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Article No. 98-04-14	STALL - DURING LONG DECEL CONDITIONS WHILE IN MANUAL 1 OR MANUAL 2 GEAR - VEHICLES EQUIPPED WITH E4OD TRANSMISSION AND CALIFORNIA CALIBRATION 7.3L DIT ENGINE
Publication Date: MARCH 2, 1998

This TSB article is being republished in its entirety to correct the "New Calibrations" listed in the PCM Calibration Reference Chart.

CALIBRATION:

7-90P-R10, 7-90P-R11

WARNING:

THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE.  PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.

ISSUE:

An engine stall condition may occur on some 1997 California F-Series 7.3L Diesel E4OD vehicles after a long decel when using M1 gear for engine braking.  When upshifting after the decel, the engine may stall if it is at approximately 1000 rpms (10 mph).  This may be caused by the Powertrain Control Module (PCM) calibration.

ACTION:

Reprogram the PCM.  The revised calibration modifies the fuel control governor to reduce the possibility of stall.  Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Perform normal diagnostics as outlined in the 1997 Powertrain Control/Emissions Diagnosis (PC/ED) On-Board Diagnostics II (OBD-II) Service Manual and service as required.
2. If the concern still exists, reprogram the PCM using the latest level CD-ROM and Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester.  Refer to the following PCM Calibration Reference Chart for the correct calibration.
   
   

   PCM CALIBRATION REFERENCE
   Old Calibration	Old Part Number (-12A650-)	New Calibration	New Part Number (-12A650-)
   7-90P-R10/11	F7TZ-RD/RE	7-90P-R12	F7TZ-RF

   
   

   NOTE:

   PCM REPLACEMENT IS NOT AUTHORIZED BY THIS TSB.  REFER TO THE POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS (PC/ED) SERVICE MANUAL FOR APPROPRIATE DIAGNOSTIC PROCEDURES IF PCM HARDWARE CONCERNS EXIST.

   Obtain an Authorized Modifications Decal (FPS 8262 - orderable through DOES II, 25/pkg) and list the date, dealer number, and summary of alterations performed.  Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal.  Clean the area, install the decal, and cover it with a clear plastic decal shield.
   
   
   
   

OTHER APPLICABLE ARTICLES:

NONE

SUPERSEDES:

98-01-19

WARRANTY STATUS:

Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

DEALER CODING

OASIS CODES:

607000, 607700