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Article No. 96-03-18	HARD START OR NO START - 7.3L DI TURBO - 1994-95 CALIBRATION HESITATION - 7.3L DI TURBO - 1994-95 CALIBRATION IDLE - ROUGH - 7.3L DI TURBO - 1994-95 CALIBRATION LOW POWER - 7.3L DI TURBO - 1994-95 CALIBRATION MISSES - 7.3L DI TURBO 1994-95 CALIBRATION STALLS - 7.3L ID TURBO 1994-95 CALIBRATION
Publication Date: JANUARY 29, 1996

This TSB article is being republished in its entirety to update vehicle models and years.

CALIBRATION:

5-89K-R00, 5-90A-R00, 5-90B-R00

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:

Some 1994 and 1995 7.3L DIT Turbo Diesels may have diagnostic difficulties or rough idle and performance concerns.  These difficulties or concerns relate to:

• Hard or no start
• Stalls
• Hesitation
• Misses
• Low Power

This is due to the limited diagnostics of the 1994 calibration and the diagnostic procedures.

ACTION:

For customer concern vehicles only, reprogram the Powertrain Control Module (PCM) to 1996 level calibration to provide improved diagnostic capability and performance.  Refer to the following Service Procedure for details.

NOTE:

DO NOT REPROGRAM EITHER 1994 SELECTIVE RPM CONTROL VEHICLES OR RYDER, INC. UNIQUE CALIBRATION VEHICLES.  USE THE SUPER STAR II TESTER TO DIAGNOSE THESE VEHICLES.

Updating the calibration will allow the use of New Generation Star (NGS) tester and improved diagnostic procedures in diagnosing the vehicle.  This will also slightly improve idle quality and performance.

SERVICE PROCEDURE

1. Before servicing the vehicle, check for an Authorized Modifications Decal (FPS 8262) on the fan shroud.  Vehicles which have already been reprogrammed should display a decal.
2. Connect Service Bay Diagnostic System (SBDS) to the J-1962 On-Board Diagnostics (OBD) II Data Link Connector which is located under the instrument panel below the glove compartment area.
3. Reprogram the 1994 and 1995 Electronic Engine Control (EEC) module to 1996 level using the February, 1996 or later update CD-ROM and SBDS.  Follow the directions and displays on the SBDS screen.
4. After reprogramming is complete, an Authorized Modifications Decal (FPS 8262) must be installed on the fan shroud.  The decal must be completely filled out with the updated calibration information provided on the SBDS display screen.
5. Diagnostics must now be performed using the NGS scan tool and the 1996 Powertrain Control/Emissions Diagnosis (PC/ED) Manual diagnostic procedures.
6. Use the OBD II Data Link Connector located under the instrument panel for NGS and SBS hook-up.
7. Select appropriate 1996 Service Manual on NGS scan tool to obtain correct Self-Test Modes and Parameter Identification (PID) menu.

   Obtain an Authorized Modifications Decal 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.
   
   
   
   

   In the future, if a 1994 or 1995 PCM requires replacing due to failure, the 1996 model year PCM should be ordered.  Refer to the following Parts Block for correct part numbers.

OTHER APPLICABLE ARTICLES:

NONE

SUPERSEDES:

95-11-09

WARRANTY STATUS:

Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

DEALER CODING

OASIS CODES:

602300, 603300, 607000, 607400, 608000, 608400, 609000, 609400, 611000, 611500, 614000, 614500, 614600