Engine Stumble: Overview

NUMBER: 18-24-99

GROUP: Vehicle Performance

EFFECTIVE DATE: Nov. 15, 1999

SUBJECT:
5.9L-24V Diesel Engine Intermittent Engine Stumble.

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Cummins CM551 Engine Control Module (ECM) with new software (calibration change 99CalT9A). There is no change to the JTEC PCM software.

MODELS:
2000 (BR/BE) Ram Truck

NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH A 5.9L-24V DIESEL ENGINE BUILT BEFORE ENGINE SERIAL NUMBER 56624822 WITH A DATE OF MANUFACTURE OF AUGUST 28, 1999. THIS INFORMATION IS AVAILABLE ON THE ENGINE DATA PLATE, WHICH IS LOCATED ON THE LEFT SIDE OF THE ENGINE, AFFIXED TO THE GEAR HOUSING.

SYMPTOM/CONDITION:
The customer may experience a quick, momentary stumble while driving or when stopped with the engine running. This condition is intermittent and may occur at any time during the operation of the vehicle.

A change to the Cummins CM551 Engine Control Module (ECM) software corrects this condition.

DIAGNOSIS:
Using the Mopar Diagnostic System (MDS2) and or the Diagnostic Scan Tool (DRB III) 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 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 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)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7OOO/7001 J1962 Cable
1 MDS2

NOTE:
THE MDS2 AND DRB III ARE REQUIRED TO PERFORM PART OF THIS REPAIR. WHEN USING THE MDS2 AND THE DRB III, THE SYSTEM MUST BE OPERATING AT CIS CD 2045 OR HIGHER.

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation No: 08-19-43-95 0.5 Hrs.

FAILURE CODE: FM - Flash Module