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TSB 18-38-98

Intermittent Poor Driveability During Steady State (Highway) Driving

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Date: Dec 18, 1998

Models: 1999 BR/BE Ram with California Emission V10 engines  (Sales Code NAE)
                  built prior to Dec 18, 1998 (MDH 1218XX)

1999 (AN) Dakota 5.9 with federal emissions (sales code NAA) built prior to Dec 18, 1998 (MDH 1218XX)

Symptom/Condition:

Some vehicles may exhibit intermittent poor drivability during steady highway driving.  This may feel like a surge or lack of performance. This may be caused when the ODBII CARB Readiness Catalyst Monitor runs.

Diagnosis:

Using the Mopar Diagnostic System (MDS/MDS2)  or the Diagnostic Scan Tool (DRB III), verify that all engine/transmission systems are functioning as designed. If other DTC's are present, repair as necessary before proceeding with this bulletin.

A helper must monitor the DRB III as the vehicle is operated and the OBD II CARB Readiness Catalyst Monitor runs.  If the vehicle exhibits poor performance perform the repair procedure.

NOTE:  Whenever a PCM is replaced due to failure, the software of the replacement controller should be verified for the latest revision level. Use the flash procedure to updated replaced controllers as necessary.

Repair:

This Procedure involves selectively erasing and reprogramming the PCM with new software (99cal14 calibration change).

NOTE: The Mopar Diagnostic System is required to perform the ECM flash. The system must be operating with release 21 or higher AND TIL CD RELEASE 1175 or higher must be installed.
 
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.
 
Type or print the following information on the Authorized Modification Label and attach the label near the VECI label (Fig 2).
 


Thanks to Bob Bergevin for providing this TSB information

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This page was edited on: May 3, 2004