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TSB 18-25-99

Erroneous Engine Miss While Performing Diagnostics With The DRB III

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Date: Nov. 15,1999

Models: 1999 (BR/BE) Ram Truck

1999 (AB) Ram Van
1999 (AN) Dakota
1999 (BR/BE) Ram Truck
1999 (DN) Durango
1999 (TJ) Wrangler
1999 (Xi) Cherokee
1999 (Wi) Grand Cherokee

Overview:

This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration change 99Cal 18, 99Cal 17, or 99Cal 16).

Symptom/Condition:

A Powertrain Control Module (PCM) software condition exists that can cause an erroneous engine miss to occur only when in certain screens of the Diagnostic Scan Tool (DRB lll). The miss will not set a Malfunction Indicator Lamp (MIL), but may be felt and can be seen while performing diagnostics with the DRB lll.

This condition occurs only when using the DRB III to read Diagnostic Trouble Codes (DTC's), Secondary Indicators, or 1 Trip Failures and while driving the vehicle. This is more likely to occur during hard acceleration. While in these screens, a miss may be felt by the technician, or when in the Secondary Indicators or 1 Trip Failures screen an erroneous injector circuit failure can flash on the DRB III screen with an accompany beep from the DRB III.

This condition may lead technicians to incorrectly diagnose a problem and may cause erroneous repairs that will not fix the vehicle.

Parts Required:

1    04669020 Label,   Authorized Software Update
1    04275086 Label,   Authorized Modification

Equipment Required:

1   CH6000              Scan Tool   (DRB III)
1   CH7035             General Purpose Interface Bus Cable (GPIB)
1   CH7000/7001    J1962 Cable
1                             MDS2

NOTE:    THE MDS2 AND DRBIII 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.

Repair:

1.    Log onto the MDS2 system.

2.    Connect the MDS2 (Mopar Diagnostic System) and DRB 1110 (Scan Tool) to the vehicle and switch the ignition key to "ON".

3.    Use the arrow keys and select #2 CONNECT TO MDS1 OR MDS2 on the DRB III MAIN MENU SCREEN.

4.    Use the arrow keys and select #2 RUN MDS2 APPLICATION on the DRB III MAIN MENU SCREEN.  

NOTE:    ONCE MDS2, DFIB III, AND VEHICLE COMMUNICATION HAS BEEN ESTABLISHED, THE "CANNOT READ VIN FROM DRB III" MESSAGE (ON THE MDS) WILL BE REPLACED BY THE VEHICLE VIN. PRESS THE "OK" BUTTON ON THE MDS2 TO REQUEST A MDS2 SESSION FOR THE VEHICLE VIN INDICATED. PRESS THE "OK" BUTTON WHEN ASKED TO BEGIN SESSION.

5.    Push the FLASH tab on the MDS2.

NOTE:    A MESSAGE MAY APPEAR THAT INDICATES NO UPDATES ARE AVAILABLE. IF THIS OCCURS, MAKE SURE YOUR DIAGNOSTIC EQUIPMENT IS OPERATING AT THE LATEST SOFTWARE LEVEL AS LISTED EARLIER IN THIS BULLETIN. IF THE LATEST SOFTWARE IS INSTALLED, AND NO UPDATES ARE AVAILABLE, ANOTHER VEHICLE CONDITION EXISTS THAT WILL REQUIRE FURTHER INVESTIGATION.

6.    Select READ PART NUMBERS FROM VEHICLE and click SHOW UPDATES on the MDS2.

NOTE:    A MESSAGE MAY APPEAR THAT INDICATES NO UPDATES ARE AVAILABLE. IF THIS OCCURS, MAKE SURE YOUR DIAGNOSTIC EQUIPMENT IS OPERATING AT THE LATEST SOFTWARE LEVEL AS LISTED EARLIER IN THIS BULLETIN. IF THE LATEST SOFTWARE IS INSTALLED, AND NO UPDATES ARE AVAILABLE, ANOTHER VEHICLE CONDITION EXISTS THAT WILL REQUIRE FURTHER INVESTIGATION.

7.    Select the new software part number with the light pen and click UPDATE CONTROLLER SOFTWARE.

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

NOTE:    DUE TO THE PCM FLASH PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (EATX, BCM, MIC, SKIM) WITHIN THE VEHICLE IF SO EQUIPPED. SOME MAY CAUSE THE MIL TO ILLUMINATE. ALL DTC'S RELATE TO A LOSS OF COMMUNICATIONS WITH THE MODULE THAT IS BEING FLASHED. CHECK ALL MODULES, RECORD THE FAULTS, AND ERASE THESE FAULTS PRIOR TO RETURNING THE VEHICLE TO THE CUSTOMER. ERASE ANY FAULTS IN THE PCM ONLY AFTER ALL OTHER MODULES HAVE HAD THEIR FAULTS ERASED.

NOTE:    THE FOLLOWING STEPS ARE REQUIRED BY LAW

 
9.    Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Figure 1). Attach the label to the JTEC PCM and cover the label with the clear plastic overlay.

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.

TIMEALLOWANCE:
Labor Operation No: 08-19-43-96 ........................................... 0.5 Hrs.

FAILURE CODE: FM - Flash Module  


Thanks to Bob Bergevin for supplying this TSB information

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This page was edited on: May 3, 2004