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TSB 18-08-00

Erroneous MIL Illumination Due to DTC P0107 -
Map sensor Voltage Too Low

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Date: June 23, 2000

This bulletin supersedes TSB 18-03-99, dated Feb. 19, 1999, which should be removed from your files.

models:   1996-1998 (BR/BE) Ram Truck with Gas engine

1996-1998 (AB)       Ram Van
1996-1998 (AN)      Dakota
1996-1998 (BR/BE) Ram Truck
1998 (DN)               Durango
1996-1998 (TJ)       Wrangler
1996-1 998 (XJ)     Cherokee
1996-1998 (ZJ)       Grand Cherokee

NOTE. THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH GASOLINE ENGINES.

Discussion:

This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration changes 96cal18, 97Cal18 and 98Cal12).  

symptoms:

Erroneous MIL Illumination with DTC $24 (P0107) - MAP SENSOR VOLTAGE TOO LOW. This may occur during downhill decelerations at altitude or when performing off-road maneuvers when the engine is operating over 1500 rpm. The MIL illuminate,; due to the monitor running during incorrect parameters  

diagnosis:

Using the Mopar Diagnostic System (MDS2) and 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 DTC $24 (P0107) is present, the MAP sensor and system tests show no faults, and the customer has described the conditions above, perform the Repair Procedure.  

NOTE: WHENEVER A POWERTRAIN CONTROL MODULE (PCM) IS REPLACED DUE TO FAILURE, THE SOFTWARE OF THE REPLACEMENT CONTROLLER MUST BE VERIFIED FOR THE LATEST REVISION LEVEL. USE THE FLASH PROCEDURE TO UPDATE REPLACED CONTROLLERS AS NECESSARY.

parts:

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

Equipment Required:

NOTE: The MDS2 and DRB III are required to perform part of this repair. When using the MDS2 and DRB III the system must be operating at CIS CD2061 or higher.

repair:

This Procedure involves selectively erasing and reprogramming the ECM with new software.

1.  Log onto the MDS2 system.

2.   Connect the MDS2 and DRB III to the vehicle and switch the ignition key to "ON".

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

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

NOTE: Once MDS2, DRB II, 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. Press the "OK" button.

    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.   The MDS2 and DRB III will prompt for any operator action needed during the remainder of the reprogramming process.

NOTE: DUE TO THE PCM REPROGRAMMING PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (EATX, BCM, MIC, SKIM) WITHIN THE VEHICLE, IF SO EQUIPPED. SOME DTC'S MAY CAUSE THE MIL TO ILLUMINATE. ALL DTC'S RELATE TO A LOSS OF COMMUNICATIONS WITH THE MODULE THAT IS BEING REPROGRAMMED. 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 or print necessary info on the "Authorized Software Update" label PN 04669020 (Fig 1). Attach the label to the PCM, and cover the label with clear plastic overlay.

10. Type or print the following information on the Authorized Modification Label p/n 04275086 and attach the label near the VECI label (Fig 2).

Policy:           Reimbursable within the terms of the warranty.

Time Allowance:
Labor Operation No:     08-19-42-93 ............................. 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