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TSB 18-21-97

Cold Sag/Hesitation

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Date: Dec. 31, 1997

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-22-96 DATED AUG. 23, 1996 WHICH SHOULD BE REMOVED FROM YOUR FILES.

Models: 1999 BR/BE Ram with 3.9L and 5.2L gasoline engines

1994 - 1995 (AB) Ram Van/Wagon
1994 - 1995 (BR) Ram Truck
1994 - 1995 (AN) Dakota

NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 3.9L OR 5.2L ENGINE AND AN AUTOMATIC TRANSMISSION.

Symptom/Condition:

The engine may spark knock when warm under moderate to heavy acceleration.

Diagnosis:

Using the Mopar Diagnostic System (MDS) 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 or those listed above are present and any of the above symptoms have been experienced, perform the Repair Procedure.

Equipment/Parts Needed:

Repair:

This Procedure involves selectively erasing and reprogramming the PCM with new software (calibration changes).

NOTE: THE MDS AND DRB III ARE REQUIRED TO PERFORM PART OF THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 21 OR HIGHER AND TIL CD RELEASE 1133 OR HIGHER MUST BE INSTALLED.

1.    Connect the MDS (Mopar Diagnostic System) and DRS III (Scan Tool) to the vehicle and power them up.

2.    Use the arrow keys and select #2 MDS DIAGNOSTICS on the DRB III 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 VEHICLE CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.

5.    Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS USING MDS & DRB III on the MDS, then press NEXT MENU,

6.    Follow the steps presented on the MDS and DRS III which will allow the DRB III 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.

NOTE: SOME VEHICLES BUILT IN 1994 DO NOT HAVE PROGRAMMABLE POWERTRAIN CONTROL MODULES (PCM). REPLACEMENT PCMS DO CONTAIN THE ABILITY TO BE REPROGRAMMED. IF MDS RESPONDS WITH A MESSAGE "THIS CONTROLLER CANNOT BE PROGRAMED", REPLACE THE PCM AND PERFORM ALL UPDATES TO THE PCM BY PERFORMING THE INSTRUCTIONS ON THIS TSB. IF THE REPLACEMENT PCM HAS THE LATEST SOFTWARE CHANGES, A "NO UPDATES AVAILABLE" MESSAGE WILL BE DISPLAYED.

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 DRB III will prompt for any operator action needed during the remainder of the programming process.

NOTE: THE FOLLOWING STEPS ARE REQUIRED BY LAW

9.    Type or print necessary info on the "Authorized Software Update" label (Fig 1) and attach it to the ECM. Cover the label with clear tape.

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 PCM 08-19-45-94 ....................... 0.5 Hrs.

                                   Replace and Reprogram PCM 08-19-45-94 ... 0.7 Hrs.

FAILURE CODE: FM - Flash Module


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004